82Porsche928

I'm pretty sure it's from china, and I would have bought it about a year and a half ago...

HaydenM1974

The one at Harbor Freight is a Mityvac for 39.99

HaydenM1974

You are going to lose 10 pounds on the way home tomorrow with your AC not working....Hopefully I will too but I think that might be a good thing....celebrating number 40 next week and the metabolism is slowing down....

82Porsche928

Hahaha good thing I love 5 minutes away! I don't mind some heat!

HaydenM1974

I thought you were up north since you are opening your business up there....you need to roll over some time and we can work on these bitches....the cars, not the ladies....they are a worse headache than our cars....my wife works nights so anytime you want to roll over here and get these gremlins figured out let me know....

82Porsche928

Let's talk tomorrow, I'm always down! I have a big garage too, so we don't need to work outside.

syoo8

When you change the heater valve, change the short hose that connects to the heater valve. Apparently it is a failure item. Might as well, while you are in there.

After changing the heater valve, you still may get a bunch of hot air-- you probably have a huge vacuum leak. Need to change the HVAC actuators as well.

MainePorsche

And... make sure you have a good vacuum source to the system. Check the source line to its connection off the master cylinder. There are several points along this path where you can have vacuum loss and compromise the system. A new heater valve without adequate vacuum will resemble an old heater valve. Best Wishes.

SeanR

Here's Wally's fantastic write up on the HVAC system.

http://www.928gt.com/t-wallyhvac.aspx

Alan

I doubt that will be the case here - I think you most likely have a vacuum issue - however a new heater valve won't do any harm, and its possible its one of several causes. Given your other symptoms - I'd not start there though.

Alan

82Porsche928

I'm going to follow Dwayne's write up, and replace diaphragms, the valve, and any hoses losing vacuum. Hayden and I may have found the mystery wire, and will look into that soon as well.