Cooling fans

Tiny
CARFOOL
  • MEMBER
  • 1996 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 162 MILES
Put new temp sending cener in fans wont work. Unplug the cener and both fans turn on. Is there another cener?
Do you
have the same problem?
Yes
No
Thursday, April 14th, 2011 AT 6:24 PM

10 Replies

Tiny
JDL
  • EXPERT
What is the temp gage showing, in degrees? Is it overheating? Low speed fan won't come on till about 220.

Some systems, the fan will run if you unplug the cts. It also may turn on when ac is on. Any applicable trouble codes?
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 8:47 PM
Tiny
CARFOOL
  • MEMBER
The gage only gose to 220 it is at 220still dont turn on
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 9:09 PM
Tiny
JDL
  • EXPERT
If it overheats, it will pop the radiator cap, where applicable, and the reservoir will fill up in a hurry. I looked at your owners manual, the temp gage goes to 260 degrees F. Give me a minute to look around.
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 9:30 PM
Tiny
JDL
  • EXPERT
Any applicable trouble codes?

In the diagram, the black wire at motors 1 and 2 are grounds. Fan 1, lite blue wire is voltage. Fan two, white wire is voltage. The ground for the coil side of relay/s is controlled by pcm. No ground, the relay won't energize.
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 9:46 PM
Tiny
CARFOOL
  • MEMBER
It went as high as 240 or more still no fan
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 10:05 PM
Tiny
JDL
  • EXPERT
You still need to check for trouble codes. Turn on the ac, the fan should run, till you figure it out. Check the circuits at the fan relay. I gave you the diagram.
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 10:25 PM
Tiny
CARFOOL
  • MEMBER
Thanks
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 10:28 PM
Tiny
JDL
  • EXPERT
Let us know what you find?
Was this
answer
helpful?
Yes
No
Thursday, April 14th, 2011 AT 10:57 PM
Tiny
JDL
  • EXPERT
Another thought, use a digital multimeter on the yellow wire at the coolant temp sensor.

With the connector plugged in, backprobe the yellow wire, hot engine running, what is the reading?
Was this
answer
helpful?
Yes
No
Friday, April 15th, 2011 AT 1:40 PM
Tiny
JDL
  • EXPERT
To check for codes, at the least, you need an obd2 code reader.
Was this
answer
helpful?
Yes
No
Friday, April 15th, 2011 AT 1:42 PM

Please login or register to post a reply.

Recommended Guides