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Chevrolet Heater Control Valve

17 items

Keep your vehicle's heater control valve working properly with A-Premium's reliable options. Trust our high-quality parts for the best performance.

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HVAC Heater Control Valve for Dodge Grand Caravan Charger Dart Chevy Camaro GMCHVAC Heater Control Valve for Dodge Grand Caravan Charger Dart Chevy Camaro GMC
A-Premium®Part # APHCV031
HVAC Heater Control Valve for Dodge Grand Caravan Charger Dart Chevy Camaro GMC
4.818 Reviews
$21.99
Low stock: Only 1 left
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2-year warranty
90 days free return
Fits 1987 - 1987 Chevrolet Camaro, 1988 - 1988 Chevrolet Caprice, 2003 - 2010 Chevrolet Express 1500, 2003 - 2010 Chevrolet Express 2500, 2003 - 2010 Chevrolet Express 3500, 2009 - 2010 Chevrolet Express 4500, 2009 - 2010 Chevrolet Express Cargo, 2009 - 2010 Chevrolet Express Pasajeros, 1990 - 1991 Chrysler Daytona, 1981 - 1983 Chrysler Imperial, 1990 - 1990 Chrysler Imperial, 1980 - 1980 Chrysler LeBaron, 1981 - 1981 Chrysler LeBaron, 1982 - 1982 Chrysler LeBaron, 1984 - 1984 Chrysler LeBaron, 1985 - 1985 Chrysler LeBaron, 1990 - 1990 Chrysler LeBaron, 1979 - 1979 Chrysler New Yorker, 1982 - 1982 Chrysler New Yorker, 1984 - 1984 Chrysler New Yorker
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Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10015Q35
Note
This item comes with 2 Ports.
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A-Premium APHCV098 HVAC Heater Control Valve
A-Premium®Part # APHCV098
A-Premium APHCV098 HVAC Heater Control Valve
4.818 Reviews
$25.99
Low stock: Only 1 left
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2-year warranty
90 days free return
Fits 1977 - 1979 Buick Century, 1981 - 1981 Buick Century, 1977 - 1977 Buick Century, 1985 - 1985 Buick Electra, 1985 - 1987 Buick Electra, 1985 - 1990 Buick Electra, 1981 - 1981 Buick Electra, 1982 - 1984 Buick Electra, 1984 - 1985 Buick Electra, 1986 - 1989 Buick Electra, 1977 - 1980 Buick Electra, 1980 - 1980 Buick Electra, 1980 - 1981 Buick Electra, 1981 - 1981 Buick Electra, 1982 - 1982 Buick Electra, 1985 - 1985 Buick Electra, 1977 - 1979 Buick Electra, 1981 - 1981 Buick Estate Wagon, 1977 - 1980 Buick Estate Wagon, 1977 - 1979 Buick Estate Wagon
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
ConditionNew
item #1005UP35
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HVAC Heater Control Valve for Chevy C10 Suburban GMC K1000
A-Premium®Part # APHCV102
HVAC Heater Control Valve for Chevy C10 Suburban GMC K1000
4.818 Reviews
$24.99
Low stock: Only 1 left
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2-year warranty
90 days free return
Fits 1961 - 1967 Chevrolet C10 Panel, 1961 - 1967 Chevrolet C10 Pickup, 1967 - 1967 Chevrolet C10 Suburban, 1967 - 1967 Chevrolet C20 Panel, 1961 - 1967 Chevrolet C20 Pickup, 1967 - 1967 Chevrolet C20 Suburban, 1961 - 1966 Chevrolet C30 Panel, 1961 - 1967 Chevrolet C30 Pickup, 1946 - 1946 Chevrolet CK, 1961 - 1967 Chevrolet K10 Pickup, 1967 - 1967 Chevrolet K10 Suburban, 1967 - 1967 Chevrolet K20 Panel, 1961 - 1967 Chevrolet K20 Pickup, 1967 - 1967 Chevrolet K20 Suburban, 1953 - 1957 Chevrolet One-Fifty Series, 1961 - 1966 Chevrolet Suburban, 1942 - 1959 Chevrolet Truck, 1953 - 1957 Chevrolet Two-Ten Series, 1953 - 1959 GMC 100, 1953 - 1959 GMC 150
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Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
