Need assistance with FSR or blower?

[RacingNight]

This is a proactive post to ensure that I can order all I could need—I have not yet dug in another.


The problem is that my HVAC system turns on, but no air is being expelled. Nothing wrong with the back HVAC. I had a lengthy, chilly trip this morning, so that was a godsend.

Fsr is the only one that has shown up in my research. Is anything else required?

I've had no problems with anything up until yesterday night. Driving was the only strange thing; I turned up the heat, but it wasn't too hot. Thus, perhaps it was fuelling up on my journey. In most cases, I only need to turn on one or two lights for the blower to do its job. I just attributed it to the cold weather and didn't give it much thought.

It's a supercharged 2008 model. The fan isn't making any noise at all. Absolutely nothing. To reiterate, it appears to be functioning because the lights turn on.

Please inform me if there is anything else that needs to be checked or replaced. Also, is one particular brand recommended?

[Starat]

Will the blower fan turn on under the same conditions if you set it to maximum defrost?

[RacingNight]

Oh no, it's not. Assuming this is what you mean. The front HVAC system remains turned off when the back system is turned off.

[Starat]

It seems like your HVAC module is functioning properly because the lower speed switch has the correct number of orange dots glowing on its outer band for a defrost instruction.

A faulty commutator on the armature of the blower motor itself or an FSR problem could also be to blame :(.


To test if the blower motor turns over when connected to a different 12v supply, you can unhook the FSR connector and bridge the pins to the motor. This will help you diagnose and rule out the blower motor as a possible problem.

[Markwe]

to verify or disprove the possibility, connect directly 12v to the blower. I thought the heat resistor was a typical place for them to break.

[Starat]

Once the FSR is fully placed, it is secured to the HVAC box using a plastic clip/detent.

To detach, just pull the fastening clip in the opposite direction and remove the FSR. To disconnect the electrical plug, compress the two symmetrical retention clips on the connector.


To help you identify the two stronger wires that connect the outlet to the blower motor, I've included some images in this email.

In case you were wondering, I "send" 12v to the blower motor during testing by using a little Lion battery with a pair of crocodile clipped wires.

It makes no difference either way you connect the 12v supply to the blower motor if the plug is detached from the FSR. Connecting it in a "backwards polarity" manner will just cause it to spin in the opposite direction of original rotation.

[RacingNight]

Have you connected the power? If so, where? A power probe will be ordered by me. With the pins? Or perhaps to the FSR?

[RacingNight]

Fascinating development. Here is a little heat that I have. I was using the rear seat heater while driving, but I can't tell if the blower motor is functioning or not. I realised I was getting heat from the vents after turning it off but leaving the front running. A minuscule amount. I am uncertain if this suggests any alternative paths. In any case, I've been wanting a power probe for my classic for a while now, so I'm going to get one from the fsr just in case.