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 Post subject: 944 thermostat
PostPosted: Sun Feb 25, 2018 2:29 pm 
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Joined: Tue Nov 08, 2016 5:47 am
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I assume the thermostat has gone, even when turned on to cold my heating is pumping out very hot air, so much so that I had to travel with the sunroof / window both slightly open yesterday just to stop sweating !!
How much should I be looking at for a new thermostat fitted ?
Cheers. Ian


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 Post subject: Re: 944 thermostat
PostPosted: Sun Feb 25, 2018 4:20 pm 
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Have a read of this http://www.clarks-garage.com/shop-manual/hvac-01.htm

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 Post subject: Re: 944 thermostat
PostPosted: Sun Feb 25, 2018 6:13 pm 
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Is your engine overheating, or failing to reach normal operating temp?

Engine cooling and cabin heating are very different systems, so I doubt t-stat is involved.

I admit to knowing nothing about 944 HVAC, but solution will lie in reading up on that system and testing relevant components. My knowledge limited to 928s where always hot cabin temp would be caused by:

Failed cabin or external temp sensor
Failed blending flap motor
Failed slider pot/connection to hvac head

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 Post subject: Re: 944 thermostat
PostPosted: Sun Feb 25, 2018 6:34 pm 
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Broken clip on the control rod

944 572 313 00
944 572 314 00
944 572 217 00

Part numbers for the clips, all about £2 each

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 Post subject: Re: 944 thermostat
PostPosted: Sun Feb 25, 2018 10:31 pm 
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Thanks guys.
The engine temperature seems fine and the cars running sweet, someone suggested a broken clip / rod on the controller, this sounds possible, I was going to take it in to GT-one porsche in chertsey pretty soon anyway as the short-cut button for the window heating has stuck.
Also whilst I’m here, it had frost on the inside of the window yesterday, I assume it’s common with a 29 year old car kept out over night ?


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 Post subject: Re: 944 thermostat
PostPosted: Mon Feb 26, 2018 1:03 am 
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Joined: Fri Jun 12, 2015 5:02 pm
Posts: 574
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Waylander wrote:
Broken clip on the control rod

944 572 313 00
944 572 314 00
944 572 217 00

Part numbers for the clips, all about £2 each

I second that. worst case the valve the rod goes to is stuck open.

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 Post subject: Re: 944 thermostat
PostPosted: Tue Feb 27, 2018 10:09 am 
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The control rod clip does break. An often overlooked part is the vacuum operated actuator on the heater rail (coolant line) in the engine bay. If that actuator is broken, inoperative or is not having vacuum applied to it you'll always have hot air entering the cabin.

IME a vacuum line can knock off it. To test put the car to to position no.2 Put the car to red hot on the climate panel and the rod should be fully extended. Then put it to fully cold. The actuator rod should go into the diaphragm and stop the flow of water into the cabin.

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