is there a heater control valve in this car?...why do i have to run A/C? it of course blows cold air, but it is only way i can clear window. where should i start to diagnose problem?? thx. in advance..
1990 honda accord, coolant temp. is normal, but heat in car not. also have to put A/C on along with defrost.
I would start with the Thermostat, then check the other heater hoses for blockage, replace the thermostat and the hoses, if that doesn't fix it, then you may need to replace a clogged heater core.
Reply:It's normal for the A\C to come on with the defroster on.
The A\C condenser attracts moisture in the air to improve the efficiency of the defroster.
As far as the heater not working, check your coolant level.
Could also be the coolant valve at the fire wall.
Reply:Maybe your heater core is broke. Is your front floorboard wet?
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