Overheating

fasteddy5000 · 03-10-2010, 05:02 PM

I have a 1990 mk3 supra. Ive changed the hoses, thermostat,waterpump, and radiator cap. What happens is that once at running temperature the over flow tank gets full from the radiator but the radiator never pulls it back. So the tank just overflows spraying coolant everywhere and then the engine gets hot from lack of coolant. I think the head gasket might be the problem. HELP please if anyone has experienced this. Thnks, Ed.

TripleC · 03-10-2010, 05:42 PM

Quote:

Originally Posted by fasteddy5000

I have a 1990 mk3 supra. Ive changed the hoses, thermostat,waterpump, and radiator cap. What happens is that once at running temperature the over flow tank gets full from the radiator but the radiator never pulls it back. So the tank just overflows spraying coolant everywhere and then the engine gets hot from lack of coolant. I think the head gasket might be the problem. HELP please if anyone has experienced this. Thnks, Ed.

vAPOR lOCK - sounds like your thermostat might be sticking. you could have a shop do a pressure check. DOes the coolant have any Brown'ness to it. OR look like poop soup this is a signal for a Blown Head Gasket (ps. you coolant would keep running throught the system picking up more oil and making it got hotter faster.
Did you check the Radiator cap and get the exact same psi rating ( i F-'d that up once before) it makes a substantial differance.
oil in coolent = BHG
Collant overflow = Stuck T-stat, bad rad cap.
It sounds more and more like a bad thermostat stopping the flow of coolant at the bottom of the system. .
Let us know what happens

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...

03-10-2010, 05:02 PM	#1
fasteddy5000 Stock Join Date: Mar 2010 Location: central coast Posts: 10	Overheating I have a 1990 mk3 supra. Ive changed the hoses, thermostat,waterpump, and radiator cap. What happens is that once at running temperature the over flow tank gets full from the radiator but the radiator never pulls it back. So the tank just overflows spraying coolant everywhere and then the engine gets hot from lack of coolant. I think the head gasket might be the problem. HELP please if anyone has experienced this. Thnks, Ed.

03-11-2010, 01:32 AM	#3
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	#5
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	#4
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.