Dash air doesn't work

I recently had a similar problem with a 2007 Itasca Suncruiser 35L on the Workhorse chassis. I thought I carefully diagnosed the vacuum leak and improper operation to the vacuum control and ordered a replacement. After install, the problem persisted. Further diagnosis found a vacuum line that had deteriorated with pin holes in it. It was the vacuum line under the front hood that goes to the recirculation servo that is on the passenger lower side of the heater box. This line Tees under the dash. One part goes to the recirculation servo and the other one goes to the valve in the heater water hose. I eliminated the Tee under the dash with a piece of 1/8" rubber vacuum tubing and then put a Tee in the line under the hood to the heater water valve and added a new 1/8" rubber vacuum hose on to the recirculation servo. This eliminated the source of the vacuum leak for my problem.

Make sure you carefully check all the plastic vacuum lines for leaks. They can be replaced by 1/8" rubber vacuum hose that you can buy at any auto parts store. My plastic tubing under the front hood had pin holes in it from sun damage entering through the front end of the coach.

The vacuum control can be bought here:
Lichtsinn Motors
505 Highway 9 East
Forest City, IA 50436

641-585-3213
800-343-6255

You will need the Winnebago serial number for the coach. I think I paid about $60 for the vacuum control. BTW, it is a Evans part.

Again, really check the vacuum tubing for leaks. It is a lot cheaper than the vacuum control. Good luck-- Mick