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by Gary Bohn
(San Jose, CA USA)
I have a class A 1985 33ft automate royale motorhome. The control switch for the air/heater on the dash has broken. I have found that a Denso #146430-3450 will work and I have found one and it is being shipped now. I need to know how to hook up the four vacume lines going to it, I can not find it anywhere. Maybe you can help me. I sent in another question that you helped me alot. Thanks Gary
ANSWER Hi Gary, well I am glad I was able to help you out with your other question. I am afraid I may not be as much help on this one. Let me go back in my memory to my mechanic days. First, I hope you have not already removed the old switch. If you are very lucky the new Denso switch will have the same vacuum port configuration as your old one. If it does, it is just a matter of switching the vacuum lines off of the old one to the new one.
If you have already removed the old switch and as well as the vacuum lines then it is going to be a matter of trial and error to get the lines on the right ports. Also if you are lucky the vacuum ports on the new switch will be labeled as to what they do. But, this will do you no good unless you know exactly where all of your existing vacuum lines go. Tracing where these vacuum lines go can be a pain in an RV.
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