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This is a result of dust and other debris that has accumulated on the coils or in the heater. When you turn it on, it begins to burn off and that is what you smell.
Yes or they will overheat.
There should be a dial on the front of the heater that you set the temp. with.
It depends on your car, but should be very obvious.
coolant level could be low not letting it circulate through the heater core, causing it to blow cold. Also, if the coolant level is low it will in turn overheat.
Turn on your vehicle's heater
Personally I do not know about a G20 1990 Chevy Van but the basics of heating are, the thermostat, heater control valve, heater fan and heater matrix. Does the van overheat at all, engine wise? Could be possible the system just needs a flush out. When you turn the heating dial (presuming it is a dial) you should hear a clunk which normally indicates the heater control valve switching over. Other than that, I've said all I can. Hope to be of some help, hope you get it sorted out.
yes because 360s do not have an internal fan and your 360 can overheat. they do make 360 fans so then it will prevent your 360 from overheating
More then likely, your thermostat is sticking. When this happens, your car tends to overheat. If you turn on you heat, it keeps your car from overheating for a little longer then if you left it off. If you see your car is starting to get hot, turn on your heater, but try to get to wherever you needed to go, or to the nearest trustworthy mechanic.
You should check and adjust the heating temperature, then turn on the cold water to fill the tank.
Raise the hood find the heater motor tap it with a hammer. It should run.
Turn on your vehicle's heater