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Search: Posts Made By: Bobn1957
Forum: Winnebago Class A Motorhomes 10-17-2023, 12:18 PM
Replies: 72
Views: 12,295
Posted By Bobn1957
I have an older unit that uses vacuum for the...

I have an older unit that uses vacuum for the HVAC controls and had a similar problem with hot air coming out at high engine loads, so I installed a ball valve! It's a bit inconvenient as the valve...
Forum: Winnebago Class A Motorhomes 03-25-2021, 11:35 AM
Replies: 72
Views: 12,295
Posted By Bobn1957
Chassis HVAC

I had the same symptoms last fall where under load the dash vents were pumping out hot air when the coach was under load. I'm leaning towards the fresh air inlet and determining its location. If the...
Forum: Winnebago Class A Motorhomes 03-14-2021, 02:30 PM
Replies: 72
Views: 12,295
Posted By Bobn1957
Under load at those RPMs there is less vacuum to...

Under load at those RPMs there is less vacuum to control the heater, I think you have a vacuum leak somewhere that's bleeding off vacuum and opening the heater coolant valve.
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