how to replace temperature sensor on a Pontiac 3.8 liter engine

Asked by Oct 28, 2014 at 09:42 PM about the 1999 Pontiac Grand Prix

Question type: Maintenance & Repair

cooling fans will not turn on no matter how hot the car yet if I
disconnect the temperature sensor plug the cooling fans will turn
onwith the engine running if I connect the plug back the fans will stay
on until I shut the car off when I restart fans will not turn on + air
conditioning is not working eitherwhen I try to turn AC on you do not
hear the clutches in the compressor engageand before I had work
done to my car the AC and the temperature gauge and fans work
properly that is how I got the car backit sounds like an electrical
problem or the e_c mI don't know but please any helpful information
would be appreciated it is giving me a headache I do not trust
mechanics anymore

4 Answers


Check the fan relay?

Best Answer Mark helpful

And on the ac,,check fuse,s and ac relay.

2 of 2 people found this helpful.

I forgot to list I also had my ECM reflashed so I believe there might be a problem with the ECM not communicating with the body module and there is also a fuse it is a 15 amp ignition fuse it is position 21 in the under hood fuse block I am NOT getting any power to either side of that fuse checked with meter checked with test light no voltage going to. The fuse is not blown can you please tell me where the source voltage comes from any help would be appreciated thank you for your reply


Fuse Position # 21 should be TRANS SOL - Torque Converter Clutch (TCC)

1 of 1 people found this helpful.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,457 nationwide Grand Prix listings starting at $950.


Pontiac Grand Prix Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Chevrolet Impala
559 Great Deals out of 33,307 listings starting at $1,499
Used Pontiac Bonneville
440 listings starting at $1,500
Used Chevrolet Malibu
1,067 Great Deals out of 57,948 listings starting at $995
Used Chevrolet Monte Carlo
7 Great Deals out of 1,220 listings starting at $1,125
Used Ford Mustang
431 Great Deals out of 41,722 listings starting at $1,488
Used Pontiac Grand Am
975 listings starting at $2,595
Used Chevrolet Camaro
506 Great Deals out of 30,983 listings starting at $995
Used Nissan Maxima
348 Great Deals out of 20,620 listings starting at $1,175
Used Honda Accord
916 Great Deals out of 77,851 listings starting at $1,295
Used Pontiac Firebird
9 Great Deals out of 720 listings starting at $1,649

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
6 Great Deals out of 414 listings starting at $2,250
2007 Pontiac Grand Prix For Sale
334 listings starting at $2,400
2006 Pontiac Grand Prix For Sale
420 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
3 Great Deals out of 343 listings starting at $950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.