So, I should probably start by apologizing for bringing up this topic, since it's been beaten to death so much on here, but I've been through everything I can find and could really use some advice on how to proceed
It's a 2007 CX-9 AWD
The problem started with both the rear and front blowers going out. Started with replacing the fuses, then the relays, which only got the rear working again, not the front. This is when I learned about the issue with the AC condenser, which definitely turned out to be part of the problem. Was able to get it all drained out using the shop vac method, and just assumed the blower motor was toast (shorted out), so I went ahead and ordered a replacement. Very easy swap, but the motor still doesn't kick on
I've gathered a fair amount of information so far with my fluke, but haven't been able to pinpoint if I should replace the blower motor resistor. Does anyone know a proper test that would tell me for sure that the resistor is bad? I've tested the motor using a separate 12v source, and it seems to be fine. And when I have the car running, I can slightly connect and disconnect the cable going to the motor, and it kicks on very briefly. Sticking the meter on the motor cable shows that I have battery (~14v) with the cable disconnected, and it drops down to 0v when connected to the motor (good chance the resistor is the problem maybe??)
I also thought it would be interesting to take some measurements on the resistor assembly itself. There are two visible resistors that check out to ~2.1k and 1k, but the 2.1k resistance reading also drops to 0 when the motor is connected (bad resistor possibly??). Voltage readings on the resistor assembly are the same. ~14v when the cable is not connected to the motor, but 0v with the motor connected
Is this enough information to say for sure that the blower motor resistor needs replaced? Or is there something I'm missing? Still trying to find a schematic of the HVAC system in the manual, but haven't found it yet. Haven't been able to locate the part at a junkyard, and it looks like the cheapest I can find it is $105 on partsgeek. It was easy to spend 40 on the replacement blower motor, feeling that it needed replaced regardless. But I'd really hate to be guessing wrong on the resistor since it's a little more expensive
Any help is greatly appreciated! And hopefully this hasn't been answered yet, cause if it was, I couldn't find it (and I read through a ton of threads on this issue, believe me)
It's a 2007 CX-9 AWD
The problem started with both the rear and front blowers going out. Started with replacing the fuses, then the relays, which only got the rear working again, not the front. This is when I learned about the issue with the AC condenser, which definitely turned out to be part of the problem. Was able to get it all drained out using the shop vac method, and just assumed the blower motor was toast (shorted out), so I went ahead and ordered a replacement. Very easy swap, but the motor still doesn't kick on
I've gathered a fair amount of information so far with my fluke, but haven't been able to pinpoint if I should replace the blower motor resistor. Does anyone know a proper test that would tell me for sure that the resistor is bad? I've tested the motor using a separate 12v source, and it seems to be fine. And when I have the car running, I can slightly connect and disconnect the cable going to the motor, and it kicks on very briefly. Sticking the meter on the motor cable shows that I have battery (~14v) with the cable disconnected, and it drops down to 0v when connected to the motor (good chance the resistor is the problem maybe??)
I also thought it would be interesting to take some measurements on the resistor assembly itself. There are two visible resistors that check out to ~2.1k and 1k, but the 2.1k resistance reading also drops to 0 when the motor is connected (bad resistor possibly??). Voltage readings on the resistor assembly are the same. ~14v when the cable is not connected to the motor, but 0v with the motor connected
Is this enough information to say for sure that the blower motor resistor needs replaced? Or is there something I'm missing? Still trying to find a schematic of the HVAC system in the manual, but haven't found it yet. Haven't been able to locate the part at a junkyard, and it looks like the cheapest I can find it is $105 on partsgeek. It was easy to spend 40 on the replacement blower motor, feeling that it needed replaced regardless. But I'd really hate to be guessing wrong on the resistor since it's a little more expensive
Any help is greatly appreciated! And hopefully this hasn't been answered yet, cause if it was, I couldn't find it (and I read through a ton of threads on this issue, believe me)