SOURCE: Heater wont work in my 1990 Chevy Truck
Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.
SOURCE: fixing back brakes to 1990 chevy truck
try autozone.com to see if they have your car listed for diagrams pictures and step by step instructions if your car is not listed then try your local library they have all the car manuals and even copy them for you
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