Why does my Supra overheats!

veyspeed007 · 09-28-2005, 04:27 AM

I have a 94 Supra Turbo and my car seems to overheat so quickly. The coolant/water gauge (not sure what you call it) pointer is steady at midpoint up until 30-45 minutes of driving. All of a sudden it creeps up to max (hot) and you can tell that it is accurate because the engine bay is so hot as I open up the hood. There are no coolant leak. There seems to be excess coolant in the reservoir but that's about it. Please help! What else could it be?

suprra_girl · 09-28-2005, 12:15 PM

dare i say it... a 2jz with a blown headgasket?

when exactly does it overheat mainly.... traffic, highway?

does it come back down or stay up hot

does your dashboard gurgle in the mornings when you start it?

whitetiger777 · 09-29-2005, 06:01 AM

I a problem similar on an eclipse. It turned out that the thermostat got stuck. Could be the same thing, but could not be, I've never worked on a 2JZ before.

SupraMan1784 · 09-29-2005, 02:15 PM

make sure your coolant levels are topped off...if they are then check to see if the radiator is leaking, maybe bhg but somehow i kind of doubt it, maybe your water pump is not working...or your oil levels are low...just makin some assumptions right now

veyspeed007 · 10-03-2005, 05:42 AM

all great answers. thank you! i will check it out.

insane_snowman · 10-26-2005, 06:14 AM

are any of your hoses cracked? or have you done a coolent flush recently and didn't get all the air out?

insane_snowman · 10-26-2005, 06:19 AM

whitetiger, you say thermostat, but if that's the issue..it will overheat in around 5 minutes because the hot coolent just stays in the engine, and supraman you say water pump..i could be, im not sure how quickly those will over heat the engine but usually if they fail, coolant steams like a mofo

pwpanas · 10-26-2005, 01:14 PM

Quote:

Originally Posted by insane_snowman

are any of your hoses cracked? or have you done a coolent flush recently and didn't get all the air out?

I agree...it could be as simple as a maintenance issue not flushing the coolant regularly. Several items can corrode and fail in the cooling system without regular flushes, such as the water pump, the temperature sensor for the dash gauge, and the hose coupler over your #6 coilpack. The turbo(s) make the engine bay hot regardless. Unless you actually hear the coolant boiling inside the cooling system, there may not be any problem other than a failing temp sensor for the gauge on the dash.

veyspeed007 · 11-12-2005, 05:56 AM

It turns out that one of the motor of my dual electric fan gave out, so I bought an entirely brand new Flex Lite fan and an aftermarket radiator (Koyo) with new red Toyota coolant and now the car seems to be running great. NO more overheating! Knock on wood!

09-28-2005, 04:27 AM	#1
veyspeed007 Stock Join Date: Sep 2005 Posts: 3	Why does my Supra overheats! I have a 94 Supra Turbo and my car seems to overheat so quickly. The coolant/water gauge (not sure what you call it) pointer is steady at midpoint up until 30-45 minutes of driving. All of a sudden it creeps up to max (hot) and you can tell that it is accurate because the engine bay is so hot as I open up the hood. There are no coolant leak. There seems to be excess coolant in the reservoir but that's about it. Please help! What else could it be?

09-28-2005, 12:15 PM	#2
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	dare i say it... a 2jz with a blown headgasket? when exactly does it overheat mainly.... traffic, highway? does it come back down or stay up hot does your dashboard gurgle in the mornings when you start it? __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

09-29-2005, 02:15 PM	#4
SupraMan1784 SP58GT Join Date: Jun 2005 Location: Dirty Jerz Posts: 691	make sure your coolant levels are topped off...if they are then check to see if the radiator is leaking, maybe bhg but somehow i kind of doubt it, maybe your water pump is not working...or your oil levels are low...just makin some assumptions right now __________________ Now: Saving for an MKIV Broken Rides: (Sold) 91 supra turbo 5speed with a 1jzgte motor 421whp 400(399) ft*lbs of torque on tap @ 15 psi "Always outnumbered, never outgunned."

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09-29-2005, 06:01 AM	#3
whitetiger777 Intake Join Date: Aug 2005 Posts: 35	I a problem similar on an eclipse. It turned out that the thermostat got stuck. Could be the same thing, but could not be, I've never worked on a 2JZ before.

10-03-2005, 05:42 AM	#5
veyspeed007 Stock Join Date: Sep 2005 Posts: 3	all great answers. thank you! i will check it out.

10-26-2005, 06:14 AM	#6
insane_snowman Stock Join Date: Oct 2005 Posts: 6	are any of your hoses cracked? or have you done a coolent flush recently and didn't get all the air out?

10-26-2005, 06:19 AM	#7
insane_snowman Stock Join Date: Oct 2005 Posts: 6	whitetiger, you say thermostat, but if that's the issue..it will overheat in around 5 minutes because the hot coolent just stays in the engine, and supraman you say water pump..i could be, im not sure how quickly those will over heat the engine but usually if they fail, coolant steams like a mofo

11-12-2005, 05:56 AM	#9
veyspeed007 Stock Join Date: Sep 2005 Posts: 3	It turns out that one of the motor of my dual electric fan gave out, so I bought an entirely brand new Flex Lite fan and an aftermarket radiator (Koyo) with new red Toyota coolant and now the car seems to be running great. NO more overheating! Knock on wood!