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2004 jeep grand cherokee heater blowing cold air

Sometimes while driving my heater will start blowing cold air then later blow hot air

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Thermostat probably sticking.. is the temp running normal or cooler than normal

Posted on Dec 28, 2013

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Posted on Jan 02, 2017

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SOURCE: Heater blows cold air when idle

Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

Posted on Jan 03, 2009

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SOURCE: Heater blows cold air

If the "Heater In Hose" gets hot, and the "Heater Out Hose" does not get hot, than either the Control Valve is sticking closed, or your heater core is plugged up with ****!

Have you used "Barrs Leak" or a simular product for a radiator leak? That will sometimes clog the heater core.

I have a 1993 Grand Cherokee, which "Normally" throws very hot air out of the heater, but lately sometimes it only throws warm air, till I make my first stop, than it gets hot.....all because the heat control valve is hanging up.

Low water in the radiator will also cause a heater to not work.....if the water level is too low to circulate to the heater.

XRM

Posted on Feb 18, 2009

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SOURCE: 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...

Posted on Dec 06, 2009

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1 Answer

Heater blows cold air


soun ds like heater core is plugged. did you try back flushing the system?

Sep 27, 2012 | 2005 Jeep Grand Cherokee

1 Answer

No hot air control


Probably broken blend doors if everything else is working, but its just blowing cold air. Do a google search for "Jeep Blend Doors" or "Heater treater" for more info.

Jan 07, 2010 | 1996 Jeep Grand Cherokee

1 Answer

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...

Dec 06, 2009 | 2003 Jeep Grand Cherokee

1 Answer

Will not blow hot air.


the jeep cherokee are fitted with a heater valve that sometimes get blocked or stuck in the same place .Start by checking weather the heater pipes going in to the heater matrix are hot if both pipes are cold then your looking at a thermostat problem and if only one of the pipes are hot then its more than likely to be the valve

Oct 28, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Driver side blows hot air passenger side blows cold


try flushing out the heater radiator core.remove the two pipes and put a hose on the conections and keep reverseing flow.dont forget to top up with pure antifreeze,

Feb 05, 2009 | 1999 Jeep Grand Cherokee

2 Answers

The heater is only blowing cold air


First, check to make sure you are not low on coolant. Check hoses going to heater and see if they are getting hot.(one should be hot, the other should be slightly less hot but not cold or just warm) Check heater control valve to make sure that it is operating, Check that plenum door is opening properly inside the cabin, in the heater box. If you have done any work at all on cooling system, run the engine 'till it reaches operating temp with radiator cap off...sometimes htr core can become air-bound. Also...goes without saying, but make sure that engine reaches normal operating temp while driving. If not check thermostat!

Jan 24, 2009 | 2004 Jeep Grand Cherokee

1 Answer

Passanger side heater blows cold while driver side is hot


U will need to replace the pass side air temp control blend door acuator motor.

Jan 22, 2009 | 2004 Jeep Grand Cherokee

3 Answers

Heater blows cold air when idle


Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

Jan 03, 2009 | 2000 Jeep Grand Cherokee

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