item #10013LA0
Note
Manual Shut-off Valve with 0.75 inch Diameter Hose.
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HVAC Heater Control Valve for Chevy Malibu Corvette Ford Mustang Buick	 Pontiac
A-Premium®Part # APHCV029
HVAC Heater Control Valve for Chevy Malibu Corvette Ford Mustang Buick Pontiac
4.818 Reviews
$23.99
Low stock: Only 1 left
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2-year warranty
90 days free return
Fits 1975 - 1975 Buick Century, 1980 - 1981 Buick Century, 1980 - 1980 Buick Century, 1973 - 1975 Buick Century, 1973 - 1974 Buick Century, 1978 - 1979 Buick Electra, 1971 - 1974 Buick Electra, 1973 - 1973 Buick Electra, 1975 - 1975 Buick Electra, 1973 - 1973 Buick Estate Wagon, 1971 - 1975 Buick Estate Wagon, 1977 - 1977 Buick LeSabre, 1980 - 1980 Buick LeSabre, 1971 - 1972 Buick LeSabre, 1971 - 1974 Buick LeSabre, 1971 - 1975 Buick LeSabre, 1974 - 1975 Buick LeSabre, 1975 - 1975 Buick LeSabre, 1971 - 1972 Buick LeSabre, 1971 - 1974 Buick LeSabre
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10015RKC
Note
This item comes with Push In Port.
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ÜRO Parts 90566947 HVAC Heater Control Valve
ÜRO PartsPart # 90566947
ÜRO Parts 90566947 HVAC Heater Control Valve
4.630 Reviews
$33.99
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3-year warranty
90 days free return
Fits 1997-2001 Cadillac Catera, 1996-1999 Chevrolet Chevy, 2001-2001 Chevrolet Chevy, 2002-2002 Chevrolet Corsa, 2004-2012 Chevrolet Chevy, 1999-2009 Saab 9-5
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Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPA6
Part interchange
90566947, 32101268, 90566947, 5048830, 902-809, URO-004088
item #1000ZGLE
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HVAC Heater Control Valve for Chevy Impala Camaro C10 Suburban GMC Jimmy Pontiac
A-Premium®Part # APHCV043
HVAC Heater Control Valve for Chevy Impala Camaro C10 Suburban GMC Jimmy Pontiac
4.818 Reviews
$31.99
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2-year warranty
90 days free return
Fits 1977 - 1978 Cadillac Eldorado, 1979 - 1979 Cadillac Eldorado, 1977 - 1979 Cadillac Seville, 1970 - 1972 Chevrolet Blazer, 1970 - 1972 Chevrolet C10 Pickup, 1970 - 1972 Chevrolet C10 Suburban, 1970 - 1972 Chevrolet C20 Pickup, 1970 - 1972 Chevrolet C20 Suburban, 1970 - 1972 Chevrolet C30 Pickup, 1969 - 1970 Chevrolet Camaro, 1969 - 1970 Chevrolet Caprice, 1969 - 1970 Chevrolet Chevelle, 1969 - 1970 Chevrolet Corvette, 1979 - 1981 Chevrolet Corvette, 1969 - 1970 Chevrolet El Camino, 1969 - 1970 Chevrolet Impala, 1970 - 1972 Chevrolet K10 Pickup, 1970 - 1972 Chevrolet K10 Suburban, 1970 - 1972 Chevrolet K20 Pickup, 1970 - 1972 Chevrolet K20 Suburban
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
Part interchange
74610, 14020087, 14029987, 3940250, 3949878, 3984250, 3984623, 39846242
item #10015LRA
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HVAC Heater Control Valve for Chevy Impala Malibu Dodge Dakota Buick Cadillac
A-Premium®Part # APHCV044
HVAC Heater Control Valve for Chevy Impala Malibu Dodge Dakota Buick Cadillac
4.818 Reviews
$17.99
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2-year warranty
90 days free return
