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 Post subject: 944 Heater woes
PostPosted: Thu Oct 18, 2018 12:31 pm 
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Hi all, I have a small problem with my heater. On my 89 944 non A/C, in the cold position it blows warm air, in the hot position it blows hot air, this tells me that the heater connecting rod is still attached but I can’t seem to get cold air into the car, could someone kindly point me in the right direction please ? Cheers Tony

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1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 2:50 pm 
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Hi Tony

This would normally indicate that the little rod accessible with the glovebox removed has snapped. However it could literally be anything in the HVAC system. I would check the linkage rod first, its only a couple of pounds from Porsche.

Stuart

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'90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK

Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump.


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 3:01 pm 
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Thanks for the reply Stuart, surely if the rod had come adrift I wouldn’t get any fluctuations in temperature though ??

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1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 4:52 pm 
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Ah right you are getting warm air on cold and hot air on hot. That's more likely a vacuum issue in the system then. My S2 cab done that, the rod was also broken, but fixing it made no difference. I would check all your vac lines and hoses and vac devices next. You probably have worn thermistors also, as everybody does! 3 of those in your system. Usually you can tell if your hot air backs off, whilst the dial is still full hot. And if you press demist it goes full hot again.

Incidentally I never got that issue sorted before I sold the cab.

Stuart

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'90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK

Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump.


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 5:40 pm 
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Joined: Mon Nov 23, 2015 7:31 pm
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Location: Cheshire
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I had similar symptoms. The plastic clip which everyone mentions was present and was connected to the control rod (accessible through the glovebox) but it was sufficiently broken to only partially grip the rod. It would move towards the cold position but would slip so I generally had warmish air in all control positions.

Hope that helps

BR

Matt

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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 6:35 pm 
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Cheers guys will look at all these, where do I find these theristers that may need changing ?

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1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 8:44 pm 
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RS components stock them. Probably need to buy 10 but they are buttons. I don't have the part number to hand. Some kind soul will put it up.

Stuart

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'90 944 Turbo - Sunroof delete, Factory bridge spoiler, CS wheels, CS steering wheel, 1st MY90 turbo in UK

Promax L2 chips, SciVision MAF, Lindsey DPW, MBC, Forge recirc valve, 3 bar FPR, K&N panel, GAZ Gold, wideband AFR, Sytec Motorsport Fuel Pump.


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 Post subject: Re: 944 Heatef woes
PostPosted: Thu Oct 18, 2018 9:55 pm 
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In the car the thermisters are one on the little fan housing at the end of that rubber tube next to the cig lighter, one in the center vent need to pull the instrument binacle to get at it and the easy one if under the bonnet next to the air intake ( not servicable). You can test them at the ccu plug with a multimeter. I had a dud one behind the center vent, a tricky soldering job.
Following that the heater started doing funny things on iis own, warm then cold for no reason. Would you believe it a bad earth strap.
There is some info on Clark,s and test figures in the manual and on Rennlist. Waylander is your man for best info. The water valve can sometimes fail and vac connections as said need checking.

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Porsche 944 S2 Coupe Guards Red
Porsche 993 Coupe Guards Red
Ducati 998 FE Red oc


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 Post subject: Re: 944 Heatef woes
PostPosted: Fri Oct 19, 2018 12:01 am 
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cheers guys, sounds right complicated to me & im used to working on cars !! :o

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1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


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 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 19, 2018 2:14 pm 
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I will sort the part number out when I’m back from Italy

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Cobalt Blue 968 Coupe 1992


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 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 19, 2018 3:04 pm 
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Joined: Wed Jun 08, 2011 2:41 am
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That’s very kind of you thank you

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1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


Top
 Profile  
Reply with quote  
 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 19, 2018 8:27 pm 
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Posts: 1665
Location: West Essex
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In fact I’m sure they are on here already somewhere
Just have a search

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Cobalt Blue 968 Coupe 1992


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 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 26, 2018 3:29 pm 
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Joined: Tue Nov 19, 2013 11:48 am
Posts: 1665
Location: West Essex
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From RS components

697-4465
Or
ND03N00103J

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Cobalt Blue 968 Coupe 1992


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 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 26, 2018 3:32 pm 
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Joined: Wed Jun 08, 2011 2:41 am
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Location: Herts
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Thanks so much everyone I just need to find out where on the car it is & how many I need to replace ? I’m not great with electrical testers etc

_________________
1989 2.7 944 LUX in guards red. 121k miles
1988 1.6 Toyota MR2 MK1 in Mica blue. 79K miles
1995 1.3 Toyota Corolla in white. 47K miles
2005, V12, 3,300 BHP, 127 Ton class 66 locomotive as everyday transport in maroon & yellow 700k miles plus appox !


Top
 Profile  
Reply with quote  
 Post subject: Re: 944 Heater woes
PostPosted: Fri Oct 26, 2018 4:27 pm 
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Joined: Tue Nov 19, 2013 11:48 am
Posts: 1665
Location: West Essex
TIPEC membership: 0
There are 3

Under the bonnet by the wiper end air intake for the heater
In the central mixing chamber for the cabin vents
In the end of the cabin air sampler, that’s the fan at the end of the tube connected to the vent by the ciggy lighter

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Cobalt Blue 968 Coupe 1992


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