what makes temp guage bounce around

45

Asked by Mar 13, 2007 at 08:37 AM about the 1991 GMC Sonoma 2 Dr SLE 4WD Standard Cab SB

Question type: Maintenance & Repair

vehicle has 422,000 miles and temp guage bounces from max temp to middle temp to normal temp and continues on and on. vehicle is running at normal temp while this happens and i checked electrical connections.

6 Answers

33,065

Not sure what else it could be other than an electrical malfunction if you are sure that the vehicle is in fact not over heating and running at normal temperature. 422,000! Wow. You must really have pampered that machine. Thats amazing.

25

change out the thermostat...easy fix.

1 of 1 people found this helpful.
3,405

A broken thermostat wouldn't cause the gauge to bounce around......... The water temp sensor is probably dead or dieing. Find out where it is and replace it.

340

Do this test: Ground out the thermostat lead. If the gauge goes to max, it's the sending unit. If it does nothing, the issue is the gauge or wiring.

1 of 1 people found this helpful.
265

WOW 422 000 YOU SHOULD GET A HOLD OF GM AND SEE IF TH NEED A MUSEUM PEICE TO SHOW OFF THE LONGIVITY OF THE S10 LOL I WOULD DO EXACTLY WHAT BUDDY SAID ABOUT GROUNDING OUT THE UNIT HES RIGHT BUT GM MECHANICAL GUAGES ALWAYS BOUNCE AROUND ESPECIALLY WHEN THY GET OLDER AND HAVE LOTS OF MILES ON IT YOULL PROBALLY END UP CHANGING TE TEMP SENSOR AND GAUGE

35

well I doubt its the timing. Could be possible that you have a clogged radiator, or a sediment built up in the engine block

1 of 1 people found this helpful.

Your Answer

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has 403 nationwide Sonoma listings starting at $2,150.

ZIP:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    700
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
14 Great Deals out of 1,207 listings starting at $1,550
Used Ford Ranger
169 Great Deals out of 5,392 listings starting at $1,250
Used GMC Sierra 1500
1,108 Great Deals out of 64,989 listings starting at $1,750
Used Ford F-150
2,779 Great Deals out of 212,021 listings starting at $1,300
Used Dodge Dakota
92 Great Deals out of 3,603 listings starting at $1,800
Used Chevrolet Blazer
3 Great Deals out of 928 listings starting at $950
Used GMC Yukon
582 Great Deals out of 22,142 listings starting at $2,145
Used Ford Mustang
546 Great Deals out of 36,468 listings starting at $1,500

Used Cars For Sale

2003 GMC Sonoma For Sale
92 listings starting at $3,697
2002 GMC Sonoma For Sale
48 listings starting at $3,495
2001 GMC Sonoma For Sale
66 listings starting at $2,500
2000 GMC Sonoma For Sale
59 listings starting at $3,995
1999 GMC Sonoma For Sale
35 listings starting at $2,150

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.