2002 nissan pathfinder LE heat/AC fan stays on highest speed all of the time
I have the NAV system touch screen AC/Heat control panel, and though the panel shows a reduction in the blower speed, the fan blows at max now...is there a method to reset or reboot the system? Or, what else could fix this issue? Please advise, and thank you! firstname.lastname@example.org
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Re: 2002 nissan pathfinder LE heat/AC fan stays on...
Could be one of 2 things. It could be blower motor resistor or blower motor amplifier. If you have AUTO AC feature/setup, than it will be the amlifier. If you have manual AC than I would look at the resistor, but sounds like you have AUTOAC system, so get the amlifier checked. Its behind the glove box screwed to the air box assembly. 2 screws and its out. Hope this helps. Good luck and let me know what you found.
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Turn the blower fan on high and see if the heat goes away.
It may be the low speed fan resistor, sometimes it's directly behind the control.
Did you try other settings? Heat instead of AC, AC regular vs AC MAX, or just Vent?
You didn't tell us what vehicle or year and we're not the psychic hotline, so this is my best guess.
possible --if there is a pressure cap on it --if not then n you haven't mentioned when it over heats so here are a few answers
if it over heats all the time regardless have a compression test done--- have a flow test done on the radiator --check the radiator cap
if it over heats at lights ,in slow traffic or when the vehicle is goin slow with high rpms ( hilly work) but cools down when a road speed is achieved then replace the viscous fan hub or check operation of the electric fans
If the engine over heats but the temp gauge reads normal then bleed the air lock out of the cooling system
if it over heats at high speed then check the core fins are no falling off or there is nothing in front of the radiator preventing air flow,or check hat it is engaging overdrive,
If you have a fan that has different speed settings (1234, or low med high etc) and the only one that works is high - then the blower resistor pack has failed. If you have a climate control unit (where you just pick a temp you want) then the fan is controlled by the heating system and it sets fan speed. If you have climate control style try lowering the temp to a lower setting (current temp in vehicle) and see if fan slows down. If not then climate control unit or fan resistor bad. If dial type and you get nothing on lower settings (only high works like mentioned above) you need to change blower resistor. It is located under dash near the fan itself. Look for small unit bolted in duct near fan with wire plug going to it.
The owners manual gives a procedure for obtaining diagnostic codes from the Body Control Module (BCM) and displays them on the HVAC control display panel. Some things that may be at fault are, a defective heater pump, which will lead to an air lock in the system, or a defective blend air door motor in the heater and cooling unit assembly. It is system which can tax the patience of the best of diagnosticians.
First the switch this may not be bad switch it sounds like a bad blower resistor, this is what controls the speeds, the loss of heat may be low coolant level or a bad blend door actuator, depending on the heat/ac system in the van it may also be a bad vacuum leak in the engine compartment, some models use actuators to control system and some use vacuum, if the system looses vacuum the door will close until vacuum is restored, hope this helps.