Blower Motor Erratic Car has Climate..

[Frontstep]

My fan goes from hero to zero on an irregular basis.
It seemed to be classic brushes worn issues never reaching its full speed and then refusing to start and then it would.

When I took the motor out the brushes and commutator were very worn so I thought fine I have a spare.
But when I got it out it was slightly different but I was stuck in the house so I made it fit.
I think I have fitted a none climate lower amp one.
It started fine then went off after a while so I left it.

Went out later fired up great and went for a few miles plenty of wind.

Then it wouldn't start again.

The resistor was the original a new one a couple of years ago for what its worth.

Is it a case of the wrong size motor not working with the original resistor?

 

[mattkh]

Try cleaning the fuse or even replacing it.
Could even be the relay playing up in which case clean the contacts and try.
What happens when you supply power to the blower directly, does it keep running continuously?

 

[bembo449]

I think id be tempted to replace both with new to rule out any other variable

 

[Frontstep]

Is that the car and the blower then

 

[Frontstep]

Try cleaning the fuse or even replacing it.
Could even be the relay playing up in which case clean the contacts and try.
What happens when you supply power to the blower directly, does it keep running continuously?

The motor runs great with its own power supply I tested it before fitting.