electric fan problem

X

XJadam

NAXJA Forum User

Location

Schaumburg, IL

• Sep 30, 2009

• #1

Ok heres the deal. On my 99 2door XJ, my electric fan will not turn on when the jeep gets hot. However it will turn on when I turn the heat on.

SO......I know that the fan works however, I am not sure why it is doing what it is doing. Is some type of relay broken? I would like to fix this but I am not sure where to start.

Any help would be great.

Thank you in advance


Adam

 

hubs97xj

NAXJA Forum User

Location

Fort Wayne, IN

• Sep 30, 2009

• #2

The fan should come on with the AC, defrost mode, or when the coolant temp reaches ~218. Are you sure it's coming on with the heat, and not the defroster? How hot is the Jeep getting without the fan coming on?

 

A

AJTorris

NAXJA Forum User

Location

California

• Sep 30, 2009

• #3

Mine did basically the same thing but wouldnt come on at all but would if i jumped it to the battery so i wired it into a toggle..

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Sep 30, 2009

• #4

Turning on heat should not make the radiator efan come on. And the efan doesn't come on anyway until it gets real hot. Like 217.

 

X

XJadam

NAXJA Forum User

Location

Schaumburg, IL

• Oct 1, 2009

• #5

yes the defrost was on. My temp guage was in the middle, pointing straight up. It has never gotten that hot. Usually the fan will turn on when it is close to straight up. I know something is cooking, because I smell coolant

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Oct 1, 2009

• #6

Isn't temp gage in the middle good? Mine (IIRC) is 210. Coolant smell may be a leak. With defrost on does your windshield steam up? That means a leaky heater core. Hopefully not your issue.

 

T

tragiccomic1972

NAXJA Forum User

Location

Snow Camp NC

• Oct 1, 2009

• #7

replace the engine coolant temp sensor.... the one in the water neck housing... that should fix you right up... mine did the same thing

 

gradon

NAXJA Forum User

Location

DC

• Oct 1, 2009

• #8

As wb said, straight up is 210, so it shouldn't come on until it gets past that. The cts in the t-stat housing tells the pcm what the temp is, which then tells the fan to turn on or not.