Fits 1976 - 1976 AMC Hornet, 1973 - 1973 AMC Matador, 1979 - 1979 AMC Spirit, 1980 - 1981 Buick Century, 1977 - 1979 Buick Electra, 1982 - 1982 Buick Electra, 1979 - 1979 Buick Estate Wagon, 1976 - 1976 Buick LeSabre, 1979 - 1980 Buick Regal, 1983 - 1983 Buick Regal, 1985 - 1987 Buick Regal, 1982 - 1982 Buick Riviera, 1984 - 1984 Buick Riviera, 1980 - 1984 Cadillac DeVille, 1979 - 1980 Cadillac Eldorado, 1982 - 1985 Cadillac Eldorado, 1980 - 1980 Cadillac Fleetwood, 1983 - 1984 Cadillac Fleetwood, 1980 - 1981 Cadillac Seville, 1983 - 1985 Cadillac Seville
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10013NXW
Note
This item comes with 2 Ports (5/8 in x 5/8 in port sizes), without Threads.
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HVAC Heater Control Valve for Chevy Silverado 1500 Suburban 1500 Tahoe Cadillac
A-Premium®Part # APHCV055
HVAC Heater Control Valve for Chevy Silverado 1500 Suburban 1500 Tahoe Cadillac
4.818 Reviews
$28.99
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2-year warranty
90 days free return
Fits 1999 - 2000 Cadillac Escalade, 1995 - 1995 Chevrolet C1500, 1996 - 1999 Chevrolet C1500, 1995 - 1999 Chevrolet C1500 Suburban, 1995 - 1995 Chevrolet C2500, 1996 - 2000 Chevrolet C2500, 1995 - 1999 Chevrolet C2500 Suburban, 1995 - 1995 Chevrolet C3500, 1996 - 2000 Chevrolet C3500, 1995 - 1995 Chevrolet C3500HD, 1996 - 2000 Chevrolet C3500HD, 1997 - 2012 Chevrolet Express 1500, 1997 - 2010 Chevrolet Express 2500, 2011 - 2012 Chevrolet Express 2500, 2011 - 2019 Chevrolet Express 2500, 1997 - 2010 Chevrolet Express 3500, 2011 - 2012 Chevrolet Express 3500, 2011 - 2019 Chevrolet Express 3500, 2010 - 2015 Chevrolet Express 4500, 2016 - 2016 Chevrolet Express 4500
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10015R8A
Note
This item comes with 4 Ports.
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HVAC Heater Control Valve for Chevy Malibu Impala Camaro Corvette GMC Buick Olds
A-Premium®Part # APHCV042
HVAC Heater Control Valve for Chevy Malibu Impala Camaro Corvette GMC Buick Olds
4.818 Reviews
$34.99
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2-year warranty
90 days free return
Fits 1981 - 1981 Buick Century, 1977 - 1977 Buick Century, 1978 - 1978 Buick Century, 1979 - 1980 Buick Century, 1977 - 1979 Buick Century, 1977 - 1980 Buick Electra, 1980 - 1980 Buick Electra, 1977 - 1979 Buick Electra, 1977 - 1980 Buick Estate Wagon, 1978 - 1978 Buick LeSabre, 1977 - 1980 Buick LeSabre, 1977 - 1978 Buick LeSabre, 1981 - 1981 Buick Regal, 1977 - 1977 Buick Regal, 1978 - 1978 Buick Regal, 1979 - 1980 Buick Regal, 1977 - 1977 Buick Regal, 1977 - 1979 Buick Riviera, 1977 - 1978 Buick Riviera, 1971 - 1972 Chevrolet Camaro
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
item #10013L0E
Note
This item comes with 2 Outlets, Right Angle Hose Connection and 1 End Threaded.
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HVAC Heater Control Valve for Chevy Express 1500 2500 P20 G1500 GMC Savana 1500
A-Premium®Part # APHCV056
HVAC Heater Control Valve for Chevy Express 1500 2500 P20 G1500 GMC Savana 1500
4.818 Reviews
$19.99
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2-year warranty
90 days free return
Fits 1996 - 1996 Chevrolet Express 1500, 1996 - 1996 Chevrolet Express 2500, 1996 - 1996 Chevrolet Express 3500, 1990 - 1993 Chevrolet G10, 1994 - 1995 Chevrolet G10, 1990 - 1993 Chevrolet G20, 1994 - 1995 Chevrolet G20, 1990 - 1993 Chevrolet G30, 1994 - 1996 Chevrolet G30, 1988 - 1989 Chevrolet P20, 1988 - 1996 Chevrolet P30, 1990 - 1993 GMC G1500, 1994 - 1995 GMC G1500, 1990 - 1993 GMC G2500, 1994 - 1995 GMC G2500, 1990 - 1993 GMC G3500, 1994 - 1996 GMC G3500, 1993 - 1996 GMC P3500, 1993 - 1996 GMC P6500, 1996 - 1996 GMC Savana 1500
