94 Chevy S-10 Overheating

BRAD04

MEMBER
1994 CHEVROLET S-10
4 CYL
2WD
MANUAL
216,000 MILES

My 94 S10 is still running hot. Have replaced thermostat (twice), water pump, radiator, radiator cap, temp sensor and blown head gasket.(Head pressure tested fine) Fan seems to be working fine. When this started water was boiling over out of resevior. Thats not happening after changing radiator. But temp gauge still going up to 240-250 before dropping back down.
Seems to run fine with thermoatat out. But thats not a fix. Someone on here said to bleed system, hubby said he did that already. Will do again tomorrow.
Any other suggestions? Already $500 into repairs and he wants to junk it and buy something else, which we can't afford right now.

3 Replies

HMAC300

MECHANIC
48,601 POSTS

Check the overheating manually if you have one of those temp gauges that you push a button and check or put a manual gauge on it. It may be a bad sender or bad ground and making it look likeit's overheating when it's not. Also if you put silicone on the sensor it might not make it work right. They usually have sealer already on them so nothing is needed. Check to make sure your grounds ont eh engine are clean andtight.

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Friday, December 17th, 2010 AT 11:31 PM

BRAD04

MEMBER
6 POSTS

Thanks for the response. I think we finally got it. He had put teflon tape on the sensor which like you said doesn't need to be done anymore. Got another sensor and changed the fan clutch just because we couldn't think of anything else to try. Between those two it seems to be running fine. Temp is running a little higher than it used too but holding steady. Thanks again!

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Saturday, December 18th, 2010 AT 3:03 AM

HMAC300

MECHANIC
48,601 POSTS

Teflon tape is ok but if you are going to use any kind of sealer get the loctite white teflon dope. They also own permatex so that would the same or something similar. I forgot about clutch fans as most have electric now. But that may have been your problem, but remember with a clutch fan after about 30 mph they don't work to well. But yo have it fixed and that's the big thing.

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Saturday, December 18th, 2010 AT 2:24 PM