Pressure Relief Thermostat (PRT) - How to Replace

9 years 1 week ago - 9 years 1 week ago #31445 by David Aiketgate
Later TFs had a different configuration of thermostat fitted as part of the search for the cure to HGF.

The PRT system moves the thermostat from the original position under the inlet manifold to the outlet side of the engine.

You will find it here.



You'll need these.





To access it, you will need to raise the rear of the car. I used the central jacking point to lift it and positioned axle stands under the subframe. I also chocked the front wheels. Ensuring that the car was safe and secure.



I released the rubber hose from the underfloor pipes positioning a suitable container to catch the coolant. And then opened the three bleed points - Radiator;Heater matrix; and return pipe in the engine bay.




Once all the coolant has drained you will be able to undo these three clips to free the PRT module. Be aware that there will be coolant held behind the thermostat. (Does coolant help hair growth?)probably not... ;)



David
:shrug:
The following user(s) said Thank You: Leigh Ping

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9 years 1 week ago #31446 by David Aiketgate
With the PRT removed I tested it in boiling water. It remained closed - rock solid.

Replacing with the new PRT module is obvious enough and then you need to refill with coolant,(You will need 10.5 litres if you've previously extracted all the coolant) - bleeding air out at the three bleed points(heater on full hot). Run the engine with the expansion cap off, topping up as necessary. Replace the cap, and keep checking for leaks.

If you're happy there are no leaks, test drive the car. Check the heater is working and the coolant level is OK on return.

David
:shrug:
The following user(s) said Thank You: Leigh Ping

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9 years 1 week ago #31447 by PQD44
Thank you for taking the time to log your problem the solution and this handy guide :thumbsup:

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9 years 1 week ago #31448 by David Aiketgate
I can report that the heater is working properly again. :yesnod:

Also worth noting that the PRT conversion certainly makes changing the thermostat easier than the original position.

David
:shrug:

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9 years 1 week ago #31457 by bryan young

David Aiketgate wrote: I can report that the heater is working properly again. :yesnod:

Also worth noting that the PRT conversion certainly makes changing the thermostat easier than the original position.


Thank you for posting this and the "how to" :thumbsup: Is there a "how to" for fitting the PRT conversion and is it possible to fit a PRT with the stainless steel engine pipes that are being sold by B&G?? :shrug:

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9 years 1 week ago - 7 years 11 months ago #31458 by David Aiketgate

bryan young wrote:

David Aiketgate wrote: I can report that the heater is working properly again. :yesnod:

Also worth noting that the PRT conversion certainly makes changing the thermostat easier than the original position.


Thank you for posting this and the "how to" :thumbsup: Is there a "how to" for fitting the PRT conversion and is it possible to fit a PRT with the stainless steel engine pipes that are being sold by B&G?? :shrug:


There isn't a How to as such.

I've got two photos showing the pipework configuration before and after.



This is how the pipework connects to the underfloor pipes.



This is how the PRT fits in, with the original again to compare.



The hoses connect to the engine and metal engine pipes in the same manner otherwise. Notice how the prt reverses the flow through the radiator. Obviously you need to replace the original thermostat with a blank.

David
:shrug:
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