My fan isn't blowing hot or cold. I already changed the fuse but beyond that there are a few different things that i could think of, like the resistor, or the blower motor itself. How do I detect the malfuctioning part?
Why would the heat on a 2000 Chevy Trailblazer only produce heat when the temp dail is to the right to the red indicator, but produces cold air when the temp indicator is any where else on the dial. Thank
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Depending on the vehicle. There are a number of things to check. First check your fuses. You may have a bad heater control, a vaccum leak (depending on make and model of car) a short in the wiri g or a bad servo that switches from cold to hot. But first let the car get to operating temperature with the heat and fan completely of after the temp gauge goes up turn the heat on hot and the fan up. If it blows hot for a few seconds then back to cold then you need a heater core flush or heater core replacement
Check the air con drive belt is still OK.
Check to see if there is a slight change in the engine sound when the air con is switched on and off while idling - I'd get someone to do the switching while I listened under the hood.
If there's no change in sound (assuming whatever had to be switched on to enable air con to go, eg fan was operating) I'd check the fuse(s) for the air con.
If the fuse is ok, and you've already charged up the freon (not quite sure what you were saying there), I'd be taking it to an air con specialist.
your fan motor is located on firewall behind engine towards middle of car under a cover gain acess turn fan on inside car lightly tap back of motor if fan starts running you have a bad fan motor i assume you have already checked your fuses
Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going
The temp gauge not registering a hot engine is a real bane on Zetec engines - check your coolant level before you do anything else. It may be that the system was airlocked when you filled it and that you got less coolant in than you thought you did.
It takes quite a short to blow a 50A fuse. First, make sure that the fan you've been looking at is actually the one protected by the fuse. Find out if there's anything else it protects. Check that all the fans/motors downstream of that fuse are free to turn (stalled fan motors are particularly good at blowing big fuses), and check all the cabling in between paying particular attention to places where wires pass close close the edges of parts that might chafe against them.