Question about 1998 Jeep Cherokee

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Jeep cooling system

Heater blowing hot & cold & expansion tank blowing coolant

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  • Jeep Master
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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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HOW TO LET THE AIR OUT THE COOLING SYSTEM ON A 2002 JEEP GRAND CHEROKEE


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.

Mar 04, 2015 | 2002 Jeep Grand Cherokee

2 Answers

Heater not blowing hot air


it appears that you have an air lock in the coolant system. bleed out the air by loosing of the highest hose until only water comes out or have the system pressure bled at a radiator shop.

Jan 25, 2014 | Jeep Liberty Cars & Trucks

1 Answer

Thermostat problems


your easy, that is caused by AIR Pocket in the engine block
the gauge can not read, air temps so if air is below the engine
coolant thermostat the ECT reads hot then air (cold ) repeats
you lost coolant and the number one reason for that is trusting
the silly side tank, (they fail easy)
never do that, on the next cold morning , dead cold
you take off the RAD cap. look down the neck, is it full of green
AF? id bet you its not.
the cab heater will never work with no engine heat, ever. so ......
never do the above on any hot engine.
also the thermostat might be bad and the coolant overheated
and blew out, so get a new STAT.
the flush the system, and refill with 50% AF.
or worse. lots of ways to overheat.... ask.
the side bottle only works, (called the expansion tank)
if never overheated
and the tube in side is not dropped off
and you never let it go dry, ever.

those facts and others are why we check the RAD directly cold.


Jan 16, 2014 | Jeep Compass Cars & Trucks

2 Answers

96 dodge grand caravan... blows cold on passenger side when heater on, as well controls reversed. cold is hot nad hot is cold


SOMEHOW I BELIEVE YOUR TWO INTAKE & RETURN HEATER HOSES THAT FEED THE HEATER CORE HAVE BEEN REVERSED. EITHER THAT OR a plugged heater core

Feb 10, 2013 | 1996 Dodge Grand Caravan

2 Answers

Coolant recovery failure


Check the hose going to the expansion tank, That it is not pluged up.

Nov 03, 2012 | Cars & Trucks

2 Answers

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...


you dont have to bleed the water it automatically takes out the air when it runs and the thermostat valve opens check the level again after a run of 5 miles or when the temp is in the middle

remember not to check when the engine is hot

Feb 07, 2011 | 1997 Audi A4

1 Answer

Temperature/heat wont work/dashboard lights on and off


It sounds to me like you're low on coolant. When you checked the coolant level, did you actually open the radiator cap and make sure the radiator is full? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. There is a hose that runs from that tank to the top of the radiator so if the radiator gets low on coolant, more coolant -should- run in from the overflow tank. However in practice this does not always work. I have a Jeep that leaks coolant and experiences this exact same problem. Coolant will not run from the reserve tank into the radiator because the hose is plugged up, and whenever the radiator gets low on coolant the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Feb 12, 2009 | 2001 Pontiac Sunfire

3 Answers

1996 ford contour gets hot , no hot heater or temp guage movement


Is your temperature gauge working now? That is of more concern then your heater as you wouldnt know if your engine was overheating until its too late. Your heater core could be clogged, they get clogged quite easily. You can flush them or replace. The part is inexpensive but on some models you have to take out dash to replace them, but on other models it only takes about 30 mins and a few bolts.

Dec 17, 2008 | 1996 Ford Contour

1 Answer

Heater problems


Did you bleed the air oout of the cooling system - Their is a bleeding next to the therostat housing.


1 - When the vehicle is cold remove the rad(tank) cap and top up the level if needed

2 - start the vehicle with the rad cap off and leave the car run until you can see that the therostat has openned(look in tank/rad) to see fuild flow then open the bleeder slowly to let any air out of the cooling system. Once you have coolant flowing out of the bleeder close the bleeder and install the rad/tank cap.

NOTE - Be careful with the engine running and hot Coolant.

You make need to bleeding system 2-3 time to get all the all out. Once all the air is out of the system you problem should be solved. If air returns to the coolant system have the system checked for possible head gasket leaking air into the coolant system

Nov 19, 2008 | 1997 Dodge Intrepid

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