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1989 Jaguar XJS False high heat reading

Tiny
DHAYNES
  • MEMBER
  • 1989 JAGUAR XJS
  • V12
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
The dash heat gage quickly goes to a high heat reading. If I open the hood - the engine does not seem overly hot. The electric cooling fan does not engage - so either the fan is not working, or it does not sense it is hot enough to kick in. Could this be a relay or temp sending unit, or?
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Sunday, April 19th, 2009 AT 12:25 PM

3 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Do you have a digital or analog dash? Also, does the the temp indicator jump imediately or gradually? Please advise.
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Sunday, April 19th, 2009 AT 1:43 PM
Tiny
DHAYNES
  • MEMBER
  • 2 POSTS
It is analog. The gage goes up fairly slowly - then very fast and sometimes rather jumpy.
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Sunday, April 19th, 2009 AT 1:58 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
I have to believe it's a problem with the temp sending unit. If you unplug the single wire connector to the sender, the gauge should go to "0". If yes, change the unit.


https://www.2carpros.com/forum/automotive_pictures/248092_89_XJS_temp_1.jpg



https://www.2carpros.com/forum/automotive_pictures/248092_89_XJS_temp_1_1.jpg

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Sunday, April 19th, 2009 AT 4:58 PM

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