The interior blower fan is not working when you turn it on

I change the blower and it still does the same thing. It turns on but cuts right off. I am wondering if the blower motor resistor could be bad.

My blower for a/c and heat does not work. Where do I start?

Try replacing the motor first. (plenty available at the junk yards) While it's out check to see if it's good by hot wiring it to the battery. If it is perhaps, your blower module is bad which is an expensive part. Hopefully it's bad and that's all you need to replace.

This guide can help us test it

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Please run down this guide and report back.

My air conditioner works just fine, my heat does not blow at all! What is the problem? How do I figure out what is the issue?

Thanks

Where is the vacuum located?

The inside interior fan does not work when turned on.

Blower motor will not work.I hook up a direct 12v. To it and it runs.I check relays and they click, fuse's are ok.I took out the blower resister and it shows no signs of excessive heat.I put it back together and the blower work for a short time on med. Speed and stop all together, this is a auto temp control unit. Its getting no power to the blower motor, what can it be? Thanks

Is this what you call a blower motor control module? It was the problem

When driving the heater turns on then shut off and comes back on all on its own

Im trying to help a struggling single mom with her car. It has the manual heat and a/c controls. At first her blower motor would stop for a few days, then come back on. She said it came on at times when she'd hit a bad bump. I've read of a worn motor working intermittently like that, but I checked at the connector and there's just no power going to the motor. A couple times I replaced both relays, each at different times (one is for the high speed and the other in general), and both times it made the blower work, but eventually it would stop again. This is over the past year. Replaced the resistor too cuz I didn't know how to test it. A week ago now her radio also went out. (And perhaps unrelated but she's has an intermittent starting problem cuz of the passkey/security light thing.) I'm wondering if the ignition switch could be bad, seeing as how its normal function is to momentarily turn off the radio and blower and such when turning the key (the key switch itself was replaced a couple years ago when it wouldn't start due to those two thin white wires running to the anti-theft setup). Please help. It's hot here in the South and single moms have such a heavy burden as it is.