Question about 1998 Jeep Cherokee

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Jeep cooling system

Heater blowing hot & cold & expansion tank blowing coolant

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Lots of guys I know have switched their cooling systems back to an "open" system because of the same problem. Make sure that the system is full when cold that there are no mechanical problems such as a bad clutch fan, electric fan or thermostat. This should be sufficient info to get you started in the right direction!
Good Luck

Posted on Dec 29, 2008


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You should have a vacuum puller, but alternatively, you can purge it by letting in freon on the low side and opening the high side for about 4 seconds, that should purge all the air in the system.

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the silly side tank, (they fail easy)
never do that, on the next cold morning , dead cold
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1 Answer

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I have an audi 97 a4 6 sylander and i had to change the metal pipe wich transfer water from reservor to termostat housing do i need to bleed the system after fix and soo wher is the bleeding valve thanks...

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1 Answer

Ford Ranger 87 2.9 XLT Heater not blowing Hot air. All vents are blowing out air, defrost, lower and middle. Flapper is closing from AC to Heat. I do not think that the heater coil is getting hot . One...

when car is at operating temp both heater pipes should be more or less the same temperature. If one is cold, try getting the car up in the air so the radiator or expansion tank is higher than the heater...release (carefully) the pressure cap and give the engine three good revs, see if any air comes out and heater pipes equalise. I there is no air in your system you may have a heater water valve fault. Try to locate valve and see what contols it (mechanical , electrical, vacuum)..maybe itcan be manually moved to open, maybe it neds to be replaced.
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1 Answer

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3 Answers

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