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1999 Pontiac Grand Prix temp. Gauge and radiator fan not wo

Tiny
TSOG29
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Hi, I just bought a 99 grand prix gt, driving it for a while notice that the temperature gauge is not working at all. The radiator fan is not even working, I turned on the a/c to the max and the fan is not even turning on. So, I check the relays and fuses but they are all good. Im kinda in a hole right now because both of them are not working fan and temp. Gauge at the same time. Im afraid that it might over heat without me even knowing it and damage the vihicle. Any suggetion would greatly be appritiated. Thank you very much.
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Wednesday, February 6th, 2008 AT 12:51 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Find the temperature switch for the gauge and also the coolant temperature sensor test its resistances hot and cold.

Problem might be also the computer not getting a signal from the CTS and not activating the relays.
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Wednesday, February 6th, 2008 AT 1:16 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Get a voltmeter or test light and pull the connector off the fan motor, check for voltage! You can also run two wires from the battery, one from each post, touch them to the fan terminals, does fan operate? Keep us posted.
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Wednesday, February 6th, 2008 AT 10:03 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
See below EWD for the fan/s


https://www.2carpros.com/forum/automotive_pictures/12900_c3_1.jpg




https://www.2carpros.com/forum/automotive_pictures/12900_cf2_1.jpg

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Wednesday, February 6th, 2008 AT 11:23 AM

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