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Fan wont turn on I changed sending unit and temperature gauge is not showing hot

Tiny
DAVID TUCKER
  • MEMBER
  • 1995 CHEVROLET CAVALIER
  • 2.2L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 272,134 MILES
My fan works with AC and when I unplug the temperature sending unit.
Saturday, October 1st, 2016 AT 4:10 PM

11 Replies

Tiny
DAVID TUCKER
  • MEMBER
  • 5 POSTS
I did change sending unit and temperature gauge is not showing hot.
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Saturday, October 1st, 2016 AT 4:13 PM
Tiny
CARADIODOC
  • MECHANIC
  • 33,871 POSTS
What problem are you trying to solve? A lot of GM engines need to get to around 220 - 224 degrees before the radiator fan turns on. Unplugging the 2-wire sending unit and the fan turns on proves the system is working.
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Saturday, October 1st, 2016 AT 5:57 PM
Tiny
DAVID TUCKER
  • MEMBER
  • 5 POSTS
I understand that, but it seems like it is running hot idle over thirty minutes or more is that normal?
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Saturday, October 1st, 2016 AT 9:58 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Most of them are programmed even higher than that Doc. 227 is average. If the fan turns on when you unplug the CTS, the system is working fine.
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Sunday, October 2nd, 2016 AT 11:09 AM
Tiny
DAVID TUCKER
  • MEMBER
  • 5 POSTS
Okay, just going to ride around and find out if seems good.
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Sunday, October 2nd, 2016 AT 1:11 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
If it is taking a long time to warm up you might have a bad thermostat.
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Sunday, October 2nd, 2016 AT 1:11 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
If will generally set a P0128 of the T-stat is stuck open.
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Sunday, October 2nd, 2016 AT 1:14 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Not on a 1995 GM car. I know we are used to working on later model cars with that code. Lol.
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Sunday, October 2nd, 2016 AT 1:16 PM
Tiny
DAVID TUCKER
  • MEMBER
  • 5 POSTS
It seems to be doing good I have changed thermostat.
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Sunday, October 2nd, 2016 AT 2:00 PM
Tiny
DAVID TUCKER
  • MEMBER
  • 5 POSTS
Well, I changed that after I put new head gasket on it.
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Sunday, October 2nd, 2016 AT 2:01 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Glad to hear it. We love to hear happy endings.
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Sunday, October 2nd, 2016 AT 2:03 PM

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