Hello. Replacing both the heater and AC cores on my 2003 4.7 Durango. Got the dash out and steering column lowered. Cannot find the 4th pesky bold on the firewall. Anyone have a location for this allusive monster?

Thanks much.

Below are some images.


Passenger side towards center of engine compartment.
Passenger side near AC core.
Drivers side near heater core.

 

I think it's behind the PCM

 

 

Thanks for the responses. After a few hours of hunting I found the last bolt. It was hidden by the foil thermal barrier. The bolt is directly behind the oil indicator tube. It was a tight fit.

 

Does anyone know the gasket part numbers or sizes? The local auto parts store was no help. I need the gasket for the AC evaporator, and the O-rings for the heater core assembly.