Need some guidance

[Waterloo]

It is very rare anything goes wrong on the ProStar sleeper side of the HVAC. The only thing I have had to replace over the years I have owned my 08 ProStar is the blower motor.

Up front under the hood I installed one of these 12volt valves on the inlet hose to the heater core, I have a deadman’s switch on the dash, HEAT up, COLD down, OFF in the middle. {link invalid}

I also installed three of these yacht fans, they move some serious air and our extremely quiet. https://amzn.to/382kC37
Two in the sleeper just below the top ac vents and one up front hanging from the overhead. I have the fans on these remote switches so I can turn them off or on while driving. https://amzn.to/3806GGT

The AC in my ProStar will literally freeze you out. I have been in the middle of TN in July at 3pm on a blistering summer day and had to turn the heat on, it gets that cold, and is not at all comfortable.

For all of my AC parts, I like these guys out of Atlanta. They normally ship the same day your order is placed and they do sell many OEM parts at huge discounts. I have used them for a few years without issues... http://www.truckersac.com