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The mkiv Supra Owners Club

No heaters... help please


Guest zander24

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Guest zander24

Know that this is a a common thread, but interested in your views in my situation..First of all there is no heat if driving on a cold day, very small amount of heat if day if not cold...My car is a 95 jap TT6

My first steps were

I removed the 2 pipes that go to and from the heater rad, water very rusty colour... hooked up garden hose and ran water through the heater rad so its not blocked,

i also tried this with temp dial at hot and then turned to cold... water passed through when heater set to hot and stopd when turned to cold.. so that valve is working...

one thing i noticed when i took off heater pipes was that there was little or no flow until you revd car up...and i think heaters get better if you sit in on spot and hold her at 4 or 5k revs..and heaters seem to die again when revs die down..

Top tank of rad was very hot, core of rad was cold.. bottom pipe cold and top pipe roasting but when i pulled top pipe off had nothing in it...

all the above were pushing me and anyone i asked to conclude water pump with fins broke off.. so i purchased and went to the hard job of fitting it today... bad news is the old pump looks fine and thermostat is opening and closing in boiling water aswell... fitted the new pump anyway but havent her running yet as the Anydarkness caught up on me tis eve...Temp gauge always stays around half way and ive never heard gurgling from behind dash??

i am puzzled now, was sure the pump wasnt pushing the water around

ANY HELP APPRECIATED

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I still have the same problem on mine, but with it not being road legal can't test the one thing that everyone has recommended - take it for a drive :)

 

Did you manage to get the car out and on the road to see if the system flushed itself? Most people report that it just needs to get up to road temp to sort itself out.

 

Can you hear the heater matrix actuator working when you move the heater dial from cold to hot?

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I had exactly the same problem with my Peugeot 306, came out as headgasket failure. All symptoms was spot on with yours (half cold/half hot radiator, top pipe roasting and empty/bottom cold, heater matrix cold unless hold on revs).

But before you will start worrying, take her for a ride - be aware that one of the pipes can go pop if it is headgasket, so keep your eye on the road behind you and temp gauge!

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