Question about 2003 Jeep Grand Cherokee

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No heat, fan works correctly just blows cool, from time to time it will get hot then get cool again

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First things first, check the coolant level in the rad and overflow. If that is correct, you are probably in need of a new thermostat. They are a common problem on a lot of Chrysler products, but they are fairly cheap to replace.

Posted on Feb 03, 2010

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Posted on Jan 02, 2017

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We borrowed our daughter's Hyundai Santa Fe to make a trip to the mountains on a 105 degree day. It was doing great on mountain highways until we stopped after about 3 hours.


May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
Let car cool off, start engine and let it warm up without driving. Monitor temp and fans. When temp gets about normal, look for fan to kick on. Then when turning on a/c, look for the other fan to kick on. Don't let engine overheat. If one or both fans don't come on, start there. Check fan motor not locked up, relay working, fuse/wiring good.

Jul 07, 2017 | Hyundai Santa Fe Cars & Trucks

1 Answer

1989 ford f 150 i been driving and the engine stop fuel have don't start


could be fuel pump,check for fuel see if fuel pump supplying fuel and you are getting spark.make sure ignition timing is correct and the idle speed setting correct check the under hood emissions information label.also check engine make sure engine not over heating check cooling fan clutch see if cooling fan clutch is okay by turning it by hand if engine is hot cooling fan should have resistance if engine is hot, if cooling fan feel loose no resistance the fan clutch is bad.

Feb 06, 2012 | Ford F-150 Cars & Trucks

2 Answers

I have a 2006 elantra and whenever i slow down or stop the needle goes into the red zone and the a/c blows hot air. when i drive faster again the needle goes back to normal and the a/c blows cold air...


your electric fan for the AC is not working for whatever reason so when idles its all getting hot the engine and the AC system .This sort of work can be difficult to diagnose correctly and a code reader is about as good as a bible at mosque so seek the advice of a skilled mechanic who should be able to pin point the fault in seconds

May 30, 2011 | Hyundai Elantra Cars & Trucks

1 Answer

My heater, when parked and idle, cools down. The heater will heat again once I begin driving, but this is freezing me as I sit and wait for my kids at school. It blows cool air while I am parked and will...


It could be the electric fan is going on too easily.
The radiator and hoses should be almost too hot to touch.
And when cold, the fan should not really do on at all.
But the thermostat could be opening too soon also.
There are two hoses to the radiator, and when you start a cold car, only one should slowly get hot.
The other should stay cold until the thermostat opens, after the engine is good and hot.
If both start slowly getting warm at the same time, then you need a new thermostat.
And also make sure you have enough coolant in the radiator.

Dec 20, 2010 | 2007 Chevrolet Impala LS Sedan New Cars

1 Answer

A/c blows hot air when the car is not moving but it will blow cold air when the car is moving.


Check to see if your electric cooling fan is working when the vehicle is in park with the engine and a/c running. If the fan isn't running then the a/c won't be able to blow cool air as it can't get rid of the heat through the condensor which is located ahead of the radiator. When you are driving over about 35 mph there is enough air being forced through the condensor and radiator to get rid of the heat and the a/c will start cooling properly again. If the fan isn't running and you sit with the car idling long enough [such as in heavy traffic] then the engine may overheat as it also has no way of cooling if the fan isn't working. Usually this fan is powerd by a 30 amp Maxi fuse but each model is a bit different. Your owners manual should have an illistration of the fuses and what they power. Good luck, hope this helps a bit!

Aug 11, 2010 | 2008 Chrysler Pt Cruiser

2 Answers

While driving my 2006 torrent the ac works fine but when i come to a stop or idle it blows hot.


the condenser cooling fan(s) are not working. Usually, it will be a fuse, the relay, or a bad fan motor itself. It cools while your car is moving due to ram air flow through the condenser....

Jun 26, 2010 | 2006 Pontiac Torrent

2 Answers

1999 Dodge Dakota heater does not blow hot air.


It is most likely a closed or mostly closed thermostat, cheap fix and very common.

Dec 08, 2009 | 1999 Dodge Dakota

1 Answer

AC cools then blows hot air, tempature needle goes up & down


Sounds like the thermostat is trying to stick,and is causing the engine to over heat,therefore condenser is not cooling the freon down enough to cool.Have the thermostat changed and the cooling system bled out,this is most likely the cause.

Aug 29, 2009 | 2005 Lincoln LS

1 Answer

No heat unless set at max temp. setting.


Hey Summers,, Are you running the A/C with the temperature set at max heat?? If yes. STOP... the A/C is for COLD air..As far as the fan speeds not working....you may have a fan switch that is going bad..(my vehicle is doing this!)..

Jun 16, 2017 | 1999 Oldsmobile Bravada

2 Answers

2005 Nissan Sentra, AC blowing hot & engine overheating


most likely a thermostat because the pressure on the a\c will be high if engine is over heating or the fans are not kicking on (check fan relay)

Aug 25, 2008 | 2005 Nissan Sentra

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