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My engine is overheating?

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the radiator is clogged-up or the water pump -could be airlock try bleeding it-could also be a blown head gasket, cracked head or block and intake leak
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Tuesday, September 24th, 2019 AT 7:56 PM (Merged)
Tiny
TREV240
  • MEMBER
  • 8 POSTS
  • 1998 CHEVROLET MALIBU
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
Both Fan fails to run and overheats.
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Tuesday, September 24th, 2019 AT 7:56 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, have you done any testing at the fan relays, underhood junction block? Two terminals on each relay should be hot all the time, unplug relay, use testlite.

If the voltage checks out, the computer may not be grounding the relay/s for some reason. Maybe the coolant temp sensor? Are there any codes?
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Tuesday, September 24th, 2019 AT 7:56 PM (Merged)
Tiny
TREV240
  • MEMBER
  • 8 POSTS
Do no know how to take off junction box cover. Both fans has a separate relay circuit thou, how can I test the fans to isolate failure. Is there a sensor that feeds both fans in paralllel?
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Tuesday, September 24th, 2019 AT 7:56 PM (Merged)
Tiny
AZORE22
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET MALIBU
I replaces the water pump, intake gasket, and the thermostat and my car will still over heat after I drive like 10 miles (if I take it slow)
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hello, did you check for coolant flow through the radiator before replacing anything? Does the radiator fan work? Do you think the temp gage is reading correctly?

If everything checks out, I'd have to think about an internal engine issue.
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
ANGELAZIM
  • MEMBER
  • 2 POSTS
  • 1998 CHEVROLET MALIBU
1998 Chevy Malibu 6 cyl 150000 miles

my car overheated today and the front floorboards seem to be wet what is the problem
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
That's an indication that your heater core is likely leaking. It's usually quite a large job but you could bypass it temporarily by connecting the heater hoses together but you won't have any heat that way.
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
ANGELAZIM
  • MEMBER
  • 2 POSTS
And how exactly would I go about connecting the hoses until I could get a heater core next week
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You check the hose sizes first. Some run 5/8 on one and 3/4 on the other. They sell connectors at the parts stores to accomodate this. Make sure the hoses aren't kinked anywhere when you do it.
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
CBOYSFANDO
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET MALIBU
  • 3.1L
  • V6
  • FWD
  • AUTOMATIC
  • 200,000 MILES
Replaced water pump and thermostat. Flushed out heater core still gets hot. Even turned on defroster to pull heat away and sometimes air does not get hot. Ever since water pump froze car overheats.
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

It sounds like you have a blown head gasket, Here is a couple of guides to help you confirm the problem.

https://www.2carpros.com/articles/head-gasket-blown-test

and'

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Please let us know what you find.

Cheers, Ken
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Wednesday, October 28th, 2020 AT 6:04 PM (Merged)
Tiny
RACOON2099
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET MALIBU
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 98,000 MILES
I had a friend mechanic work on my car. He put a sealant in my cooling system which clogged my cooling system right up. I'm overheating like crazy now. I need to know is there any way to get this stuff out of my cooling system? I have pulled the radiator countless times to have it cleaned out, and have replaced the thermostat a few times as well.
The last time I had the radiator cleaned there was almost no additive residue in it, but I'm still overheating. Another thing that is happening is the tempurature gauge is raising and lowering alot, one minute it will be just above the middle mark, then it will spike in the red, then back down again over and over. I am currently "burping the system" but the only access I have to the radiator is through the reserve tank. Please help! >= S
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Saturday, October 31st, 2020 AT 10:48 AM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Prestone makes a super flush kit. Its all powder. Call your local parts store. This stuff works great. Im not the type a person to push a product but this stuff is really good. Make sure you follow the instructions CAREFULLY!
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Saturday, October 31st, 2020 AT 10:48 AM (Merged)

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