Heater blowing cold air

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DaveS

DaveS

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Hey Guys,
im gonna keep this short.

heater blows cold air when set to warm

hoses to cabin are warm.
blower is working.

what gives?
where do i begin looking?
 
Is the coolant full?

This is common when the level is low, air bubble in the system, etc.
 
Maybe the cable came off on the hot/cold control? Move it back and forth to hear if the flapper door is moving?
 
Is the return line to the water pump hot / flowing
 
Hot water is flowing through your heater core at all times, unless your system has an inline heater control valve. By flipping your lever to warm, you are opening a door to allow the warm air into the car. It would seem your door is not opening.
 
Sometimes the hose temp can fool you - little to zero flow with a semi-clogged core, but everything warms up eventually. Disconnect the hoses at the engine, blow it alternately in both directions w a garden hose.
 
Make sure to blow it OPPOSITE from engine flow, I had trouble with my Dakota, which has VERY small passages in the core. Chrysler should be sued for the design of the damn thing.
 
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