Dash vent - AC and Heat issue...
Hi All, I've got a 2006 Four Winds Class C 31P Chateau. When I acquired it about 6 months ago I noticed an issue with the dash vents. The air (AC or heat) was only blowing out of the defrost and ...
Forum Discussion
The lack of vacuum and going to defrost is not a safety design, it is just that all other functions require a vacuum
1. The BEST way to fix this problem and it is COMMON to Ford Chassis is to install a 12 volt Vacuum motor. This is the same motor Diesel motorhomes use since Diesels do not have a vacuum source up front.
2. The 2nd way is to install a 2nd Vacuum Reservoir canister to double your stored vacuum.
You problem is, on hi RPM loads on the Ford engine, you deplete all the vacuum in the Reservoir. Since the Engine is NOT generating vacuum, once the vacuum is lost the controls close/open the various doors on the Evap box and the air blows out the defrost. Doug
PS, all Motorhome Dash Vacuum controls have inherent small leaks. The motors and such will bleed a little and you cannot make them completely "tight".
https://www.partsgeek.com/gbproducts/MC/5337-07017433.html?utm_content=MC&utm_term=1999-2007+Ford+F250+Super+Duty+Vacuum+Pump+Dorman+904-214+99-07+Ford+Vacuum+Pump+2005+2004&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=EAIaIQobChMIo7y9p_q-2QIVQmt-Ch1J4AYFEAQYASABEgLTMPD_BwE&ad=47362750812
1. The BEST way to fix this problem and it is COMMON to Ford Chassis is to install a 12 volt Vacuum motor. This is the same motor Diesel motorhomes use since Diesels do not have a vacuum source up front.
2. The 2nd way is to install a 2nd Vacuum Reservoir canister to double your stored vacuum.
You problem is, on hi RPM loads on the Ford engine, you deplete all the vacuum in the Reservoir. Since the Engine is NOT generating vacuum, once the vacuum is lost the controls close/open the various doors on the Evap box and the air blows out the defrost. Doug
PS, all Motorhome Dash Vacuum controls have inherent small leaks. The motors and such will bleed a little and you cannot make them completely "tight".
https://www.partsgeek.com/gbproducts/MC/5337-07017433.html?utm_content=MC&utm_term=1999-2007+Ford+F250+Super+Duty+Vacuum+Pump+Dorman+904-214+99-07+Ford+Vacuum+Pump+2005+2004&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=EAIaIQobChMIo7y9p_q-2QIVQmt-Ch1J4AYFEAQYASABEgLTMPD_BwE&ad=47362750812
