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Old 07-09-2021, 02:24 PM   #1
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Evans HVAC vent actuator

I have a part that I think is the vent door actuator in the dash to control switching among the AC, heat, and defrost vents. Part is L1596 on a 1994 Itasca Suncruiser on an F53 chassis.. Yellow vacuum line is attached to it. Problem is the vent won't change from the heat vent, so I think maybe it is seized. I can't find this part anywhere. Any ideas what to do?

Sean
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Old 07-09-2021, 02:51 PM   #2
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Quote:
Originally Posted by semcha View Post
I have a part that I think is the vent door actuator in the dash to control switching among the AC, heat, and defrost vents. Part is L1596 on a 1994 Itasca Suncruiser on an F53 chassis.. Yellow vacuum line is attached to it. Problem is the vent won't change from the heat vent, so I think maybe it is seized. I can't find this part anywhere. Any ideas what to do?
Sean, I'm sure you thought about these but just in case:
1) Usually those actuators have a rubber diaphragm that connects to a metal lever. When vacuum is applied, the diaphragm contracts pulling on the lever. When there is no vacuum, a spring pushes the lever back in the other direction.
Can you move the metal lever by hand? If so then the vent is probably not seized.
2) Those vacuum lines are notorious for getting small leaks. Are you sure the hose is good?
3) The vacuum lines in many cases connect to a rubber coupler or fitting. Sometimes those are right angle fittings. They are also a problem in that the rubber deteriorates over time and leaks.
4) There are probably check valves and a vacuum reservoir in the system. These can sometimes fail as well.
5) Finally, the control unit mounted on the dash with the knob that controls vent/defrost/floor/mix/etc..can also develop vacuum leaks.

On my 2003 coach, I had a mess of vacuum problems due to aging of the parts and a rodent attacking the hoses. I bought a low cost hand operated vacuum pump at Harbor Freight that really helped to troubleshoot the problems.
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Old 07-09-2021, 07:12 PM   #3
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lever not moving

I have eyeballed all the vacuum lines and haven't seen a leak. The lines aren't brittle. Not to say that's not possible. The lever on the actuator does not move, even with some force.
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Old 07-10-2021, 09:05 AM   #4
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Can you disconnect the actuator from the damper door? Then you could see if the actuator moves when you change the dash control settings. If so then it is probably not an actuator problem but a stuck damper door problem.

Not sure of your configuration but you might be able to remove some vent hoses from the air distribution box with the damper in it. Then maybe get your hand in through one of those openings to get to the damper.
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