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Posted on Jun 08, 2009
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Grand Jeep Cherokee Heater Doesn't Work

Heater doen't work, just blows cold air. Also uses a lot of coolant, forever topping up reserve. Coolant drips to the ground, don't know where from....

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  • Anonymous May 11, 2010

    Running with coolant level can and will destroy your head gasket and perhaps the cylinder head as well. If the heater is not getting coolant flow you are running with virtually no coolant inside the head. I suggest you seriously look for the source of your leak or if you have not already damaged the engine, you will soon.

  • Anonymous Mar 13, 2014

    heater stopped working, topped off coolant with coolant, worked fine then stopped again

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  • Posted on Jun 09, 2009
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Joined: Oct 10, 2008
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Water pump could be bad and leaking from the weap hole. you have no heat cause theres a hole in the coolant system

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1helpful
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So, my 2001 V8 Jeep Grand Cherokee Laredo is very slowly leaking coolant. I replaced the heater core in 2009 and the symptoms that the Jeep expressed then are not happening now. However, the low coolant...
are you mixing the coolant with water if yes,you need to just put straight up anti freeze ,because water evaporates at high temperatures .. also keep resorvoir full at all times there is a sensor in the tank that when is low it makes the check coolant light come on ,,....good luck
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Mar 21, 2011 • 2001 Jeep Grand Cherokee
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2004 Jeep grand Cherokee V8 what temp should the motor coolant be ? When the outside Temp gets down around 15deg or colder I get cold on my way to work about a 1/2 Hr drive. Coolant level is good, ...
Normal reading is around 195 degrees F. Probably needs heater control valve or backflushing of heater core.
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Jan 27, 2011 • 2004 Jeep Grand Cherokee
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Have 05 grand cherokee 3.7 blows cold air through heater and says overheating. i have flushed and changed out thermostat. hoses in good shape and water pump not leaking and no water in oil what could make...
How to diagnose an overheating 3.7
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Dec 03, 2010 • 2005 Jeep Grand Cherokee
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My 97 jeep grand cherokee heater blows cold air
check coolant & thermostat . then check blend door if they are ok check for engine if the head gasket is ok . last change the heater core.
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Mar 26, 2010 • 1997 Jeep Grand Cherokee
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Plenty of air but no heat one side of dash use to blow hot air. Now neither side blows hot air. 2000 jeep grand cherokee coolant is fine driver side seat heater doesn"t work air bag light comes on every...
Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.
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Jan 06, 2010 • 2000 Jeep Grand Cherokee
1helpful
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Heater quit blowing warm
First ensure the coolant is not low it must be at the right level or heater won't work top off the reserve expansion tank with 50 percent water 50 percent antifreeze mixture. Repalce the thermostat, purchase a Haynes repair manual at a Advance Auto parts store for diagrams and thermostat replacement procedure.
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Jan 05, 2010 • 1998 Jeep Grand Cherokee
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Grand cherokee heater blows cold air
Check the coolant level, sounds like you may be slightly low....Be sure heater is on high when filling the system....Look for any air bleeds...
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Dec 06, 2009 • 2003 Jeep Grand Cherokee
3helpful
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Once i start my car and turn on the heat, it starts blowing in cold air until i get on the road and accelerate more, then the heat starts coming. but once the heat starts it only lasts about two minutes...
Hi Jens,

Two things are happening.

The first is normal. Your heater gets its heat from the coolant ciculating in your engine. In order for it to work, the coolant needs time to heat up a bit. This is true of just about every vehicle.

When it gets cold again is the puzzler.

My advice is to check the coolant level in the radiator.

ONLY when the engine has cooled.

If the level is down, there can be times when there isn't enough water to cool the engine, fill the radiator and the heater core. The result is the heater blows cold air and the engine runs hotter than normal.

So check the coolant. Open the cap. Start the engine and top it off.

Then see if there is a change.

Best regards,
Mike
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Oct 16, 2009 • 2003 Jeep Grand Cherokee
1helpful
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96 Jeep Grand Cherokee will not blow out hot air
It's possible you are not getting enough coolant flow to your heater core. Try pulling the hoses off the core, blowing it out with air compressor, fill with water and blow out again. Try this about five times and see what happens. Alot of times these cores will plug up or have restricted flow. They will blow warm at low speed but it won't flow enough hot coolant through to stay hot on high blower speed.
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Feb 09, 2009 • 1997 Jeep Grand Cherokee
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2000 grand cherokee overheating heater blowing out cold air
Generally this condition is the result of coolant loss, or failed thermostat. If coolant goes below cylinder head level, or thermostat remains closed,heat will stop working. Do not drive with this condition as excessive heat buildup in cylinder head can and will do serious damage to heads and or head gasket.
Find out where leak is and correct it. Change thermostat as it may also be damaged. Check for excessive steam from tailpipe or miss in engine, as these symptoms indicate a cylinder head problem.
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Jan 03, 2009 • 2000 Jeep Grand Cherokee
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So, my 2001 V8 Jeep Grand Cherokee Laredo is very slowly leaking coolant. I replaced the heater core in 2009 and the symptoms that the Jeep expressed then are not happening now. However, the low coolant...

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