Random Overheating?

Bill UK · 01-12-2007, 06:05 PM

Could be the temp sender unit.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=113

Bill UK · 01-12-2007, 06:15 PM

This should help

Supra2NR · 01-12-2007, 07:18 PM

I remember sumbody sayin that
If your temp gauge is acting like its possed it could be air in your coolant sytem
Try bleeding the coolant and see if this fixes the problem

IHateHacks · 01-12-2007, 08:27 PM

I would try changing the thermostat.

Or you could install an aftermarket water temp gauge, (to see if its a gauge problem which I doubt) by removing the stock gauge sensor (in that pic), and installing the aftermarket sensor in its place.

Have you tried block testing it yet? That's the ONLY way to tell if you have a blown head gasket or cracked head, block, cylinder. It checks for exhaust gas in the cooling system, no other test does this.

I hate to say this but my car did the same EXACT thing, random overheating, shut it off for 1 minute and start it and the temp comes plunging down to normal. It would overheat as soon as it warmed up from a cold start one day but the next day I would beat the crap outta it on the highway and it would not overheat, but then it would when I was just crusing the next day. Compression on my motor was 180 in all cyl's. Pressure tested my cooling system it checked out fine (held 15psi for 10 minutes). Never burned or used any coolant. You can check my post in MKIII section to see what my problem was.

01-12-2007, 07:18 PM	#3
Supra2NR 1000whp postwhore Join Date: Apr 2006 Location: Chi-Town Posts: 1,643	I remember sumbody sayin that If your temp gauge is acting like its possed it could be air in your coolant sytem Try bleeding the coolant and see if this fixes the problem __________________ http://www.myspace.com/supra_2nr Into Bikes now,, apparently the supra couldnt kill me, so my zx6 might lol

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01-12-2007, 06:05 PM	#1
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	Could be the temp sender unit. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=FI&Page=113

01-12-2007, 06:15 PM	#2
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	This should help

01-12-2007, 08:27 PM	#4
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	I would try changing the thermostat. Or you could install an aftermarket water temp gauge, (to see if its a gauge problem which I doubt) by removing the stock gauge sensor (in that pic), and installing the aftermarket sensor in its place. Have you tried block testing it yet? That's the ONLY way to tell if you have a blown head gasket or cracked head, block, cylinder. It checks for exhaust gas in the cooling system, no other test does this. I hate to say this but my car did the same EXACT thing, random overheating, shut it off for 1 minute and start it and the temp comes plunging down to normal. It would overheat as soon as it warmed up from a cold start one day but the next day I would beat the crap outta it on the highway and it would not overheat, but then it would when I was just crusing the next day. Compression on my motor was 180 in all cyl's. Pressure tested my cooling system it checked out fine (held 15psi for 10 minutes). Never burned or used any coolant. You can check my post in MKIII section to see what my problem was.