The heater motor makes a loud noise when the temp gets below 20

Have you inspected the fuses?

If the fuses are fine, check the wiring to the fan resistor has power in and out.

You could run a test wire with power to the fan and test operation independently, (make sure it has a fuse in test wire).

Its either the fuse, the fan motor or a wiring fault, (eg rats have chewed it).

the engine temp sensor on a 1992 240 (b230f engine) is located on the passenger side of the engine, right next to the oil filter and right above the alternator. good luck :)

it should be located under the car below the drivers seat. it will be a silver canister, like an oil filter

Check the left front fender area under the hood. If it is not there, it will be located under the car, right wheel area.

look for the manual its inside there or go to volvo website and they will get you it

timimg belts usually don't make noise, they break and the motor stops!! The noise could be coming from a bad water pump, powersteering pump, air compresser, alternater, leaky exhaust, leaky vacume lines. Check them out. Or, I don't know the condition of the engin. Has it been neglected and are the bearing going? More history would be helpful.

you may want to check the fuel pump relay. this is a common problem

MOUNT ON BACK OF SEAT FACING IN TOWARD FRONT OF CAR OR PLACE BOX FACING BACK TOWARD REAR WINDOW FOR BEST SOUNDS.

chips wont do much for this car

I tink you have to replace the catalyst for better acceleration probably is blocking the combustion that's what you loosing power, I have 240 wagon 92 and i just did it. my 184k miles good luck.