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Could be the air flaps of the heater unit are set incorrectly or not working at all or possibly the heater radiator is blocked or semi-blocked or perhaps there is something wrong with the heater hoses or the heater water valve if one is fitted.
These things need checking before a cause can be established.
I am sometimes called upon to flush out a heater radiator. Sometimes it works and sometimes it doesn't and sometimes it causes a leak and the heater radiator must be replaced. Not an easy job on many vehicles made in the last couple of decades..
DON'T slam the glove compartment, that's near the passenger airbag. Check fuses for the fan, and the motor for the fan. The fan works sometimes, which means power is getting to it, might just need to be cleaned or replaced.
check your coolant temperature. put all your knobs into full (blower, heater). and see if the temperature rises higher than the normal temperature of your vehicle.
if this happens, you have overheating problem. something wrong with your radiator.
your Fan must on and open up your hood to see if it is working while your vehicles engine running with the heater and blower on fully.
if not turning, then you have problem with your sensor (temperature sender sensor) attached to the fan wires to the radiator.
if you have engine leaking, sometimes an oil build- up around the engine cause hot temp and burning smell.
you need to replace the blower motor resister. on the inside, passenger side glovebox area or near the center. really easy to do. unplug the wires and take out a couple of screws, its that simple
It's easy to replace, just a few 7mm screws holding the blower motor fan in.
I would check the electrical connector that plugs into the fan motor first. make sure it's making a good connection and not burned.
Hope this helps :)
OK..Assuming the fuse and relay are ok i would kick the lower part of the dash. This sometimes jolts the fan back on. Here is what it could be.
1 fan motor
2 blower motor resistor
3 Blower motor switch
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