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OK heres another one on same Cherokee....back flushed the heater core...changed thermostat and still blowing lukewarm heat... 3 people said sounds like a cracked head or head gasket but wouldn't that make it overheat?

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Could be in the temperature control knob on the climate control cluster not switching over.

Posted on Nov 18, 2014

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OK heres another one on same Cherokee....back flushed the heater core...changed thermostat and still blowing lukewarm heat... 3 people said sounds like a cracked head or head gasket but wouldn&#39


you are air locked in the heater core you will have to remove one heater hose and fill anti freeze into that hose until coolant runs out of the open nipple then put hose back on fast top off coolant start engine run til both hoses are hot for heater core..if only one is hot coolant is not circulating

Nov 18, 2014 | Jeep Cherokee Cars & Trucks

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Having problem with my heater on a 2000 jeep cherokee sport. It blows fine, switches from floor to vent to defrost fine, but I only get a little heat. I flushed the core but still little heat. how big a...


It is a rather involved job to replace the heater core. Here is a link showing how to replace it:http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f802d7d3c
I would first check to see if the thermostat maybe stuck open, which wouldn't allow the engine to heat up enough to supply hot water to the heater core.

Oct 18, 2010 | 2000 Jeep Grand Cherokee

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No heat/defrost 01 corolla


Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.

Jan 17, 2010 | 2001 Toyota Corolla

2 Answers

I HAVE A 95 JEEP GRAND CHEROKEE AND ALL I GET IS LUKEWARM AIR WE HAVE FLUSHED THE SYSTEM CHANGED THE THERMOSTAT, RADITOR CAP AND HOSE, WATER PUMP NO CANGE WHAT ELSE CAN I do?


If your gauge is showing correct operating temperature and you are getting no heat from the heater, check (just feel them) the hoses leading from under the hood through the firewall that service the heater. One should be uncomfortably hot, the other only warm. If they are pretty close to equal or even cool, you have an obstruction in the heater hoses. Rubber hoses in the cooling/heating system are made up of laminated layers and if aged enough, the inner lining can separate and collapse blocking the flow of water either to or from the heater core. Sometimes, if bad enough, squeezing the hoses by hand can even locate the failed section; it will be noticeably weaker than the rest.

Jan 13, 2010 | 1995 Jeep Grand Cherokee

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Heat is luke warm at best on low. blows fine. had heater core flushed. still not sufficient temp.


One or more of:

1. Your coolant level is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Jan 08, 2010 | 1999 Jeep Grand Cherokee

1 Answer

1998 Tercel Cold heat to the windshield. Lukewarm out front vent.


Hey,

I just replaced my thermostat in my car due to the same problem. Except mine was a 92. I figured I'd start with the thermostat and antifreeze. Then the heating core. Now I have heat.

But yet I still have no heat on the windshield.

Oct 23, 2009 | Toyota Tercel Cars & Trucks

1 Answer

No heat from heater


sounds like the thermostat is stuck. check this first. easier just to remove it and reinstall without one just to see if you get heat. If still not working then there needs to be a good flushing to be done. just make sure when you do a flush to leave heater controls to hot. if still not working then sounds to be like a bad heater core. you might need a professional flush which uses high pressure to blow out any clogs in heater core. hope this helps.

Feb 22, 2009 | 1995 Toyota 4Runner

1 Answer

2000 Cherokee not warm


Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.

Hope this helps! Have a great day and try to stay warm!

Nov 19, 2008 | 2000 Jeep Grand Cherokee

1 Answer

New heater core not hot


If your radiator is not clogged, your thermostat is working, and you have a new heater core, it sounds like when your mechanic was installing your heater core, that he possibly pulled a vacuum line loose or forgot to hook one back up. On most all late model vehicles, heater controls are vacuum operated. One line to move the selector flap from vent to floor to defrost, etc., and one line to move the heat flap from hot to cold. Most vehicle manufacturers changed from mechanical controls to vacuum operated controls to try to simpify the system and have less parts to have to replace. However the set-back with this is that when a vacuum line comes loose, it can be harder to locate your problem whereas a mechanical issue would obviously be right behind the controls inside the dash. If your problem is vacuum related, you can most likely assume that the problem will be somewhere under the dash, as that is where those particular vacuum lines should be routed, and also is what the mechanic had to disassemble when replacing your heater core.

Nov 17, 2008 | 2000 Jeep Grand Cherokee

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