CTS bad?

A

asatxj

NAXJA Forum User

Location

Grant, Michigan

• Sep 14, 2006

• #1

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

 

B

Blaine B.

NAXJA Forum User

Location

Northwest Indiana

• Sep 14, 2006

• #2

What temperature is your engine running at?

 

langer1

NAXJA Forum User

Location

Mineral City,Ohio

• Sep 14, 2006

• #3

asatxj said:

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

Click to expand...

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.

 

X

xjbubba

NAXJA Member # 1524

Location

santa barbara, ca

• Sep 14, 2006

• #4

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.

 

A

asatxj

NAXJA Forum User

Location

Grant, Michigan

• Sep 14, 2006

• #5

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

NAXJA Forum User

Location

Mineral City,Ohio

• Sep 14, 2006

• #6

It runs with the A/C and defrost also.

 

9

90xj06

NAXJA Forum User

Location

Peabody, MA

• Sep 15, 2006

• #7

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.

 

J

jneary

NAXJA Forum User

Location

springfield, virginia

• Sep 15, 2006

• #8

sounds like the relay is shorted

 

J

Jess

NAXJA Forum User

Location

Tennessee

• Sep 15, 2006

• #9

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.

 

A

asatxj

NAXJA Forum User

Location

Grant, Michigan

• Sep 15, 2006

• #10

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.

 

D

Dr. Dyno

NAXJA Forum User

Location

Al Ain, UAE

• Sep 15, 2006

• #11

asatxj said:

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

Click to expand...

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.

 

B

Blaine B.

NAXJA Forum User

Location

Northwest Indiana

• Sep 15, 2006

• #12

Or just swap them around, there should be another one there for highbeams/fogs.....see if it works then!