Since both the compressor & the condensor fan work fine, start tracing back. Both are fed through relays but it's unlikely both have failed at the same time & if I read all the posts correctly you tested the fan relay already. Both of those relays are fed directly from the fuse box in the front so your problem is likely somewhere in the circuit between the fuse box & the relays. I would take Tim Hancock's advice and start troubleshooting the fuse box itself and the wire connections.

Dietmar, you have the ever popular tarnished wire problem. You will have to systematically have to check each wire going into your fuse block for built up resistance(tarnished material) and loose wires. Somewhere in that rats nest of wire Porsche calls a fuse block you have a loose or poor connection. Over time, I have redone my crimped connections to the ac switch (they got hot as Hxll before redoing), same thing with the smugglers box relay. All those little points add resistance and cause relays to trip out. A crimp kit is cheap and easy and cheap insurance. Look in your evaporator area and there is a relay on the side wall that has a fuse/relay set up. Buy a replacement for it from Pelican. Redo the crimps for the connectors and put some rubber shrink fit on them and I bet you will be good to go.

latest update....swapped one or the red relays, wiggle and jiggle and so far it seems to work....I am a little perplexed by the whole thing.
Poor electrical connection is definitely the source... I guess it would be a good precaution to replace all of these old relays? Or do you guys think that is overkill? I wonder if the wiring itself goes bad or if it is primarily connectors?
It looks like it will be in the 90s today I am sure glad it blows cold air right now!!!
These were long posts, maybe somebody else can learn from my mistakes here! I appreciate all the help and input. I 'll put it to rest for today and probably order some new relays if people agree with that...

I still think you should look at the fuse block connections. Not the wires themselves so much, but the connections between the fuse receptacle and the fuse box. Hell, the fuse holder itself can even be tarnished up to the point that it will not work under load.

Tim,

I know I need to check all of these, got some corrosion under the battery too, need to check all these things, but I'll just give it a rest for right now, I know my parts are good, it is connectors that are weak and I can work on those....still probably going to replace the relay with new one(s)

Supposedly the climate control switch on my car is bad (this form the PO's mechanic). No signal from the temp switch would mean no cold air, no? So, how would kennel test that?

I just jumpered around it. It is just a temperature switch for the cabin air. If you can get to the back of the switch pull the two wires off, remembering where the came from, using a set of alligator clips with a wire connected to them (or two spade connectors crimped together) and connect them together. Should work.

Dkennel,

How much was the installation? I'm in Dallas too and I NEED A/C!!!