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My daughter had the same trouble with her 2000 escort. It was low on coolant. 2nd opinion: The most likely problem is the thermostat, which as I have read in here is a pain to get to.
No, the only thing it could possibly do is blow the bulb.
Could be low coolant, stuck thermostat, bad heater control head (if climate control)
Perhaps a bad selector switch If it is a bad selector can I replace the one on the dash (the one for selecting the vent) or is there some control module elsewhere in the vehicle that I can replace to fix the problem?
I would check in the engine compartment around the fire wall for a broken vacuume hose
If it's anything like my 92 Sunbird, (and they do have the same inherent problems), they are leaky cars (water wise) and it's probably wiring. There's a grounding problem it sounds like. I used to have a similar problem in my 92 when I used the cigarette lighter, it would blow the taillight fuse everytime. Replaced the cigarette lighter and problem went away. See, the cigarette lighter was rusted and the ground was faulty, so it would ground to the nearest fuse (which was taillight fuse) overload it, and blow the taillight fuse. Your parking lights are probably not grounded properly and it is doing the same thing my cigarette lighter was. Is it just me or are these cars just like the old Ford Tempo's and Dodge K cars, very reliable for the most part, but very leaky?!
I had this exact problem on my 2000 Montana. The neck of the thermostat housing has an air bleeder valve. Loosen this and let the air out until it runs mostly coolant and little or no air. There is an air lock situation preventing hot coolant from circulating properly. Hence, overheating and a starved heater core.
fuel injectors are pluged take them out and put a power and a ground to the wire ends and blow them out or just replace them
Biography - 1987 Blow by Blow was released on: USA: 8 November 2000
Behind the left side cover on the inside of the plate.
put on a new PCV valve.
blower motor resistor