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OTR Air / Condenser Blower relay ?
I have a 96 Liberty that has OTR that work amazing. Until the relay went out on the condenser Blower and left it running constantly. Even when I shut down and turned off everything I could find. I thought that leaving the generator running would keep the batteries charged, WRONG , I now know that it works off of the starting batteries which it drained , And I now have one day’s experience fooling with the batteries and trying to charge 4 batteries that are a 24 volt system.
Last night My Son and I pulled every Relay We could find in the front Drivers compartment. None of them would kill the juice to the Blower. So , How do I find / Replace the Relay ?
Any help or info links Greatly appreciated !
Thanks,
Rocky Lane
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7 Replies
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The starting point is a call to Prevost. It sounds as though the stuck relay is part of the motor circuit and it might be located in a box housing the control circuit relays and CBs. On my 96 shell the relays were contained in a white plastic box in the condenser compartment, but in a previous coach they were in a box located on the ceiling of the first bay so locations may vary.
Any time you have a situation as you describe (unlikely to ever happen again) you can kill the power at the swiches near the hinge side of the right side engine / battery door. Both the 24 and 12 volt switches need to be turned off.
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Have you opened door to condensor bay? On my 98 XLE there is a control box in behind the condensor. The condsensor swings out with the door. All the big power comes from the rear for the condensor fans. go to prevostcar website ; technical pub section; enter last letter in your serial number , like W then last 4 numbers; like 6553 then ck out wire diagram. example w-6553. In the box in the condensor compartment there are some 24volt ford type selonoids that are known for sticking closed. Shut off main power and see if any one of them are showing closed. Or easy trace wire from condensor motor to it’s selonoid and check it. Bob
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Thank You Very Much !
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Thank You for the tips ! Very Useful info for a Newbie !!!
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Rocky,
Every one of us was a Newbie. For some it was painful, for others, less so. The learning curve is steep and the very best thing a Newbie can do to make the experiences with the coach much more enjoyable is to understand resources are available for answering questions and learning the coach.
I believe most coach owner, operator and service manuals are available on the Prevost web site here:
http://prevostparts.volvo.com/technicalpublications/en/manuel.asp
Every owner should bookmark that page and go to it as often as necessary to learn about the coach. When my wife and I got our first Prevost Al Gore had not yet invented the internet as we know it so you can imagine how we were up against a very steep learning curve. But today with resources like the above link, a web site like this one and an ever expanding email list of other owners a Newbie is far less likely to have that deer in the headlights look.
The newbies that suffer, sometimes greatly are those that fail to ask questions or take advantage of the support from Prevost and the converters and other owners.
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AC solenoid switches and fuses:
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Great pictures JIm. For those who have recently questioned the OTR system, Jim’s photo is from the OTR condenser bay and the box is on the upper right rear. The bottom of the box has the circuit breakers for the condenser and evaporator motors. The solenoids (relays) are for the same motors and those can fail open or closed. If they have failed you can usually get them overnight from Prevost, but if you cannot wait a local NAPA store probably has them. Just make sure you get 24 volt coils.
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