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Tidybuoy's Avatar
 
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Heater Valve - Where is it located & A/C Question

I just had the A/C serviced. The car has been in storage for 6 years and so the freon had all leaked out.

The mechanic charged the system but told me that the climate control is cycling back and forth from A/C to heat and back. He said it will require further diagnosis to find the culprit but since I needed my car back, I didn't have it fixed.

He told me that it could be the internal temperature sensor, external temp sensor, heater valve or other.

I thought I would replace the heater valve and maybe the internal temp sensor to start (that's probably cheaper than having the shop diagnose anything). And, if that does not fix it, I will return to the shop.

So, where is the heater valve located.

Also, what is the device that is located on the driver side fender next to a diagnosis port that is some type of valve and it connects up to the vacuum line going to the charcoal cannister?

Any advice would be great............................Vern

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Vern
'06 Cayman S - Arctic Silver, "R" Springs & Struts, Spyder 19" Wheels, 82mm Plenum & Throttle Body.
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Old 03-06-2007, 11:04 AM
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The heater valve is located at the back of the engine, between the head and the firewall. It is a real pain to get to.

It is just a plastic water valve that opens up to let hot water into the heater core. What usually happens is the cable connecting the interior control to the valve breaks, leaving the valve in its last position. Typically, it breaks with the valve open, and you get heat all the time.

Not sure which device you are referring to on the fender well, but the charcol canister is to trap fuel vapor from the fuel tank vent.

good luck,
JM



Old 03-06-2007, 12:48 PM
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Thanks.

I may post a pic of the divice I'm looking at on the fender. I thought that was the heater valve but it would make no sense to to be hooked into the vacuum canister.

My heater valve does not stick on. but the heater turns on and off at random (including the fan turning on). Maybe it's not the valve at all but the interior temperature sensor...I guess I'll find out someday.
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Vern
'06 Cayman S - Arctic Silver, "R" Springs & Struts, Spyder 19" Wheels, 82mm Plenum & Throttle Body.
'74 911 Coupe - Silber Metalic, PMO ITB, Electromotive Mgt
'16 BMW R Nine T (the fun one) & '17 BMW G310R
Old 03-06-2007, 01:43 PM
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Isn't the heater valve relocated towards the front of the engine on the 88?
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Old 03-07-2007, 06:21 PM
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And it uses vacuum rather than a cable. Check above your gas pedal and see if there isn't a broken of loose link on the heater box. Could also be the climate control unit. The one in the dash.
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Hugh - So Cal 83 944 Driver Person
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Old 03-07-2007, 06:56 PM
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The part on the fender you are referring to is a valve for emissions control and I don't remember anyone having to mess with that.

Here is a link to a web site that shows you how to check the linkages that SoCal mentioned. It's very common for the plastic clips to break on these cars. I've replaced them on both my 944s.

http://www.kronowit.com/porsches/944-heater-fix.html
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Old 03-07-2007, 07:48 PM
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razorback that is a very good link + i found the complete parts catalog on his site , for free i download it and thats a score if you guys dont have a copy
i d get one
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1986 944 n/a hard top, black on burgundy
Old 03-07-2007, 10:49 PM
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You can get basically the same PDF on the Porsche web site. Might want to check there and get all of the 944 and 924 variations parts catalogs.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 03-08-2007, 08:40 AM
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Thankyou Rasorback!

That link explains it all - guess what I'm doing this weekend?

Vern

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'06 Cayman S - Arctic Silver, "R" Springs & Struts, Spyder 19" Wheels, 82mm Plenum & Throttle Body.
'74 911 Coupe - Silber Metalic, PMO ITB, Electromotive Mgt
'16 BMW R Nine T (the fun one) & '17 BMW G310R
Old 03-08-2007, 09:06 AM
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