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Civic heater problem

01-29-2006, 08:10 PM
Have a 1988 Civic with a heater that only blows cold air no matter how warm the engine is. Put in a new thermostat, flushed the heater core(flows nicely), the mixing valve opens and closes, and the belts are tight. When I pull off the heater outlet hose (plug engine opening) coolant barely flows out. Is there such a thing as a weak water pump? Or could it be something else? Any ideas are appreciated.

01-29-2006, 08:21 PM
You lose any coolant at all? heater core maybe.

01-30-2006, 06:19 AM
if the impeller on the water pump wasnt working properly youd be experiencing overheating. are you sure the lines going from the motor to the heater lines are clear?

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