[Supras] Problem with Overheating

[Christian, Skip]

Dan,

	Start with a new Toyota (stock) radiator cap.  Not sure if the
turbo uses an engine driven fan, but if it does, check the fan clutch.
If only electric fans, check the sensor that activates them.  There
should be no need for a 20lb cap unless your car is highly modified.
	Pin holes in the radiator to reservoir hose will cause gradual
loss of coolant, but will not cause overheating with a full radiator.
Just overheating once the radiator level becomes too low.  Had this
problem on my '88 N/A & it drove me nuts until I figured it out &
replaced the hose.......
	Sorry, but I have to ask, was the head re-torqued after driving
the car ?

Good Luck, Skip

______________
Message: 9
Date: Wed, 23 Jan 2008 21:56:47 +1000
From: "Daniel Hodges" <daniel at hodgesit.com>
Subject: [Supras] Problem with Overheating

Hi Guys, Got a issue with a 89 Supra 7MGTE Targa Manual.

Rebuilt top end of engine and turbo. New Fuel management system
currently it is running really rich in spots but we are working on this
with a new fuel reg etc.

At idle and in traffic it is overheating at times or just looses about
500ml of water a day.

Pressure tested system for coolant leeks etc. Runs at about 15 - a peek
of 17 PSI on Coolant Pressure tests. No leeks found.

We think the 15 psi radiator cap is releasing the pressure a little
early wondering what a factory cap runs at.

Also if anyone has tried a 20psi cap on a supra and if they have had
simular problems with heat issues on a MIII?

 

Kind Regards

Dan