Suburban runs hot over 45mph

Asked by Pappy43 Aug 16, 2020 at 08:46 AM about the 2004 Chevrolet Suburban 1500 LT 4WD

Question type: Maintenance & Repair

2004 Suburban, 135k miles, is suddenly
running hot at 235 (doesn’t ever exceed that
temp per the gauge) when traveling above 45
mph. When idle or regular city driving temp is
normal and steady at 210. Fan working
properly, AC cold, heat hot, coolant level ok. I
see no external leaks, oil is clean, no signs of
head gasket issue. Coolant is 2 years old.
Engine power is good, no rough idle. Thinking
of changing thermostat as it’s easy and cheap
fix. Next would be the sensor. Any other
ideas?

2 Answers
155,425

james answered 3 years ago

This is poor coolant circulation. My first thought is the thermostat is not opening all the way. After that, restricted coolant passages in the engine. When was the last time the cooling system was flushed? Then the water pump. Hope that helps! Jim

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Suburban runs hot over 45mph 2 Answers

    2004 Suburban, 135k miles, is suddenly running hot at 235 (doesn’t ever exceed that temp per the gauge) when traveling above 45 mph. When idle or regular city driving temp is normal and steady at ...

    2004 Chevrolet Suburban 1500 LT 4WD

    -

    Maintenance & Repair

  • Suburban wont crank over 1 Answer

    I own a 20002 suburban 1500 5.3L. Just replaced fuel pump, fuel filter, and new battery. Truck still won't crank over. Is there another pump on engine to pull fuel up to crank up. What other th...

    2002 Chevrolet Suburban 1500 LT 4WD

    -

    Maintenance & Repair

  • Suburban won't turn over 3 Answers

    A few weeks ago I started having issues with starting that I guessed was a dead battery because it was below zero weather. That starter would click and kindof act like a low battery. I thought it w...

    2002 Chevrolet Suburban 1500 LT 4WD

    -

    Maintenance & Repair

  • 2008 Suburban turns over but won't start 2 Answers

    My Suburban turns over but won't statt. My husband did something to it so I couldn't drive it. Not sure where to start to fux the problem. Could it be fuse? I'm thinking something is unplugged. No...

    2008 Chevrolet Suburban 1500 LTZ 4WD

    -

    Maintenance & Repair

  • Suburban won't turn over 1 Answer

    We originally started having issues with our '05 Suburban shutting off when going around sharp curves or turns at a slow rate of speed. We knew the power steering pump needed to be replaced anyway...

    2005 Chevrolet Suburban 1500 Z71 4WD

    -

    Maintenance & Repair

Shortcuts

Search Chevrolet Suburban Questions

CarGurus Experts

  • #1
    Andrew Olsen
    Reputation
    3,080
  • #2
    JimO65
    Reputation
    2,390
  • #3
    Rowefast
    Reputation
    2,130
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Yukon XL
11 Great Deals out of 721 listings starting at $9,999
Used Chevrolet Tahoe
17 Great Deals out of 773 listings starting at $7,499
Used Ford Expedition
16 Great Deals out of 601 listings starting at $3,966
Used GMC Yukon
16 Great Deals out of 962 listings starting at $6,900
Used Cadillac Escalade ESV
7 Great Deals out of 162 listings starting at $8,500
Used Cadillac Escalade
16 Great Deals out of 442 listings starting at $11,495
Used Chevrolet Silverado 1500
165 Great Deals out of 7,206 listings starting at $6,995
Used Toyota Sequoia
4 Great Deals out of 57 listings starting at $19,990
Used Lincoln Navigator
10 Great Deals out of 297 listings starting at $23,945
Used Ford F-150
305 Great Deals out of 13,676 listings starting at $3,888
Used Chevrolet Silverado 2500HD
28 Great Deals out of 1,540 listings starting at $509
Used GMC Sierra 1500
141 Great Deals out of 7,708 listings starting at $4,944
Used Toyota 4Runner
17 Great Deals out of 522 listings starting at $7,700
Used Toyota Sienna
44 Great Deals out of 576 listings starting at $2,499

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. Content will be removed if CarGurus becomes aware that it violates our policies.