none of my fans work

boyesreef · 04-15-2009, 03:37 PM

coming home from work today, the roads were busy and slow. my dash has only idiot lights, no guages. get home i can hear the coolent bubbleing into the overflow, and out of the radiator cap. the mechanicle fan dosnt work, figured that out cause it spins while hot with no resistance. the electric fan never kicked on, and the dash light never cane on. put a tester on it, good ground, and no power with key on at the fan plug in. jumper the fan to the battery it kickes on. jump the leads at the plug on the themp sensor switch on top of the engine, nothing. after that i was too irritated to try testing the wires for ground and power past that point. i have the chilton manuel coming in the mail, but its not here yet.

thanks for the help in advance.

boyesreef · 04-15-2009, 08:28 PM

anyone? come on guys, i cant really drive this thing as is, i need help

89PBR96 · 04-15-2009, 08:31 PM

Did you check your fuses also there is problly a inline fuse on the fan sounds like you have a bad power wire / fuse blown you might have to wire the fan direct to ignition if you cannot find the problem that way when you turn your jeep on the fan is on had to do that to a ranger i had good luck

96 XJ Sport · 04-15-2009, 10:35 PM

Sorry, I'm not much help on the electrical fan, but I would at least replace the clutch on the mechanical fan. It will probably get you by good enough to drive it while you figure out the electrical fan issue.

boyesreef · 04-16-2009, 12:48 AM

if i wire the fan to the ignition wont it over cool in the winter? i would replace the mechanicle clutch, but i havent worked since october. f*** michigans economy, starting a job soon though. ill check fuses, i really hope its another missing fuse like the dome/radio was.

boyesreef · 04-16-2009, 01:13 AM

and as far as the mechanicle fan goes, i was thinking of replacing it with a second electric fan. what do you think?

solderjunkie · 04-16-2009, 07:37 AM

You should have a cooling fan relay in the PDC.

The relay gets it's ground from a driver in the JTEC based on A/C inputs and engine coolant temp.

Swap the relay from the A/C compressor and retest.

boyesreef · 04-16-2009, 10:32 AM

thanks solderjunkie, ill give it a try. this is the first time its been warm enough for me to realize i have no fans, i drove 2 hours one way to family, and it wasnt overheating when i got there, but it was 37.

96 XJ Sport · 04-16-2009, 11:04 AM

Quote:

Originally Posted by boyesreef

and as far as the mechanicle fan goes, i was thinking of replacing it with a second electric fan. what do you think?

I wouldn't personally. It would be easier and cheaper (I think) to replace that fan clutch. They are like $30-$40 at AZ. Also, it feels like my mechanical fan pushes much more CFMs than the electric fan, especially when it increases speed with the engine.

boyesreef · 04-16-2009, 11:10 AM

i didnt realize they were that cheap, for an 85 bonneville, they are about $100

boyesreef · 04-19-2009, 03:02 PM

ok, i replaced the fan clutch. $50 was the cheapest i could find. tested the relay for the E. fan, it was good, but when i tested the coolent sensor, it was bad, so i replaced that and the radiator cap as well. i still dont know if the fan works, it hasnt been warm enough. it doesnt come on with the a/c, but then again niether does the a/c clutch.

04-15-2009, 03:37 PM	#1
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	none of my fans work coming home from work today, the roads were busy and slow. my dash has only idiot lights, no guages. get home i can hear the coolent bubbleing into the overflow, and out of the radiator cap. the mechanicle fan dosnt work, figured that out cause it spins while hot with no resistance. the electric fan never kicked on, and the dash light never cane on. put a tester on it, good ground, and no power with key on at the fan plug in. jumper the fan to the battery it kickes on. jump the leads at the plug on the themp sensor switch on top of the engine, nothing. after that i was too irritated to try testing the wires for ground and power past that point. i have the chilton manuel coming in the mail, but its not here yet. thanks for the help in advance.

04-15-2009, 10:35 PM	#4
96 XJ Sport Seasoned Member Join Date: Sep 2008 Location: Bardstown, KY Posts: 430 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0L Transmission: AW4 Transfer Case: NP231 Front Axle: D30 Rear Axle: 8.25 Tires: 225/75/15 Lift Specifications: none yet	Sorry, I'm not much help on the electrical fan, but I would at least replace the clutch on the mechanical fan. It will probably get you by good enough to drive it while you figure out the electrical fan issue. __________________ Eric 96 XJ Sport - 4.0 AW4 231 8.25 RE 3.5" SF lift RE HnT SYE 31" General Grabber AT2s

04-16-2009, 07:37 AM	#7
solderjunkie Seasoned Member Join Date: Apr 2009 Location: Nashville TN Posts: 470 My Photos	You should have a cooling fan relay in the PDC. The relay gets it's ground from a driver in the JTEC based on A/C inputs and engine coolant temp. Swap the relay from the A/C compressor and retest. __________________ Don't guess... TEST

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04-15-2009, 08:28 PM	#2
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	anyone? come on guys, i cant really drive this thing as is, i need help

04-15-2009, 08:31 PM	#3
89PBR96 Senior Member Join Date: Apr 2009 Location: central IL Posts: 846 My Photos 01 Cherokee Year: 01 Model: Cherokee Engine: 4.0 Transmission: A/T Transfer Case: 231 Front Axle: Dana 30 Rear Axle: Dana 35 Lift Specifications: 3" Rustys	Did you check your fuses also there is problly a inline fuse on the fan sounds like you have a bad power wire / fuse blown you might have to wire the fan direct to ignition if you cannot find the problem that way when you turn your jeep on the fan is on had to do that to a ranger i had good luck

04-16-2009, 12:48 AM	#5
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	if i wire the fan to the ignition wont it over cool in the winter? i would replace the mechanicle clutch, but i havent worked since october. f*** michigans economy, starting a job soon though. ill check fuses, i really hope its another missing fuse like the dome/radio was.

04-16-2009, 01:13 AM	#6
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	and as far as the mechanicle fan goes, i was thinking of replacing it with a second electric fan. what do you think?

04-16-2009, 10:32 AM	#8
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	thanks solderjunkie, ill give it a try. this is the first time its been warm enough for me to realize i have no fans, i drove 2 hours one way to family, and it wasnt overheating when i got there, but it was 37.

04-16-2009, 11:10 AM	#10
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	i didnt realize they were that cheap, for an 85 bonneville, they are about $100

04-19-2009, 03:02 PM	#11
boyesreef Member Join Date: Mar 2009 Posts: 161 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0L Power Tech I-6 Engine H.O. Transmission: 4-Speed Automatic AW4 Transmission Transfer Case: Command-Trac Part Time 4WD System Front Axle: Dana M30/181MM Front Axle Rear Axle: Corporate 8.25 Rear Axle Tires: P225/75/R15 Lift Specifications: 3.55 Axle Ratio Misc Accessories: underbodied from the bumperline down	ok, i replaced the fan clutch. $50 was the cheapest i could find. tested the relay for the E. fan, it was good, but when i tested the coolent sensor, it was bad, so i replaced that and the radiator cap as well. i still dont know if the fan works, it hasnt been warm enough. it doesnt come on with the a/c, but then again niether does the a/c clutch.

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