Rear Axillary heater core question

[opfor2]

discovered that I have a small leak in my rear axillary heater core. I just ordered a replacement OEM core from Rock Auto. Do I need to evacuate the AC system in order to replace the core?

 

[opfor2]

So no one's had to replace their rear axillary heater core?

 

[petethepug]

It is the first I’ve seen of a rear heater core going. I’m curious to see if it had plastic end tanks or solid like an a/c core.

I can see that you’d have to evaq the system to get the heater core out. Fingers crossed.

 

[opfor2]

It is the first I’ve seen of a rear heater core going. I’m curious to see if it had plastic end tanks or solid like an a/c core.

I can see that you’d have to evaq the system to get the heater core out. Fingers crossed.

Ya I guess they really don't leak that much for your the only one who answered up. I really don't want to deal with the AC however if I have to I have everything needed. My service manual stated that the AC must be evacuated but sometimes there is a work around. I guess we will find out. I received the OEM core today lol

 

[petethepug]

You’ll be delving into this once the panels removed. I can’t see how gm could of integrated the heater core into the evap coil but you’re right, we’ll see.

 

[strutaeng]

Interesting. I don't even know where the rear heater core is on these SUVs.

It's leaking antifreeze/coolant, right? Where does the leak show up? Inside? It's the same lines that tee off from the front heater core connectors near the firewall?

 

[opfor2]

its leaking coolant out of the drain hole and you can smell it while driving.

 

[opfor2]

You’ll be delving into this once the panels removed. I can’t see how gm could of integrated the heater core into the evap coil but you’re right, we’ll see.

I think they are separate units

 

[opfor2]

I'm revisiting this issue for my leak seems to be getting worse, so has anyone replaced their rear auxiliary heater core? And if so any recommendations??

 

[petethepug]

Here’s the sawzall method of removing the rear hvac. I’m going to assume the heater hoses he cut are readily available for replacement though.