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The mkiv Supra Owners Club

Does it matter which way the coolant flows through the matrix?


Scott

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As above, I got some -12an hose to supply and return the coolant from the matrix. I got 2 lengths and cut 1 to see what it looked like. By chance the cutoff part that was left fitted in the opposite way from stock (meaning a reverse flow through the matrix) so I was just wondering if I would get away with it as is or if it needs to be as per stock for any particular reason?

 

I don't want to waste a perfectly good bit of -12 for nothing :D

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I would have thought it doesn't matter as long as it has an in and out it will be fine.

 

The only thing I was worrying about would be how the bypass thing worked. I've never seen a matrix up close so not really sure on how it bypasses the hot water for cold air.

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If I can get them round the right way I will, but reading that it might be a coincidence. I'm happy that it won't do any damage though so if I can't get it to fit I'll give it a go and report back if I get the same luke warm symptoms.

 

Nice find Jos, thanks :)

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Just speculation, but it's possible that connecting the hoses the "wrong" way round would inhibit the flow of coolant via convection. I'm not sure where the coolant pathways lead, and specifically the relation between the coolant pump (which will drive the coolant much more strongly than convection flow) and where the pathways that feed the matrix come from. Like in the thread Jos linked to, this *could* cause the matrix to only chuck out warm air rather than hot.

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Just speculation, but it's possible that connecting the hoses the "wrong" way round would inhibit the flow of coolant via convection. I'm not sure where the coolant pathways lead, and specifically the relation between the coolant pump (which will drive the coolant much more strongly than convection flow) and where the pathways that feed the matrix come from. Like in the thread Jos linked to, this *could* cause the matrix to only chuck out warm air rather than hot.

 

I'm exactly the same. I was more worried about breaking something or blocking something though. Knowing that it won't break I'm happy to give it a go to see (if need be of course).

 

I believe the schematic shows a coolant control valve in the matrix circuit.

 

Again, speculation, but maybe this is designed to operate with coolant flowing in a particular direction? I.e. maybe it self-closes if you try to flow through it in reverse?

 

 

Yeah that was what I was wondering. Thinking about it again I had better be careful actually. I've done away with all the other coolant pipes around the engine bay so the only circuit I have left is the waterpump - matrix - head.

 

Think I'll just make sure it's right regardless :)

 

Thanks folks.

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