Geoff Weeks Posted 3 hours ago Share Posted 3 hours ago The solenoid is likely a continuous duty solenoid to switch power on with the key switch without all that power having to pass though the key switch. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75888-cruiseliner-transformation/page/8/#findComment-590039 Share on other sites More sharing options...
Geoff Weeks Posted 2 hours ago Share Posted 2 hours ago Getting back to the coolant valve. Could you post a picture of the heater/AC controls? If it is the Red Dot control I am thinking of, the air would come from it, when in Max A/C. Red Dot made lots of the heaters for trucks and would stencil the truck makers name on the controls. The one in my Marmon IIRC has one port that has air in the A/C position. Some one might have disconnected and plugged it at the control. Quote Link to comment https://www.bigmacktrucks.com/topic/75888-cruiseliner-transformation/page/8/#findComment-590042 Share on other sites More sharing options...
fjh Posted 1 hour ago Share Posted 1 hour ago 1 hour ago, Geoff Weeks said: No air = valve open, air to the valve = valve closed. They can stick, and leak as can any valve. I used them for heater and fuel heat control. They make air switches that look a lot like electrical switches from the front end, to control them manually those valves are "directional" in that they are only supposed to be used with the flow in one direction which is marked on the side of the valve with an arrow. While they can fail, I wouldn't say it is a common problem. I've used them for decades and not had a failure. I've had cable operated valves fail also. Note: those are either open or closed, there is no part way or throttling to adjust heat. Some A/C controls will supply air to the valve when in "max A/C" to stop all coolant flow in the heater core for better cooling. If you want, you can bypass it and see if you get heat, just put a straight tube between the hoses. I often see them in bunk heater -A/C units to turn off the coolant to the heater core when not in use. Yup on the money there bro! In the mh era these used to be one of those things you checked for before chasing a head gasket failure on the E9 ! Quote Link to comment https://www.bigmacktrucks.com/topic/75888-cruiseliner-transformation/page/8/#findComment-590046 Share on other sites More sharing options...
cruiseliner64 Posted 11 minutes ago Author Share Posted 11 minutes ago Thanks for the replys.I will post a picture of the heater A/C controls as soon as I can.As our summers are not that warm A/C has only become popular since the EU mandated it for all new vehicles in the last 15 years or so.As a result Iv not much experance with it so decided to ask before just tearing it apart.I will bypass that tap and see if it gives any heat.The electrical switch does power up one side of the fusebox when the key is turned on so I think your spot on with that Geoff.Thanks again for all the replys.... Paul Quote Link to comment https://www.bigmacktrucks.com/topic/75888-cruiseliner-transformation/page/8/#findComment-590053 Share on other sites More sharing options...
mowerman Posted 8 minutes ago Share Posted 8 minutes ago Good luck Paul. I really don’t have anything to add on this one…. Bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75888-cruiseliner-transformation/page/8/#findComment-590054 Share on other sites More sharing options...
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