A 1996 Volvo 850 turbo was running hot. The owner changed the relay, the cooling sensor, and the fan. It still ran hot, and the fan would not trigger on. Hmmmm.
The resolution? “I just looked around for lose wires, turns out I did not reconnect a black ground wire. (Remember I changed the engine.) The wire has a round connecter and I found a bolt on the block that was doing nothing so I bolted the wire down. Could this have been my problem, my fan was not grounded?”
And that’s exactly what it was. We here at MVS Volvo Forums always suggest looking for the simplest solutions first, then moving toward the complex or costly.
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