A/C randomly shuts off

[LimerocK5]

Hey all,

I’ve got a 91 with a 350. The air conditioner randomly and abruptly shuts off. What the hell?? Blower motor bad?

 

[6872xtc]

Hey all,

I’ve got a 91 with a 350. The air conditioner randomly and abruptly shuts off. What the hell?? Blower motor bad?

You will need to be more specific and do just a little diagnostic work before an answer will be close.

Are you saying that the air flow stops?

What setting is the fan on when it happens?

Does the compressor stay engaged and turning?

 

[LimerocK5]

Lol…. I guess that would help, thanks….

Yes, the airflow just stops. It has been on max high

The compressor stays engaged and running.

 

[6872xtc]

Ok, I would start by checking the power at the high speed fan relay on the A/C box under the hood. It could be opening up under heat and load, OR it is losing power feed to it.
If I remember, there is a separate fuse dir for high speed. I have seen the fuse lose connection to the terminal in the fuse panel, but could be elsewhere.

Also, check the motor ground.

If it stays running on the lower fan speeds, you shouldn't have a blower motor problem.

 

[LimerocK5]

Will do! Appreciate it. I’ll let ya know.

 

[88Silverado]

I had a similar issue and turned out to be the contacts on the fan switch.