Overheating

cre · 03-11-2010, 01:32 AM

13psi on the radiator cap, and just because that's what the package says doesn't mean it's right... ALWAYS test new thermostats and radiator caps... it's too critical of a system not to.

I'm doubtful of it being the thermostat myself.

Test the coolant for acidity too, if it's a blown HG (which doesn't necessarily mean the oil is getting contaminated) the coolant system may be getting pumped full of exhaust gasses.

Check the radiator for blockages.

comatoseguitar · 03-11-2010, 04:47 AM

i had an overheating prob on my 89. ended up being the head gasget. the gasget failed right near a coolant port and was shoving air into the coolant and formed an air bubble under the therm. and caused the coolant to boil off and overheat.

MA70-3.0GT · 03-11-2010, 05:26 PM

Id have to say its likely hg. Do the check for acidity mentioned and see, also does your heater work? Most airlocks tend to be around the heater core and back of the head. Gurgling/waterfall sound could be another clue.
Hope im way off and its simple but my moneys still firmly on hg...

03-11-2010, 01:32 AM	#1
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	13psi on the radiator cap, and just because that's what the package says doesn't mean it's right... ALWAYS test new thermostats and radiator caps... it's too critical of a system not to. I'm doubtful of it being the thermostat myself. Test the coolant for acidity too, if it's a blown HG (which doesn't necessarily mean the oil is getting contaminated) the coolant system may be getting pumped full of exhaust gasses. Check the radiator for blockages. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

03-11-2010, 05:26 PM	#3
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Id have to say its likely hg. Do the check for acidity mentioned and see, also does your heater work? Most airlocks tend to be around the heater core and back of the head. Gurgling/waterfall sound could be another clue. Hope im way off and its simple but my moneys still firmly on hg... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

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03-11-2010, 04:47 AM	#2
comatoseguitar Stock Join Date: Mar 2010 Location: omaha ne Posts: 3	i had an overheating prob on my 89. ended up being the head gasget. the gasget failed right near a coolant port and was shoving air into the coolant and formed an air bubble under the therm. and caused the coolant to boil off and overheat.