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2002 cadi deville the heat will come on when i hit a bump,ever so often;changed the thermostat and flushed the radiator;is there a air release vavle to let the air out of the system and were is it located

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Typically, you can remove some pockets of air in the system by setting the interior heat setting to maximum. This allows the coolant in the heater matrix and pipes, to circulate out, along with any pockets of air.

But I'm not sure air pockets are your problem. It especially sounds strange than you mention the heat coming on after a bump.
Are you sure your interior blower motor is working? Have you checked to see if there is air coming out from your blower vents in and under the dash?
If not, then please check your blower motor's connections and operation. If it is only working after a bump, then it could have suffered wear to the inner motor. In which case it may require replacement.

Posted on Nov 04, 2012

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SOURCE: peugeot expert 2.0 hdi heater problem, fan working ok, no heat

check the water pump

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SOURCE: 2002 jeep liberty has very

sounds like a head gasket problem. A minor leak there will pump compression into coolant and force it out of heater core. Any unusual steaming from tail pipe? Also: if radiator was flushed "in car" sometimes debris does not come out. Try flushing with it out of the vehicle. Jeep radiators are notoriously small for their application if not at at least 90% they will not work correctly.I'd look at the hg first though otherwise, your symptoms seem to be contradictory.

Posted on Jan 27, 2009

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SOURCE: no heat in my 2002 madza mpv.

Two most common causes of your problem are low coolant ( air in the heater core) and a thermo stat stuck open. If you have a temperature gauge and it is reading on the low side. Like 140 Deg or less, you need a new engine thermostat. Feel the top of the radiator tank after the car has been driven. If it is too hot to touch, the thermostat is no the problem. As the system has been flushed and filled I suspect there is enough coolant. Last item on the list is the coolant valve for the heater core. Many cars have a water valve located in line with the supply pipe to the heater core. This valve may be in the engine compartment or under the dash. Check the heater temperature control and follow the cables. One cable most likly goes to this valve. Maybe a cable retaining clop has fallen off

Posted on Feb 06, 2009

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remove pump and check that the imèller which is plastic hasnt seperated from drive shaft

Posted on Jul 16, 2009

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SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

Posted on Nov 19, 2009

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