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
Part interchange
74797, 15621507, 15995032
item #10015PLP
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HVAC Heater Control Valve for Ford F-150 Mustang Chevy Camaro Impala Pontiac
A-Premium®Part # APHCV026
HVAC Heater Control Valve for Ford F-150 Mustang Chevy Camaro Impala Pontiac
4.818 Reviews
$18.99
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2-year warranty
90 days free return
Fits 1980 - 1980 Buick Riviera, 1987 - 1988 Chevrolet Blazer, 1991 - 1991 Chevrolet Blazer, 1981 - 1981 Chevrolet Camaro, 1981 - 1981 Chevrolet Caprice, 1981 - 1982 Chevrolet El Camino, 1983 - 1984 Chevrolet El Camino, 1985 - 1987 Chevrolet El Camino, 1981 - 1981 Chevrolet Impala, 1981 - 1981 Chevrolet Monte Carlo, 1982 - 1982 Chevrolet Monte Carlo, 1982 - 1982 Chevrolet Monte Carlo, 1983 - 1984 Chevrolet Monte Carlo, 1985 - 1988 Chevrolet Monte Carlo, 1978 - 1979 Ford Bronco, 1991 - 1991 Ford Bronco, 1978 - 1979 Ford F-150, 1978 - 1979 Ford F-250, 1978 - 1979 Ford F-350, 1997 - 1997 Ford Mustang
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10013PS4
Note
This item fits the Ford Mustang fit Base/GT/SVT Cobra model.
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Heater Control Valve for Chevy Impala Camaro Ford GMC Cadillac Mercury Pontiac
A-Premium®Part # APHCV041
Heater Control Valve for Chevy Impala Camaro Ford GMC Cadillac Mercury Pontiac
4.818 Reviews
$22.99
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2-year warranty
90 days free return
Fits 1964 - 1964 Buick Electra, 1964 - 1965 Buick Electra, 1964 - 1966 Buick Electra, 1966 - 1966 Buick Electra, 1969 - 1969 Buick Electra, 1970 - 1970 Buick Electra, 1970 - 1970 Buick Estate Wagon, 1964 - 1964 Buick LeSabre, 1964 - 1966 Buick LeSabre, 1965 - 1966 Buick LeSabre, 1969 - 1969 Buick LeSabre, 1964 - 1966 Buick Riviera, 1969 - 1970 Buick Riviera, 1964 - 1966 Buick Skylark, 1969 - 1972 Buick Skylark, 1964 - 1967 Buick Wildcat, 1969 - 1970 Buick Wildcat, 1965 - 1967 Cadillac Calais, 1969 - 1970 Cadillac Calais, 1963 - 1970 Cadillac DeVille
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
item #10015LU1
Note
This item only fits the model with Heater.
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HVAC Heater Control Valve for Chevy Trailblazer EXT GMC Envoy XL Isuzu Ascender
A-Premium®Part # APHCV046
HVAC Heater Control Valve for Chevy Trailblazer EXT GMC Envoy XL Isuzu Ascender
4.818 Reviews
$24.99
Edit ZIP code
2-year warranty
90 days free return
Fits 2002 - 2006 Chevrolet Trailblazer, 2002 - 2006 Chevrolet Trailblazer EXT, 2002 - 2005 GMC Envoy, 2002 - 2006 GMC Envoy XL, 2004 - 2005 GMC Envoy XUV, 2003 - 2008 Isuzu Ascender
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10015Q9V
Note
This item comes with 3 Connectors.
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Heater Control Valve for Dodge Grand Caravan Charger Dart Chevy Camaro Chrysler
A-Premium®Part # APHCV027
Heater Control Valve for Dodge Grand Caravan Charger Dart Chevy Camaro Chrysler
4.818 Reviews
$22.99
Edit ZIP code
2-year warranty
90 days free return
Fits 1987 - 1987 Chevrolet Camaro, 1997 - 2010 Chevrolet Express 1500, 1997 - 2007 Chevrolet Express 2500, 2010 - 2010 Chevrolet Express 2500, 1997 - 2008 Chevrolet Express 3500, 2010 - 2010 Chevrolet Express 3500, 1990 - 1991 Chrysler Daytona, 1984 - 1984 Chrysler E Class, 1985 - 1985 Chrysler Executive Limousine, 1983 - 1989 Chrysler Fifth Avenue, 1981 - 1983 Chrysler Imperial, 1990 - 1990 Chrysler Imperial, 1980 - 1982 Chrysler LeBaron, 1984 - 1985 Chrysler LeBaron, 1990 - 1990 Chrysler LeBaron, 1979 - 1979 Chrysler New Yorker, 1982 - 1982 Chrysler New Yorker, 1984 - 1985 Chrysler New Yorker, 1988 - 1988 Chrysler New Yorker, 1979 - 1981 Chrysler Newport
