Question about Chevrolet Cars & Trucks
Already replaced water pump thermistat
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Posted on Jan 02, 2017
SOURCE: heater blowing cold air
Low fluid or bad therostat if it does it when engine is warmed up.Heater control valve replaced or mixing valve? If so you have a vacuum hose disconected
Posted on Oct 31, 2009
It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.
But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.
Posted on Dec 07, 2009
the problem is probably the heater core, it can become clogged with dribris. this stops heat from the engine getting to it and then no heat.
Posted on Dec 08, 2009
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