pdogfly

Resurrection time... I need to adjust the "I" gap, the hood sits slightly higher than the inner fenders just on the sides...it's odd. In the pic attached you can see it slightly. The hood receiving latch is adjusted as far down as I can get it. When it is closed, I can push down on the front of the hood and it will put down and spring back up a little...hmm.

Hmmm...well I won't be able to take another look until Friday or Saturday this coming. I'll post back up when I get a chance to put a meter on the relay poles. I wonder if throttle position needs to be seen by the DME for this to work?

I have the RPM signal output from the GM computer tied into the RPM input to the "DME". I've had the GM computer re-flashed with a 6 cylinder output signal. The RPM on the tachometer is right on and displays correctly. So I know it's getting an accurate signal. I'm not sure if it may need additional information though, seems apparent... Like pin #69 that is labled "A/C Compressor Requirement" I have no idea what that is. I haven't had any diagnostic scanner tool/computer connected to the DME to see what is going on with it. I'm sure it thinks its insane with the stock engine harness missing. :-P

It's a '99 C2 Carrera. The AC system was hooked up to a servicing machine that pulled a vacuum on the system and then put the required 1.95 lbs of R-134a freon in via pumping it in with out the car running. I know it had a full charge from the gauge readings. Once I started the car and pressed the AC *on* button...nothing happened. Then applied 12v to the power wire of the compressor and it did work, clutch engaged and it started pumpin and cold air was blowing while the compressor was working for the time we had it jumped to 12v. I haven't checked any voltages with the relay removed. I do know that there is power being supplied to the relay, can't remember which pin off hand. Just no actuation at the 87 pole which is the wire hooked up to the power supply side of the compressor. I talked to my brother who's a good mechanic and he said that some forign cars provide Ground (-) to some accessores to complete the circuit. Any idea if this is the case with Porsche AC Compressor signaling? When I'm able to look at it agian I'll see what the voltages are with the relay removed at the numbered pins... I talked to a Porsche service provider and they said that scanning the computer would not tell him if the AC pressure switch was good or bad?? Is there a procedure to bypass the pressure switch? I tried to use the paper clip method to close the circuit that I saw on the diagram that should be closed in order for it to work...ended up blowing the blower fan fuse! Ugh... What is DME? ...in aviation it's Distance Measuring Equipment :-P I'm not sure what a Durametric is?? I know the compressor works, just need to figure out what's going on with the signal that controls it. I know there is a low and high RPM window that it will operate too, and I want to keep that functionality so it works like it was on the factory engine. Hope to have this sorted out soon! It's not getting any cooler in S. FL!! Thanks, Patrick

I believe I have everything hooked up and wired correctly but I'm not getting voltage from the relay when the AC *Snowflake* button is pushed on the climate control unit. I've checked the wiring diagram. One of the 2 wires connected to the 87 pole on the AC relay (on Support 2) goes to the engine harness cannon plug (Pin #23). I took that wire all the way to the compressor (+) lead. On the wire diagram, Pin #25 is also drawn near by #23 where the compressor lead is...anyone know what that is for? (See attached...) Got the system charged today, and with a full charge ... the compressor would not engage. Verified there was no voltage at the compressor. To see if the compressor would engage, I jumped it with 12v(+) and got the compressor to engage and indeed it is blowing cool air!! So I'm wondering why this isn't being done automatically by the climate control unit? Also pin #69 on the ECU harness says "A/C Compressor Requirement"...any idea what this means? Does it need to be hooked up to something? I thought maybe there was no RPM being detected by the Porsche ECU which may have been the issue, but I double checked and the output from the GM computer is sending the correct signal to the RPM input on the Porsche ECU. Attempted to swap some relays around on the #2 support next door to the ECU...no joy. No voltage being sent out of the 87 pole on the relay. There is voltage being supplied to the relay though... Any help would be appreciated...I hope it's just maybe a simple bad relay or pressure switch. But if it isn't, what could it be? I haven't verified that the AC pressure switch is working correctly. And I haven't traced and seen which other wires associated with the AC relay go to or do. I'm a GM guy and familiar with their scanning capabilities, if I take the car to a Porsche dealer, any idea what they would charge to do a diagnostic to see if the pressure switch is working properly or to maybe see if the AC button on the control unit just may simply not be working? The 'Snowflake' appears on the unit when the button is pressed...just no relay action to send 12v to the compressor. Thanks, Patrick