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
Part interchange
HV1011C
item #10015EP9
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A-Premium APHCV057 HVAC Heater Control Valve
A-Premium®Part # APHCV057
A-Premium APHCV057 HVAC Heater Control Valve
4.818 Reviews
$26.99
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2-year warranty
90 days free return
Fits 1991 - 1991 Buick Commercial Chassis, 1992 - 1992 Buick Commercial Chassis, 1994 - 1996 Buick Commercial Chassis, 1991 - 1991 Buick Roadmaster, 1992 - 1992 Buick Roadmaster, 1994 - 1996 Buick Roadmaster, 1990 - 1992 Cadillac Brougham, 1992 - 1992 Cadillac Commercial Chassis, 1988 - 1992 Chevrolet Camaro, 1987 - 1987 Chevrolet Camaro, 1987 - 1987 Chevrolet Camaro, 1987 - 1987 Chevrolet Camaro, 1993 - 1995 Chevrolet Camaro, 1991 - 1996 Chevrolet Caprice, 1989 - 1990 Chevrolet Caprice, 1989 - 1990 Chevrolet Caprice, 1989 - 1990 Chevrolet Caprice, 1991 - 1994 Chevrolet Commercial Chassis, 1990 - 1991 Pontiac Bonneville, 1988 - 1992 Pontiac Firebird
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
ConditionNew
item #1005USLD
Note
1988-1992 Chevrolet Camaro fit the model with Air Conditioning.
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HVAC Heater Control Valve for Chevy Express 3500 G10 P20 GMC G1500 Savana 3500
A-Premium®Part # APHCV032
HVAC Heater Control Valve for Chevy Express 3500 G10 P20 GMC G1500 Savana 3500
4.818 Reviews
$22.99
Edit ZIP code
2-year warranty
90 days free return
Fits 1996 - 1996 Chevrolet Express 3500, 1990 - 1995 Chevrolet G10, 1990 - 1995 Chevrolet G10, 1990 - 1993 Chevrolet G10, 1990 - 1995 Chevrolet G20, 1990 - 1995 Chevrolet G20, 1990 - 1995 Chevrolet G20, 1990 - 1993 Chevrolet G20, 1994 - 1995 Chevrolet G20, 1990 - 1995 Chevrolet G30, 1990 - 1995 Chevrolet G30, 1990 - 1993 Chevrolet G30, 1994 - 1995 Chevrolet G30, 1990 - 1996 Chevrolet G30, 1988 - 1989 Chevrolet P20, 1988 - 1989 Chevrolet P20, 1988 - 1989 Chevrolet P20, 1988 - 1989 Chevrolet P30, 1988 - 1989 Chevrolet P30, 1988 - 1989 Chevrolet P30
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialPlastic
item #10015H4Q
Note
This item comes with 4 Ports.
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HVAC Heater Control Valve for Chevy Malibu Corvette Ford Mustang Buick Regal
A-Premium®Part # APHCV040
HVAC Heater Control Valve for Chevy Malibu Corvette Ford Mustang Buick Regal
4.818 Reviews
$20.99
Edit ZIP code
2-year warranty
90 days free return
Fits 1975 - 1975 Buick Century, 1980 - 1981 Buick Century, 1979 - 1979 Buick Century, 1980 - 1980 Buick Century, 1973 - 1975 Buick Century, 1973 - 1974 Buick Century, 1980 - 1980 Buick Electra, 1971 - 1974 Buick Electra, 1973 - 1973 Buick Electra, 1975 - 1975 Buick Electra, 1980 - 1980 Buick Estate Wagon, 1973 - 1973 Buick Estate Wagon, 1971 - 1975 Buick Estate Wagon, 1977 - 1979 Buick LeSabre, 1980 - 1980 Buick LeSabre, 1971 - 1972 Buick LeSabre, 1971 - 1974 Buick LeSabre, 1971 - 1975 Buick LeSabre, 1974 - 1975 Buick LeSabre, 1975 - 1975 Buick LeSabre
Add Trim and Engine info to ensure a guaranteed fit
Vehicle: Chevrolet
Item LocatedUnited States
Quantity1
MaterialSteel
item #10013KHD
Note
This item comes with Non-Thread End.
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How does a heater control valve work in car?

