Overheating

Asked by Aug 19, 2019 at 09:12 PM about the 1991 Chevrolet S-10

Question type: Maintenance & Repair

I have a 91 S10 2.5 motor I have flushed it
completely and replaced the thermostat why is it
still overheating

4 Answers

235,555

Did you purge air out of the system?

1 people found this helpful.
390

Many things can cause an overheating problem. The most common is loosing antifreeze while in operation. A weak radiator cap not holding correct pressure or reservoir cap. bad clutch fan or electric fan not working properly or at all. Other leaks in the cooling system such as bypass hose, heater core hose or unit, oil cooler hose and so on. Replace the radiator cap and check for coolant leaking out at operating temp as well as fan operation. check exhaust for smell of coolant when started cold, check oil fill cap for milky residue or excessive moisture. Pray it isn't a blown head gasket from a past overheating situation.

1 people found this helpful.
390

Yes F_O_R is correct on this one this time. You must permit the cooling system to purge as you fill the radiator don't just fill it and cap it. Give the antifreeze time to recede in the radiator as you fill it. Wait a few minutes and fill as it recedes. When you think it is no longer receding wait about 20 minutes to be sure and install the cap . Run to operating temperature, let it cool a few hours and check it is full.

1 people found this helpful.
117,125

If your heater is blowing cool air too that's an indication of air trapped in the cooling system or a bad water pump. Hope that helps! Jim

Your Answer:

S-10

Looking for a Used S-10 in your area?

CarGurus has 5 nationwide S-10 listings and the tools to find you a great deal.

Postal Code:

Chevrolet S-10 Experts

  • #1
    Andrew Olsen
    Reputation
    5,420
  • #2
    Js08016
    Reputation
    2,010
  • #3
    Trebor66
    Reputation
    1,950
View All

Find great deals from top-rated dealersTM

Search

Related Models For Sale

Used Ford Ranger
4 Great Deals out of 1,091 listings starting at $3,950
Used GMC Sonoma
1 listing
Used Ford F-150
127 Great Deals out of 14,218 listings starting at $2,000
Used Chevrolet Blazer
1,256 listings starting at $35,900
Used Dodge Dakota
94 listings starting at $4,995
Used Chevrolet Camaro
34 Great Deals out of 1,112 listings starting at $9,950
Used GMC Sierra 1500
64 Great Deals out of 13,294 listings starting at $3,995

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.