Chris

So maybe my memory is hazy but I am certain my 91 would cycle the air con compressor in order to keep the interior at a constant temp on a hot day.

My 87 keeps the compressor on and injects heat to keep the temperature settings, this seems somewhat archaic.

Were the later control units more advanced in this respect?

Chris

atb

Ah ha!

Now you are starting to realize the grave mistake you made in letting your '91 go aren't you?

Sure your red rocket looks great and runs like a banshee, but I've got three words that put it all in perspective: '91 - Black - A/T

Repent, come back from the dark side, its not too late. You won't be the first person in the world to admit the error of their ways.

heinrich

Chris all I've ever known are pre-88's. All of them do as your 87 does.

Chris

Funny one Adam, on the way down to Sharktoberfest I was for sure wondering whether I had done the right thing ....

Chris

Tom. M

haha....but I seem to remember last weekend...whilst under Seans 83 Euro..doing a clutch....Adam casually mentioned that his next 928 will likely be a 5sp.... even while wrestling with a double disk clutch and headers (those of you with headers know the pain.....of a clutch swap)...

later,
Tom
89GT

WallyP

To the best of my knowledge, all of the automatic 928 HVAC systems work the same way...

The temperature is controlled by the "setting motor" - a servomotor that uses the outside temp sensor, the inside temp sensor, and the temp control lever for input. The setting motor moves internal flaps to blend air flow thru the evaporator and the heater core. I have never seen the temp control system operate the A/C clutch. The system does give full A/C with recirculation at full cold settings.

It is normal for the A/C clutch to engage and disengage as the evaporator anti-freeze switch controls the temperature of the evaporator at or near freezing.

atb

Yes Tom, that was my statement, but between my lungs bleeding and my forearms feeling like they were being swarmed by bees due to all the headerwrap material raining down on me, I was surely delirious.

jadavis01

So Adam, Tom, do you guys want to help install my level 2 headers and rrr soon? I do need to find an x-pipe to mate to the headers though before doing the swap.

IcemanG17

Chris
It does sound like the anti-freeze switch....my 88 does the same thing...& since my recirc flap is broken and stuck on fresh air....when your driving in the 105 heat and the A/C cuts off....that fresh air gets damm hot real quick! I imagine with a properly working recirc flap it would be less apparent.

Tom. M

Hey John, Absolutelypositively yes......just let us know...

Later,
Tom
89GT