So I have been dealing with a stuck power seat on the passenger side. The front part of the seat was stuck on the full high position. The motors seemed to be ok, and the seat was working in all other directions. So I figured that the power seat microswitch must be malfunctioning. Before buying a new...

The oil cooler lines on these cars are known for leaking where the rubber hose is crimped to the metal ends. Mine have been leaking for about 4 years, but it was a slow leak. Today I decided to repair them. The Volvo replacements are a steep $250 for the pair. There are aftermarket brands but the re...

Turn the switch on, go to the back with your voltmeter and see if you can find 12V there. Look for corrosion in the socket, it is common.

There’s no relay. If the switch illuminates when you turn it on,
that indicates that power and ground are both present at the switch.
Power leaves the rear fog switch on pin 4, the violet/white lead, and
runs through fuse 25 in the “C” box back to the fog light. Is that fuse OK?

I usually check for voltage when the fuse is in place. Look for 12 volts on the two metal nibs on the top of the fuse. If you have voltage on one side, but not the other, there's your bad fuse. If there's nothing at all when the switch is active, I'd suggest getting to the back side of the switch an...

I know it sounds really simple, but have you tried just changing the bulb? I have had a few occasions where the bulb may show continuity but didn't actually work. Swapped the bulb and all was good.

Neil.

If you don’t have 12 volts at the lamp bulb, you trace backwards until you find the 12 Volts.

One weak spot on these cars is the wiring harness in the left tailgate in North America, I’m not sure if it’s wired the same side in UK but it is worth exploring

Great! you can send me the pics and Ill attach to the thread - since you guys are Brexiting we don't allow UK pictures anymore without a 25% tariff on MVS membership fee.

(seriously, its nice to put them in the thread for reference)

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The fan run-on is usually the sign of a bad ECT sensor. The coolant forcing its way past the reservoir cap isn't normal, and shows potential of pressurization of the cooling system, perhaps via a bad headgasket. That or some other blockage in the system (bad radiator, bad thermostat, etc). By "...