1981 380 sl AC issues

[Mike329]

When I accelerate to around 25mph the ac total cuts off, but when i let off the gas it comes back on. I don't think its a vac issue, rather its electrical. I believe this because when i get to around 25mph Ill hear a click form the fuse box then the air stops blowing. Anyone know what's causing/ how to fix this. Thanks./

[daantjie]

Do you have the ACC (Chrysler servo) system? If so this is a classic symptom of a vacuum leak.

[Mike329]

Ahh, so to go about fixing this issue I need to find the vacuum leak?

[daantjie]

Yup. Start by checking the fresh air flap vacuum pod under the dash in the passenger side footwell. They are notorious for leaks after so many years.