what makes temp guage bounce around

35

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

32,685

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.
3,365

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.

330

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 431 nationwide Sonoma listings starting at $1,000.

ZIP:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    680
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
8 Great Deals out of 1,216 listings starting at $2,500
Used Ford Ranger
165 Great Deals out of 5,472 listings starting at $1,499
Used GMC Sierra 1500
880 Great Deals out of 65,423 listings starting at $1,995
Used Ford F-150
2,277 Great Deals out of 181,620 listings starting at $1,000
Used Dodge Dakota
115 Great Deals out of 3,671 listings starting at $1,700
Used Chevrolet Blazer
1,045 listings starting at $950
Used GMC Jimmy
233 listings starting at $1,950
Used Chevrolet C/K 1500
4 Great Deals out of 858 listings starting at $2,000

Used Cars For Sale

2003 GMC Sonoma For Sale
3 Great Deals out of 107 listings starting at $2,500
2002 GMC Sonoma For Sale
74 listings starting at $3,450
2001 GMC Sonoma For Sale
64 listings starting at $2,800
1999 GMC Sonoma For Sale
23 listings starting at $1,950

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.