What would cause my car to be overheating?

60

Asked by Dec 01, 2012 at 09:11 PM about the 1996 Pontiac Sunfire 2 Dr SE Coupe

Question type: Maintenance & Repair

I have replaced the thermostat(burped the system too), cooling fan motor, and cooling fan relay. I have no
coolant loss. I checked the oil, it is pure oil, but when I pull the dipstick out the oil drips off the dipstick more
than usual for oil to drip off. I can hear a slight chatter in the engine like the internal parts are not getting
lubricated properly. Has anyone ever seen or heard of an engine overheating because the oil went through
thermal breakdown? Could it be that my coolant gauge is faulty, and I need to replace the coolant temp sensor?
I would be doing some voltage and resistance diagnostics if i owned a voltmeter.

11 Answers

33,705

Does the coolin fan kick on when it starts toget hot? I have seen a few instances where the water pump starts to wear down and the space increases between the block face and the propeller fins. When this happens the coolant doesn't flow properly and prevents the cooling system from cooling. When does it typically overheat, when parked, highway driving, city driving, or all of the above.

4 of 4 people found this helpful.
1,115

Has your radiator ever been replaced or cleaned? Could be the radiator core is getting blocked so coolant is not flowing properly through the engine to pull the heat away from the engine.

3 of 3 people found this helpful.
60

the coolant fan kicks on. it will overheat at idle, driving down the highway, or stop and go driving. the radiator is good. i was actually thinking about throwing a new water pump on it, along with a fresh oil change. thanks everyone, i'm still open to other ideas though. this one has me pretty stumped.

4 of 4 people found this helpful.
33,705

When its cooled off and cold pull the radiator cap off and hit the gas to see if the coolant level lowers in the radiator. Don't over rev it or hold it for too long. Once you release the gas the coolant should come right back up to full.

2 of 2 people found this helpful.
7,035

are you using distilled water or tap? tap water tends to leave deposits in the system.; possibly blocking passage ways.

2 of 2 people found this helpful.
7,035

also.. some people just use coolant but no water. what is your mix?

2 of 2 people found this helpful.
1,415

"good radiator" make sure it not only holds pressure but the fins need to not be full of mud and bugs

1 of 1 people found this helpful.
60

i will only use distilled water with my mix. its winter where i live so i have a 70% coolant/30% distilled water mix. radiator is completely clean, fins are all good. i'm thinkin i was just a moron and didn't bleed all the air out of the system. again thank you all for the responses. i will update the status of the vehicle tomorrow.

2 of 2 people found this helpful.
7,035

distilled h2O is great! your engine will last longer that way. just make sure u open the bleeder valve and pour till coolant starts to bubble out.

Had a similar problem earlier this year. Changed the thermostats and radiator cap to fix problem. It is not a Pontiac but this works on most cars! Good luck!

I'm just a girl so what are you talking about? Once my car ran hot and my brother took the thing that looked like a top hat and cleaned all the leaves and other stuff that had blown in there out then my car cooled again. Do u think this could be it. I am having to take my car to a shop and I don't know what they r going to say. Can u help me?

Your Answer

Add photo

Related Questions

Sunfire

Looking for a Used Sunfire in your area?

CarGurus has 310 nationwide Sunfire listings starting at $3,975.

ZIP:

Search Pontiac Sunfire Questions

Pontiac Sunfire Experts

#1 John Saffrahn
John Saffrahn
Reputation 2,680
#2 Joeyadams
Joeyadams
Reputation 1,320
#3 Warren0007
Warren0007
Reputation 1,230
View All

Related Models For Sale

Used Chevrolet Cavalier
1,000 listings
Used Pontiac Firebird
12 Great Deals out of 724 listings starting at $3,990
Used Pontiac Grand Am
1,215 listings starting at $1,999
Used Toyota Camry
1,011 Great Deals out of 90,917 listings starting at $650
Used Pontiac Grand Prix
30 Great Deals out of 2,871 listings starting at $900
Used Chevrolet Camaro
225 Great Deals out of 30,943 listings starting at $1,217
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Impala
521 Great Deals out of 31,725 listings starting at $1,450
Used Honda Accord
813 Great Deals out of 84,287 listings starting at $1,050
Used Ford F-150
2,194 Great Deals out of 206,316 listings starting at $1,499

Used Cars For Sale

2005 Pontiac Sunfire For Sale
71 listings starting at $3,975

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.