COOLING/HEATING

Asked by Dec 09, 2008 at 12:49 PM about the 1996 Honda Civic DX

Question type: Maintenance & Repair

1.WHERE IS COOLANT BLEEDER VALVE(TO PURGE AIR FROM SYSTEM).
2.MY HEATER BLOWS COLD AIR(BOTH HOSES NEAR FIREWALL ARE HOT).IT SEEMS TO ME
THAT AIR CIRC.SELECTOR IS NOT WORKING.ANY TIPS ON WHERE AND HOW TO CORRECT THIS PROBLEM WOULD BE APPRECIATED.

3 Answers

2,150

The air should automatically purge from the radiator through the recovery tank unless the system is dangerously low on coolant. Are you filling the cooling system through the radiator cap or the recovery tank? You should be filling while cold in the radiator. On a cold engine, remove the radiator cap. Insure the radiator is 100% full. If it isn't then fill with a 50/50 mix until full. LEAVE the CAP OFF and start the engine. Once it warms up, the thermostat will open and the radiator coolant level will drop. This will purge most of the air, then fill to capacity again and REPLACE the CAP. The water pump will circulate coolant SUCCESSFULLY only when the system is filled properly; sounds like yours isn't. When the coolant is low, a steady stream of coolant will not circulate through the heater core. Once the coolant in the core cools, you no longer have heat.

35

also, make sure that the heater core isn't clogged or leaking neither.

2,150

If the core had blockage, it would overflow from the surge tank. If the core had failed, it would leak into the passengers compartment. He didn't mention EITHER of those symptoms. You're creating extra effort.

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