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Old 10-04-2016, 11:16 AM
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Question Newbie with heating problem

Hello all, very new to this forum. My girlfriend has a 2007 Grand Cherokee V8 trail rated, and today she had problems with the heat not working when she had it idling this morning. But once she started moving, she felt the heat start to work.

Has anyone had issues with their heat while just idling, not moving? She said she let the car idle for a good 10 minutes.


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  #2  
Old 10-04-2016, 12:00 PM
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Re: Newbie with heating problem

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Originally Posted by Gatecrasher48 View Post
Hello all, very new to this forum. My girlfriend has a 2007 Grand Cherokee V8 trail rated, and today she had problems with the heat not working when she had it idling this morning. But once she started moving, she felt the heat start to work.

Has anyone had issues with their heat while just idling, not moving? She said she let the car idle for a good 10 minutes.

Did the temperature gauge indicate the engine warming up properly during the idle?

If it did, has it ever had problems staying cool in hot weather, where checking the coolant level, water pump flow, heater leaks/blockage etc. would be a place to start.
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Old 10-04-2016, 12:13 PM
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Re: Newbie with heating problem

I could possibly be the thermostat??? I would check the other items that ISTOWELL listed above first.
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Old 10-04-2016, 01:18 PM
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Re: Newbie with heating problem

In my experience that means the coolant is low. Not enough fluid in the heater core until the rev's are turned up.
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Old 10-04-2016, 03:11 PM
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Re: Newbie with heating problem

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Originally Posted by Diesel Dan View Post
In my experience that means the coolant is low. Not enough fluid in the heater core until the rev's are turned up.
This is my experience as well. My mustang has a very slow external coolant leak and thats how I know it needs coolant, when the heat starts acting up like that.
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Old 10-04-2016, 03:13 PM
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Re: Newbie with heating problem

you folks are fantastic, much appreciate all the replies! i will start with the coolant level and check what i can.

from what she says, the car was in the process of warming up but she had it idling for 15 minutes and even when the temp gauge was halfway up, the vents were blowing cold air, it was frosting the windows.

she doesn't think the jeep has ever had problems staying cool in hot weather in the past, but maybe the coolant is low for some reason?

i did notice the other day, what looked like water dripping off the underside of the car, basically underneath where the glove compartment would be. that wouldn't be coolant leaking out, would it?
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Old 10-04-2016, 06:08 PM
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Re: Newbie with heating problem

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Originally Posted by Gatecrasher48 View Post
you folks are fantastic, much appreciate all the replies! i will start with the coolant level and check what i can.

from what she says, the car was in the process of warming up but she had it idling for 15 minutes and even when the temp gauge was halfway up, the vents were blowing cold air, it was frosting the windows.

she doesn't think the jeep has ever had problems staying cool in hot weather in the past, but maybe the coolant is low for some reason?

i did notice the other day, what looked like water dripping off the underside of the car, basically underneath where the glove compartment would be. that wouldn't be coolant leaking out, would it?
well that's where condensate comes out from the A/C but also heater core leaks would come out from there.

My guess is if coolant is fine. I would suggest trying to burp the system of AIR. park it up hill CAR MUST BE COLD!!! never remove the radiator cap when hot. Remove radiator cap start car massage hoses see if bubbles show up run until hot. also turn heat to full blast.

You can also feel the heater Hoses. You may also try Backflushing the heater core, Ie remove hoses Run water through both hoses then reburp the system.

OR you have failed blend doors.

oddly enough this is a WJ
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Old 10-07-2016, 01:25 PM
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Re: Newbie with heating problem

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Originally Posted by Gatecrasher48 View Post
i did notice the other day, what looked like water dripping off the underside of the car, basically underneath where the glove compartment would be. that wouldn't be coolant leaking out, would it?
If you had the a/c on, your probably okay. But I would investigate for a possible leaking heater core. Sniff around the glove box for anti-freeze, and check for moisture in the carpet.

Another clue, when cold and you turn on the defroster and the windows do not de-fog or fog up.
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Old 10-16-2016, 09:59 AM
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Re: Newbie with heating problem

hey guys, does anyone have a link for a video showing how to flush the coolant out of the jeep? it's a 2007 grand cherokee 4WD 4.7L
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