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The mkiv Supra Owners Club

Coolant advice


MarcusEJ
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You possibly have a fault if your coolant is low, the rad cap is the first thing to replace unless you know

its been done. use an O/E cap from Toyota.

 

Heater matrix feed hoses are common to fail on these but can be easily replaced with either o/e

hoses (expensive) or good quality silicon hoses for which there are lots of suppliers if you google

it.

http://www.merlinmotorsport.co.uk sell it and sell Samco which is one of the best

 

A pre mixed Ethylene Glycol antifreeze is whats recommended, the system holds just under 10 litres

if your thinking of changing it which again is what i'd do if you dont know how old it is or what it is

 

Toyota sell CoolRed pre mix and discounted its approx £20 for 5 litres, do not use the Pink stuff they sell !!

 

If you use a non pre mix don't mix it with tap water, just look at what it can do inside your kettle, you'll need distilled water if you go this route.

Edited by Dnk (see edit history)
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Is you rad the original ? some aftermarket rads use different caps so it

would pay to check this before you buy a new cap.

 

You can also have a simple pressure test done on the cooling system which

should show if there are any leaks and shouldn't cost more than an hours

labour, any proficient garage should be able to do that.

 

Here is the cooling system pdf, page C0-18 shows the pressure test

 

If you do decide to change the coolant it might be a good idea to also

replace the thermostat unless you know its been done, again i'd use

an o/e one from Toyota, (82 degrees C opening temp) i think the

seal comes separate with these which you'll also need to replace

CO.pdf

Edited by Dnk (see edit history)
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