I have a 2003 Jeep Grand Cherokee and the cooling (electric) fan won't run, various opinions have been cooling sensor, thermostat, resistor?? Fuse is good I checked that. Hear is what happened the temp gauge went from 210 degrees(normal) up to 240,then the check engine light came on,A/C started blowing warm air, I was at an idle with A/C on. I turned off A/C and jeep and let it sit for awhile. Temp went back to normal,light stayed on. Drove Jeep for 30 miles, light went off and A/C blowing cold again.The fan does NOT come on when A/C is on and I think it is supposed to, any thoughts or suggestions would be appreciated I can't afford a mechanic right now. Thanks in advance, Trudy
Welcome to Ultimate Subaru Message Board, my lurker friend!
 |
Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created. We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning ** Not an actual guarantee, but seriously, you probably won't regret it! Serving the Subaru Community since May 18th, 1998! |
Guest Message by DevFuse
Jeep problem-need advice
Started by
Twowagons
, Jul 19 2010 09:50 AM
4 replies to this topic
#2
john in KY
-
- Members
- 1,110 posts
1000+ Super USER!
- KY
Posted 19 July 2010 - 10:46 AM
The fan should work when the AC is on.
When the AC was blowing hot air this means it wasn't engaged. System could be low on refrigerant or the AC compressor could have gone off line because of the underhood temperature. Don't quote me on this but I think the compressor has a thermoswitch somewhere. When the compressor gets too hot, the switch turns off the compressor. I know my wagon will do this on very hot days and when I sit for 30 or more minutes with the engine just idling.
The fan has to have a relay somewhere. It may be failing.
Easy way to determine if the fan has not failed is to unplug it and then run 12volts to one side and ground the other. If the fan turns then you know it is not the problem.
When the AC was blowing hot air this means it wasn't engaged. System could be low on refrigerant or the AC compressor could have gone off line because of the underhood temperature. Don't quote me on this but I think the compressor has a thermoswitch somewhere. When the compressor gets too hot, the switch turns off the compressor. I know my wagon will do this on very hot days and when I sit for 30 or more minutes with the engine just idling.
The fan has to have a relay somewhere. It may be failing.
Easy way to determine if the fan has not failed is to unplug it and then run 12volts to one side and ground the other. If the fan turns then you know it is not the problem.
#3
bheinen74
-
- Banned
-
- 0 posts
Banned
- central Iowa
Posted 19 July 2010 - 03:32 PM
lots of things run the fan.
if you hook the two wire leads as said, and fan turns on and runs, then you know its a sensor or relay or fuse
There is a thermoswitch on your block
there s a temp sensor on your radiator.
then you have the relays
usually the thermoswitch goes haywire first, or you have fuses blown. check under the hood in fusebox, and check in compartment block of fuses. there may be 2 fuses for the fans
if you hook the two wire leads as said, and fan turns on and runs, then you know its a sensor or relay or fuse
There is a thermoswitch on your block
there s a temp sensor on your radiator.
then you have the relays
usually the thermoswitch goes haywire first, or you have fuses blown. check under the hood in fusebox, and check in compartment block of fuses. there may be 2 fuses for the fans
#4
Twowagons
-
- Members
- 324 posts
Eat, Live, Breath Subaru
- Montgomery
Posted 19 July 2010 - 05:07 PM
Thank you both, I will check those things first and let you know what I find.
#5
nipper
-
- Members
- 17,303 posts
Semi Elite Master of the
- Long Island NY
Posted 19 July 2010 - 05:18 PM
I think this fan is operated by the ECU. IUf this is true there is an aftermarket thermoswitch that can be purchased that just senses the temp of the radiator and turns on the fan.
It is not unusual for this type of fan control to go bad.
It is not unusual for this type of fan control to go bad.
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users
