darek_u

Car is 88 Turbo S, I'm buying bunch of parts and there is still space in the box, seller offers me a resistors ('almost' new, from '95 968) for cooling fans (not AC) but I wonder if it makes a sense to spend money on them and keep as spare? Resistor = no moving parts = no failure? Do they fail at all? What is your experience?

Grandpa#3

Normally the resistors themselves are not the problem. The wires get hot, insulation gets brittle and flacks off. The wires get corrosion build-up and resistance gets higher. Check your resistor pack under the right side under the window and see what shape the wiring is in. You don't need a spare except for a DME Relay.

Cheers,
Larry

darek_u

I have already replaced approx. 10 inch of each resistor cable when renewing the cabin harness - they were not too bad but slowly started to brittle. The resistor pack itself looks ok to me. I think I will quit the idea of buying the spare ones.

Van

I have had to replace a few of the HVAC resistors - this lives in the blower box near the fuse box in later cars. If your fan only works on one speed, that's the issue.

Landseer

I just today strung new wires on an 85.5 944. Son's 951 has broken resistor laying in floorboards.

Tom M'Guinn

If I read PET correctly, they are supposed to measure .9 ohms each. Might just put a multimeter on them (directly) and see what they say. I've long suspected that increased resistance (from old wires mostly) and slower fan speed is why the temp needle creeps up at idle on some cars even though the cooling system is in good shape.