Question about 2003 Jeep Grand Cherokee

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Over heats when idleing. I changed the thermostat and coolant sensor but the fan does not come on

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You should be able to unplug the two wire coolant temp sensor with truck running.. after a second or two the fans should come on if not check to see if you have power to the fans..

Posted on Nov 13, 2010

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1997 Chevy Lumina 3.1 engine. The cooling fans aren't coming on tell the car heats up to over 250 degrees.


Did you check for applicable trouble codes? Anything? Some of the national brand auto stores will check codes for free.
Check the coolant temp sensor, if you haven't already? Some makes and models if you turn on the ac, the fan/s will run. If you unplug the coolant temp sensor, the fan may run.
I might want to use non--contact infrared temp gun just to double-check temp gage.
Have you ever checked thermostat or coolant flow through the radiator. I understand it only heats at idle.

Mar 14, 2016 | Cars & Trucks

1 Answer

I have a 2000 Mitsubishi eclipse and my radiator fans run from startup a few minutes after shut off.It affects heat until higher rpms.i need better heat and quicker.


Here are a couple of thoughts on this problem:

1. Just for fun and giggles, it might be a good idea to have the thermostat checked one more time. I know it is a new thermostat but you never known if a thermostat may have failed even right out of the box. It is possible that thermostat could be shot, even thought it was new. I know it is a long-shot, but it never hurts to give it a try.
2. Check the fan sensors. The Eclipse has used an electric, rather than mechanical, fan for some time. It is possible over time that the start and stop sensors can go out of tune and that they can raise your fan's run rate on starting, cruising and idling. In this case, the mechanic is right in that the higher speed is causing the coolant to be cooled off more quickly than it should and the result is that your vehicle's cooling system is causing problems for your Eclipse's heater sensors. If the sensors don't get information that the coolant flowing through their portion of the cooling system isn't the right temperature then the heater won't kick off and all that will happen is that the heater will wait until it senses the coolant is the right temperature.

Feb 22, 2015 | 2000 Mitsubishi Eclipse

1 Answer

1999 Olds Alero 4 cyl running hotter than normal. One mechanic says it's Heat sensor that opens and closes. The other mechanic who ran car says it was thermostat that turns on dual fans. Ok well one was...


REPLACE THERMOSTAT.ITS STICKING CLOSE TO KEEP COOLANT FROM CIRCULATING THROUGH ENGINE AND RADIATOR. THE FANS SHOULD COME ON WHEN VECHICLE SETTING AT A LONG IDLE.THE COOLANT TEMPERATURE SENSOR GET TO CERTAIN TEMPERATURE WHICH WILL COMPLETE CIRCUIT PCM SEND POWER TO COOLANT SENSOR THEN TO COOLANT FANS RELAYS AND FANS.IF VECHICLE OVER HEATING WHILE MOVING THERMOSTAT FAULTY.IF YOU TURN AC AND COOLANT FANS DONT RUN CHECK COOLANT FANS FUSE AND RELAY.IF COOLING FANS DONT TURN ON WITH AIR CONDITIONER ON EITHER COOLANT TEMPERATURE SENSOR FAULTY OR PCM FAULTY.IF ALL LOOKS GOOD.IF ENGINE OIL LOOKS LIKE MILK SHAKE.YOU HAVE BLOWN HEAD GASKET.

Nov 11, 2010 | 1999 Oldsmobile Alero

2 Answers

Car begins to over heat when idle. anti freeze in radiator and had a flush and fill


check the radiator coolant fan,or the R C fan relay. If radiator coolant fan went out your car will over heat when idle .

May 04, 2010 | 1996 Buick Century

1 Answer

Replaced thermostat, radiator on it, still over heats after about 15 minutes on idle.. Fan never seems to change speeds and idle jumps at higher temperature. Any Ideas?? Thanks!


When engine running, ensure no engine combustion gas bubbles in coolant resevoir (if so, the head gasket is blown).

Check radiator cooling fans are operating ok (as required when car warms up) - if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check for collapsing (soft) coolant hose on suction side of waterpump when engine revs above idle.
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary,
Check radiator cooling core is not blocked internally or externally.

Jan 17, 2010 | Ford F-150 Cars & Trucks

1 Answer

Soon as i turn on my heat my cooling fans come on first


It sounds like you do need a thermostat with your heat shut off and the gauge will raise a little then the car doesn't have that heat drawn from it indicating that you most likely do need a thermostat. As far as the fans coming on immediatly that could be a different problem it is most likely the coolant temperature sensor that tells the fan's when to come on. If this sensor says the coolant is hot the fans will come on immediatly. These are seperate problems as the coolant temperature sensor does not have anything to do with the cabin heating system. You should first check the level of your coolant is full, This could also cause your cabin heating system to perform poorly, and may have adverse effects to the engine cooling system. (fans)

Dec 31, 2009 | 1995 Nissan Maxima

1 Answer

How do you replace the fan motor in '03 jeep grand cherokee laredo? - the damn thing overheats when idle - changed the relay & coolant sensor... still overheating


When was the last coolant change?
Under 2 years or 24,000 miles.

Change the thermostat and gasket first.

Use a 195F with pop-let protection.

A stuck/failing thermostat is a common cause of over-heating problem.

======
To change the fan,the entire protector plastic has to come out.

Most likely you will break the push in locking pins.

Get few replacement push in locking pins before you start the job.


Dec 02, 2009 | 2003 Jeep Grand Cherokee

3 Answers

Toyota previa over heating


It could be the thermostat replac eto be sure but also check to make sure the cooling fan is coming on periodically observe engine idling after the motor warms up the fan should come on after 5 - 10 minutes idling if not replace either the fan relay or the coolant fan switch

Sep 18, 2009 | 1995 Toyota Previa

1 Answer

Coolant doesn't heat up!


the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

Nov 23, 2008 | 1994 Honda Accord

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