A/C Issue

[DavidInJackson]

I am hoping someone can give me some guidance on an issue with my A/C...

It will run for a while just fine, then you can hear what sounds like a door shuts/opens and it begins blowing hot air...if I turn the A/C off, wait a few minutes, it will again start blowing cold air for a bit, then change to heat again...

I assume that it is some kind of vacuum leak, but when trying to find a vacuum diagram I can't seem to determine which of the hundreds that are posted is the one that I need, or would show me where to look...

Any help/assistance/guidance would be greatly appreciated

 

[DodgeTx]

it could be a few things, but there is a line by your condensor (generally the black sometimes silver round thing next to passenger side engine compartment by cab.) make sure that is connected to a vacuum line that runs around the back of the motor. I can't get you pics today, but its on the side of the intake, and has a few other vacuum lines on it.

 

[DavidInJackson]

Thanks DodgeTx...I will take a look this weekend, if the weather permits...

 

[dudeman2009]

You'll want to try and check that line that DodgeTx mentions, but the blend door is servo actuated and primarily what controls heat operation. I'd also take a look at that to see what its doing. You can listen to it with the key on, vent select set to off and turn the heat select switch from hot to cold. You will hear it best in the passenger footwell up against the trans tunnel. As DodgeTX mentioned, you may want to inspect all the vacuum lines under the dash but also under the hood, a visual inspection and a quick by ear feel is probably all you need.

Does this occur if you start to climb a hill? or otherwise hit the gas?