Heckscheibenheizung defekt (924 S)

Hallo,

am in Fahrtrichtung linken Kolben ist ein
Schleifer mit der Spannung.

Gruß Jürgen

leitet nur geschlossen, da ist ein kupferner kontakt an der gasfeder

Hello Rettich!

I hope you have solved your problem by now, but just in case...

I also had (or one could say "Still have") a problem with Heckdeckel heizung. It's a pain in the ass, esp. in winter. The basic principle is that electrical current makes heater lines warm, so the fog and moisture should go away instantly, which hardly happenes in 924! It takes sooooo much time to dry the glass, and that glass (Heckdeckel) is a big one, isn't it?!

So, current comes from relay and fuse (make sure their contacts are dry and clean, 'cause heater needs strong current!). Sometimes one could measure voltage, but heater works badly or doesn't work at all. It's because of weak current (low Amps), and fuse is something about 8 or 16 A. Just to be sure of what's going on, disconnect power leads from gasfedern and use a strong power cable (one you usually use to connect your powerful speakers to audio amplifier). If you open Heckdeckel and stand on backside of your Porsche, on your left side should be positive voltage cable (left gasfeder), and on the right side is the other one. Now you can measure Voltage and Current with open Heckdeckel. Use one 21W 12V light bulb to test power of supply. If the bulb fully lights on (whatch your fingers from heat!!!), then something else is wrong check heater leads on the glass with your Ohmmeter, should show some low resistance if not broken. Last thing that could be wrong is dashboard switch and cables that should reach relay. Also, check if the Gasfedern are conducting current in closed position.

In my case, relay and fuse have had bad contact, so I cleaned them and I have Heckdeckel heizung, but still I'm not satisfied! Must be constructor's fault...
I hear 944 has a better H-d heizung, so I guess we sould buy one

That's all!

Friendly Greetings from Serbia

__Joste 924'84_______________