Question about 2001 Chevrolet Silverado 2500HD

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Air pocket in coolant system

Fan blows good but no heat

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  • swissmade59 Feb 28, 2009

    ford /focus 2002 put in a thermostat can't get air pocket out what now

  • Richard Delahant May 11, 2010

    try having the system bled of any air build up. There are 2 other things to have checked----- there should be a vacuum operated actuator valve that opens the heat vent door, and the heater control valve. The acuator valve is under the dash usually up and behind the ac ducts.

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  • 141 Answers

Loose Radiator or coolant cap in cold and have the car idle for five minutes with out the cap, or have the car idle for 10 minutes, wile running remove cap, let air pressure out and put cap back, do it 3 or 4 times till all air is out...

Posted on Jan 22, 2009

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Sounds like you have an air pocket trapped in the coolant system.This will cause intermittent heat and especially at idle with little water pump circulation.Try to remove the reservoir cap when not under pressure and start the engine.allow the engine to reach operating temp and allow any trapped air to escape for about 30 minutes.turn off the engine and allow it to sit without the pressure cap on for around 5 minutes.Top off coolant as needed and replace the cap.Let's see what happens from there.Hope this helps,
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04 sentra 1.8 over heats after a highway drive. Pull off the highway and come to light and needle shoots to just under H! Start to drive and needle drops right away. Changed thermostat, did two rad...


Air pocket need the thermostat housing.

Air is not a good conductor of heat.

Park you car on a hill and let the air pocket to work itself out to the cooling system.

A shop will charge $65+ to purge the air out.

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Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


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You may want to reconsider if the fan is working at it's full potential.It seems when the vehicle is moving the extra air flow compensates for the fan not blowing hard enough.Check for radiator obstructions such as leaves and debris.And check for small leaks.Also there may be an air pocket in the system which can still seem like the system is full.With vehicle cold take off radiator cap and run vehicle.Turn on heat to highest setting (blowing).When vehicle reaches thermostat rated temperature(opened thermostat) you will see coolant go down in radiator.Fill radiator while the engine rpm's are up (have someone hold the throttle to where the rpm's are at about 1800) then put on cap before returning to idle.This should remove the pocket if there is one

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Honda civic 1998 over heating. cooling fan problem? Where are the fuses for that. Thank you


Most likely you have a bad thermostat is stuck and not letting coolant to flow to your radiator. check your coolant level if is normal replace the thermostat NOTE: if you live air pockets on your cooling system then also cause to over head when adding new coolant open the bleeder valve if you cant find it just add coolant whit the engine running when the new thermostat open will release the air pocket and you will see a sudden drop of you coolant level, then add more on till the radiator is full again. never drive your car for long is your engine is over heating that will cause a blown head gasket and mayor repairs. if your on the street and just notice than your car is over heating turn your A/C off set it on heating maximum fan max heat and of coarse roll down all your windows. it be real hot for you but that will save your engine. the heater core on your car is like a baby radiator and bypass the engine thermostat that will help to cooled down a lot . hope this help you and good luck.

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Heater in 1998 Ford Taurus


When u flushed the radiator, what did u find? Was the old coolant dirty, rusty, sediment in it? What u describe sounds like the core is plugged up w/ junk. This would be my 1st choice of the problem, especially if the coolant was rusty, cruddy, as described above. It wouldn't be an air pocket (after a couple of years). Some cars do have a valve that opens and closes to allow the hot coolant into the core for heat, or a flap door that opens to allow the fan to blow air thru the core for heat, but the fact that this started when u flushed the system leads me to believe it's a plugged up core. U could try to flush the system again, make sure the heat is on when u do, so u have circulation tthru the core to help flush it out. let me know how u make out. good luck!

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