 

A heater control valve is a component in a vehicle's heating and cooling system that plays a crucial role in regulating the flow of hot coolant to the heater core.It acts as a temperature regulator, allowing the driver or passengers to adjust the temperature inside the vehicle.

 

When the heater control valve is closed, it restricts the flow of coolant, preventing hot coolant from circulating through the heater core. This occurs when the heater is turned off or when the temperature control is set to a cooler setting. By limiting the flow of hot coolant, the valve ensures that heated air is not being directed into the cabin, maintaining a comfortable temperature.

 

However, when the temperature control is adjusted to a warmer setting, a signal is sent to the heater control valve, prompting it to open. Opening the valve allows hot coolant from the engine's cooling system to flow into the heater core. As the hot coolant passes through the heater core, it transfers heat to the air that is forced over it. The blower fan then pushes this warmed air into the vehicle's interior through the vents, providing heating to the occupants.

 

Bad heater control valve symptoms

 

When a heater control valve malfunctions, it can lead to several noticeable symptoms:

  1. Insufficient Heat: The heater control valve restricts or blocks hot coolant flow, resulting in a lack of warm air from the vents when the heater is on.
  2. Inconsistent Heating: A faulty heater control valve can cause intermittent heat output, with periods of warm air followed by bursts of cold air.
  3. Coolant Leaks: Over time, the heater control valve may develop leaks, leading to coolant dripping or pooling under the vehicle.
  4. Inability to Adjust Temperature: Malfunctioning heater control valve prevents effective adjustment of the air temperature despite changing the controls.
  5. Overheating Engine: A stuck-open heater control valve can divert hot coolant away from the radiator, potentially causing the engine to overheat.

It's important to address these symptoms promptly to ensure proper functioning of the heating system and prevent potential engine issues.