Question about 2000 Jeep Grand Cherokee

3 Answers

Heater blows cold air when idle

When my 1999 jeep grand Cherokee is driving the heater blows hot air when driving but when it idles it blows cold air even though the engine is warmed up, any ideas?

Posted by on

  • Anonymous Mar 18, 2014

    2008 Mustang...cold air comes from vents when heater is on. If car runs for a while, eventually the air will warm up. Could take up to 20 minutes for this to happen. And, seems to happen after RPMs get up to a certain number. Any ideas?

×

Ad

3 Answers

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

  • Contributor
  • 1 Answer

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

Ad
  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.

  • Contributor
  • 1 Answer

Symptoms: heater blows hot while driving/higher rpms but blows considerably cooler when at idle.

If you do not know the last time you had your heater core flushed, then it is long overdue,,,try this first. Cheap and easy to due, or about 75 bucks to have it done at your local shop. You will be amazed at the crud that will come out. This is the stuff that plugs your heating system. You should notice the difference immediately.

Posted on Jan 02, 2013

  • Al Baxter
    Al Baxter Jan 02, 2013

    Symptoms: heater blows hot while driving/higher rpms but blows considerably cooler when at idle.

    If you do not know the last time you had your heater core flushed, then it is long overdue,,,try this first. Cheap and easy to due, or about 75 bucks to have it done at your local shop. You will be amazed at the crud that will come out. This is the stuff that plugs your heating system. You should notice the difference immediately.

×

Ad
  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 35 Answers

Replace the thermastat with a higher temp rating, but first make sure that the fluid level is optimal,....low fluid will cause this,,,as will an old thermastat

Posted on Jan 03, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do i replace/install a heater core for a 1999 limited edition jeep cherokee 4.0 liter 6cyclinder


I would make sure the core is the problem. You may have a heater control valve that cuts off flow to the core by vac. or a blend door that cuts off air flow thru the core.
You will need a shop manual to replace the core. The dash and console have to come out, along with discharging the ac.

Dec 18, 2012 | 1999 Jeep Grand Cherokee

1 Answer

97 jeep grand Cherokee wont blow hot or cold air on any setting and the blower motor is fine


is your car warmed up? if it is already warm, probably you have a clogged heater core and/or airpocket in system.

to bleed airpocket, raise the front part and try to bleed air from bleeding screw. you will see bubbles if there are any after few minutes of idling.

if nothing helps you will understand that you need a new cabin heater or you need to try to clean debris out. be informed that this requires you t remove almost all parts of dash.

Nov 06, 2011 | 1997 Jeep Grand Cherokee

1 Answer

My heater will turn on after my jeep warms up and then shut off blow cold air and never g Get hot again


The A/C and heating problems in GC's is most often caused by broken blend doors, which control the flows of hot and cold air.

Dec 01, 2010 | 1999 Jeep Grand Cherokee

2 Answers

1999 jeep cherokee sport heater problem. Air just blows warm and not hot. Gets warmer when stepping on the gas, but still goes back to warm and then cold.


Check the coolant level in the over flow tank/ bottle under the hood. You may find that the coolant tank is empty or very low, causing the engine to also not have enough coolant to circulate in the heater core that provides heat to the passenger area. Just a simple solution for now.

Feb 20, 2010 | 1999 Jeep Cherokee

1 Answer

Heat isn't working


Common Jeep problem. Blend doors are either jammed or broken. Dashboard removal is require to repair.

Jan 14, 2010 | 1999 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

2006 Jeep Grand Cherokee Laredo ac not cooling


My 1999 limited does this. When i bought it off the guy he said that its because of some flap down by the passengers left foot. In mine the passenger air barely even blows because of this.

Jun 17, 2009 | 1999 Jeep Grand Cherokee

2 Answers

1999 Jeep Cherokee sport/air vents do not blow out cold or hot while it is on


this sounds like the recirculation door in the heater box is broken and this is a difficult and can be an expensive repair as the dash has to be removed for access. a quick check for this is if you release the glove box and let it hang you will see the heater box if you reach up to the left top you will feel a grid and the recirc flap is housed there you can operate the blower and hot and cold and see if flap moves

Jun 02, 2009 | 1999 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

1 Answer

Cold air when the heater is on.


The center blend housing on the heater/a/c assembly is probably broken.

Dec 10, 2008 | 1999 Jeep Grand Cherokee

Not finding what you are looking for?
2000 Jeep Grand Cherokee Logo

1,606 people viewed this question

Ask a Question

Usually answered in minutes!

Top Jeep Experts

Marvin
Marvin

Level 3 Expert

85223 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Jeep Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...