Cooling issue with Toyota MR2

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Cooling issue with Toyota MR2

I've recently bought a Toyota MR2, but am having problems with air appearing in the coolant.

I've changed for new the following:

Radiator
Major cooling hoses
Water pump
Thermostat
Rad cap

I've also checked all small hoses, compression and the cylinders. I've also carried out a coolant pressure test found a few small leaks and fixed them. The headgasket tester for exhaust gasses has also passed fine. Any ideas?

Asked on 12 November 2014 by jaydee chris

Answered by Honest John

An MR2 turbo is not a UK market car, but of course you know that. How is the turbo cooled? I'd guess that, as well as standard oil cooling from the engine oil flowing through the turbo bearing, it will be water-cooled, and the temperature around coolant as it passes through the turbo will be higher than anywhere else in the engine. I'd guess that is the point where evaporation is occurring, causing the oxygen in the coolant.

Tags: technical issues turbo engines

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