Carpokes Porsche Forum

I just linked your video on Rennlist where I had also posted a thread in the 944 turbo forum.

I had a similar issue and here is how I tackled it.
My test procedure was first to ensure the motor was getting power by grounding out the sensor (in my case the motor would run).
I had limited testing equipment so I opened my relay to visually inspect capacitors and took readings of the resistors. Everything looked fine, but since I had trouble sourcing a replacement relay, I just replaced the timer IC in the relay and the issue was solved. The IC was 1-2$ if I recall correctly.

Where did you purchase the timer IC from and how difficult was it to replace it?

Just to update, I replaced my relay with one bought on ebay. Now the aux pump works again. Thank you everyone for your help.

Just a note - if the relay for the waterpump aux motor is dead, before buying a replacement, you can try replacing the Timer IC on the relay circuit board for ~1$ (555 timer IC if I recall correctly)

mikee30 wrote: Fri Dec 01, 2023 12:12 pm Just a note - if the relay for the waterpump aux motor is dead, before buying a replacement, you can try replacing the Timer IC on the relay circuit board for ~1$ (555 timer IC if I recall correctly)

Thank you for the info. I will go ahead and buy the Timer IC and replace it on my old relay and see if it fixes it.

I bought a 555 chip from digikey. I haven't made the repair yet.

How difficult is it to remove the chip and solder it to the board? Any special equipment needed?

It’s pretty easy. Generally solder, a soldering iron, solder sucker and some solder wick is all you need. Assuming that it’s a plastic 8 pin dip package.