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asatxj
September 14th, 2006, 09:56
My e fan runs all the time whether or not the ac or defrost is on which leads me to think that the CTS is bad. But the temp gauge works just fine. Anyone have some idea here? Is there a relay that I don't know about??
TIA
Blaine B.
September 14th, 2006, 11:57
What temperature is your engine running at?
langer1
September 14th, 2006, 12:20
My e fan runs all the time whether or not the ac or defrost is on which leads me to think that the CTS is bad. But the temp gauge works just fine. Anyone have some idea here? Is there a relay that I don't know about??
TIA

What year? Some are controlled by the CTS and others are not.
BTW there are 2 CTS's the gage has it own and the engine has it's own.
xjbubba
September 14th, 2006, 13:45
My '88 4.0 had a sensor for the fan mounted in the radiator, separate from the engine temp sensors for the gauge and ECM input.
asatxj
September 14th, 2006, 14:06
Sorry, I was in between classes and didn't have time to type it all
99 sport
4.0l
84k miles
temp gauge shows 210*+- (normal) for daily driving and in heat.
The Efan runs from the minute I start it, it may go off for a few seconds but never more than that.
langer1
September 14th, 2006, 14:45
It runs with the A/C and defrost also.
90xj06
September 14th, 2006, 16:00
does it come on right when you put the key on??? it may be a bad relay but would that keep it on with the key off. also there may be a little ait in it.
jneary
September 14th, 2006, 18:16
sounds like the relay is shorted
Jess
September 14th, 2006, 19:28
Sending unit for the e fan is in the thermostat housing. Control for the fan is not linked with the temp sending unit for the gague.
asatxj
September 15th, 2006, 02:50
It comes on about 5 sec after the key is turned on. I'll check the relay when I check out the FSM and find it.
Dr. Dyno
September 15th, 2006, 03:21
My e fan runs all the time whether or not the ac or defrost is on which leads me to think that the CTS is bad. But the temp gauge works just fine. Anyone have some idea here? Is there a relay that I don't know about??
TIA

The fan is triggered by a relay that sits behind the driver's side headlight housing. It sounds like that relay's stuck on the "on" position so replace it.
Blaine B.
September 15th, 2006, 13:13
Or just swap them around, there should be another one there for highbeams/fogs.....see if it works then!