Hey everyone

I’ve recently noticed a problem with my rear air conditioning system. It seems like the evaporator is leaking, as there’s a puddle of water forming under the vehicle after running the AC.

The rear vents aren’t blowing cold air like they should either. Has anyone else encountered this issue?

Could it be a simple fix, or is it something that usually requires professional help?

Thanks in advance for your help!
Pentagon Detailing

I’m planning to inspect the evaporator for any visible signs of damage. Do you think this could be the cause, or should I check something else first?

 

The puddle of water is normal. That is where the condensation drains.

Rear AC failures due to leaks are a known failure and documented in this forum. It's a time consuming repair. Many with the issue just use a line block off kit to shut down the rear AC.

 

I have a 2015 Acadia that likely has the rear leaky evap coil. Ran dye test, nothing shows but no way to get to rear coil to look for dye without disassembling. I'd like to just disable using the line block you mention. Do you have a recommended part for that?

 

Hey everyone

I’ve recently noticed a problem with my rear air conditioning system. It seems like the evaporator is leaking, as there’s a puddle of water forming under the vehicle after running the AC.

The rear vents aren’t blowing cold air like they should either. Has anyone else encountered this issue?

Could it be a simple fix, or is it something that usually requires professional help?

Thanks in advance for your help!

Depends on your skill level. Accessing the rear evaporator isn’t bad. The front one behind the dash? Yeah, that is a job. In order to diagnose this, you need to check the system pressures to start, and go from there. If you aren’t knowledgeable of air conditioning systems, let a shop handle it.

 

I don't have a recommended part. I would just do a google search for a rear AC block off kit.