Fan only blows on high

[slowpokedodge]

Took my hvac box out and replaced the evaporator and heater core. Now my fan only blows on high. One thing after another goes wrong. Please tell me I won't have to pull it out again.

[AlpineRAM]

This looks like the blower motor resistor- easily swapped even without removing the dash and hvac stuff.

I would check the connectors first, maybe you did not plug it in correctly.

[dripley]

Yep. Your blower motor might be a little worn too. Neither one hard to do.

[Mopar1973Man]

If the resistor is blown that's because the blower motor bearings are shot adding extra load on the resistor.

 

...or did you forget to plug it back in?

[slowpokedodge]

I re-soldered the contact in the resistor. I guess the blower motor is going out. Thanks.

[Mopar1973Man]

3 hours ago, slowpokedodge said:

I re-soldered the contact in the resistor. I guess the blower motor is going out. Thanks.

 

Yeap the motor is failing soon.

[AlpineRAM]

On 9/30/2018 at 9:02 PM, Mopar1973Man said:

 

Yeap the motor is failing soon.

 

I cleaned my motor and put in new bearings, from some R/C model IIRC, and the fan lasts some years since then.

 

It usually overloads the resistor if the fan bearing gets hard to turn, increasing the amperage on the motor..