Hey guys got a 99 max and my blower motor not blowing at all but if I push defroster switch it works ? So I don’t think it’s a fuse possible blower motor ?so is it hard to change ? Thanks

 

http://www.nicoclub.com/FSM/Maxima/1999/

 

what is it under ?

 

yes Very easy to swap out, Drop the glove box, and the straight bar across the lower section of the box, With a phillips screwdriver. and take out the three 8mm bolts holding it in place. Theres a 10mm nut on the right lower dash, remove the kick panel and remove this bolt, pull outward on the dash slightly to make clearance for the blower. install in reverse order.. Cudos.

 

HA.pdf

 

If the blower motor runs with the defroster, the motor is good.

Do you have the auto a/c or the manual?

 

Auto ac

 

If i can remember the name right i think it's called the blower resistor.

 

yea I just order one hope it solved the problem .. or could be blend door motor hope not ..

 

Had problems with blower as well. If you have it out make sure to clean very well each slot and use silicone lubricant or wd40 on the gears. I had to hit it to make it work. All I did was take apart clean and put together works perfectly.

 

It definitely not a blend door motor. The fan is completely independent from this.

The blower motor resistor is used with a manual control HVAC system. The auto control HVAC system uses a different part to accomplish fan speed. Nissan calls it "AC Auto amplifier". They are not interchangeable.

I'm not so sure it is the so-called resistor. The electrical current to make the blower motor spin has to go through the auto amp. And the blower motor works in the defrost mode. The auto amp is a fancy electric switch. Instead of your finger operating the switch, there is another switch sending an electrical signal to the auto amp. In this situation, there are 2 "fingers" operating the auto amp, the defroster function and the more obvious fan speed control.

I could be wrong about the auto amp being OK since you did not do any diagnosing on it. At this point, there is no sense giving you diagnostic info since you have bought a replacement auto amp. Installing a new auto amp will tell.

 

which gears?

 

Not a mechanic and I did this myself in 20 mins take apart and put together 40 mins clean time. I work with machines all day making them run but like I said I cleaned between the slots and wd40 behind the bolt then I made sure it spins well. And I was done in a hr.

 

This the top part I’m replacing the resister .. we’re is the auto amplifier at ? Or does this part do the same thing?

 

That is the fan control amplifier for the auto HVAC system. The 2 units look different, the resistor for the manual system is more of a straight line design than a square.

You have to tell the parts place that you have the auto a/c controls and hope they give you the correct part.

If you order from rockauto.com, they have several brands
Dorman # 973581 $77.99
Standard Motor Products # RU788 $67.79
Airtex/Wells # 4P1687 $76.79

 

The dorman part is exactly what I order .. plus it called a blower motor control Module /resistor got be same thing .. just Nissan names it a blower amplifier..

 

The blower resister on the manual hvac controls1-4 **** speed. The auto climate should have the same type of control device. The name can be different and the way the device works auto/manual it should be identical. I know the auto climate uses the temp measure and the sensor to detect the car interior temps and calculate off of that reading.

 

I would also recommend changing the blower motor as well. Not sure how it works with the auto ac but with the resistor the number one cause of failure in my experience has been too high of an amp draw on the fan motor which overheats the resistor.

 

Auto/manual you have the blower motor that has to blow air to get the air coming out the vents.

 

yes it does blow on defroster but won’t blow Thur the vents .. so it’s the mode motor that is shot ..