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Expansion Valve Q.s

MikeC5 on Wed November 11, 2009 10:53 PM User is offlineView users profile

Year: 84
Make: Porsche
Model: 944
Engine Size: 2.5 L
Refrigerant Type: R-12

I'm shopping for a new expansion valve for the above vehicle and am finding quite a price spread. I haven't removed the old valve yet and I'm hoping it will have a part number to cross reference. In photos of the valve from various sites some show it with just a coil and others (like AC Kits) show it with a coil and a second tube with compression fitting. I'll soon find out which one I have but is the 31-10931 a commonly used valve (and is it OK with R-12 and 134)? The AC evap unit in these cars (before mid-85 configuration change) is a bolt in Nippondenso unit which is not integrated with the heating system. I also can't seem to find the factory specs for the valve as far as overheat, etc. Is there a site where such info can be looked up?

Thanks,

Mike

MikeC5 on Thu November 12, 2009 8:24 PM User is offlineView users profile

The original expansion valve part number is 047500-0320. Also printed on the diaphragm housing is ND 8D03. I assume the ND is for Nippondenso but I can't find any cross reference to this number. The valve only has the capillary (coil tube), not the other one with the nut on the end like AC Kits 31-10931. Can this other tube be snipped off without causing problems?

Also, the coil part was wrapped to the evap outlet tube with a sheet of cork and glued with a tar-like substance. I assume it is important to keep the coil tight up against the evap tube and insulated. Is there a modern-day substitute for the cork?

TRB on Thu November 12, 2009 8:40 PM User is offlineView users profile

Post an image of the valve you have.

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MikeC5 on Thu November 12, 2009 9:36 PM User is offlineView users profile



I uploaded a picture to the above link.

MikeC5 on Thu November 12, 2009 10:05 PM User is offlineView users profile

Sorry about the over-sized photo.. I think I found the answer to my question about 1 tube vs. two. For the valves that have 2 tubes coming off them, one is an external equalization tube. A valve like mine is internally equalized (to the pressure in the evap). I would assume you can't simply lop off the extra tube to convert the external to internal. So I guess the question is for the 31-10931 which is specified for the '84 944 a one or two tube design?

TRB on Thu November 12, 2009 10:18 PM User is offlineView users profile

You need 31-10912, image on our site is poor. I'll have it updated in the morning.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

MikeC5 on Fri November 13, 2009 8:07 AM User is offlineView users profile

The 31-10912 valve works for either R-12 or R-134?

TRB on Fri November 13, 2009 9:49 AM User is offlineView users profile

Most valves produced today work that way. Even older valves will work with both as your reading the superheat to control valve function.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

MikeC5 on Fri November 13, 2009 12:58 PM User is offlineView users profile

O.K. Thanks TRB. I'll be ordering one today.

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