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Technical Support / Re: Two isusses
« Last post by George Frudakis on August 18, 2026, 09:05:05 PM »All water outlets are hot
Recent Posts
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Technical Support / Re: Receiver Drier part number??
« Last post by Brian Fahlgren on August 18, 2026, 01:22:08 AM »Fred, having tech advice from a 49 year tech is greatly appreciated!! I spent most of my career calling on shops in my tool truck. I'd always joke that I knew who upset the service manager last because that guy would be out working on a motor home. You have my respect. Yes, there is a trinary switch just off the dryer. The only test I've done was putting 12 v to the fan with a Power Probe. I know the fan is good. Didn't get time today, but tomorrow I'll check voltage at the switch. Thank you again!
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Sources for Suppliers, Parts and Maintenance Materials / Re: Racor Filtration System
« Last post by Eric Drickersen on August 17, 2026, 07:06:09 PM »Just closing the loop on this post. Thanks for the assist, I purchased the o-rings and cleaned up the scuff on the plastic filter and the unit is working perfectly. I also took the advice of replacing the 1/4" tubing as a preventative measure. Thanks again to all!
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Technical Support / Re: Receiver Drier part number??
« Last post by Fred Brooks on August 17, 2026, 06:00:10 PM » Brian,
Somewhere near the dryer perhaps on the expansion valve side you should find the trinary or binary switch. This cycles on and off according to the temperature inside the evaporator. The other purpose of this switch is to save the compressor in the event the freon leaks, it removes the 12volt power to the compressor and the condenser fan if the internal pressure falls below the threshold setting of the manufacturer. Check to see if 12volt power is present at the switch when the a/c is on. Fred
Somewhere near the dryer perhaps on the expansion valve side you should find the trinary or binary switch. This cycles on and off according to the temperature inside the evaporator. The other purpose of this switch is to save the compressor in the event the freon leaks, it removes the 12volt power to the compressor and the condenser fan if the internal pressure falls below the threshold setting of the manufacturer. Check to see if 12volt power is present at the switch when the a/c is on. Fred
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Technical Support / Re: Receiver Drier part number??
« Last post by Brian Fahlgren on August 17, 2026, 01:35:38 AM »Just in case someone in the future needs this part number, here it is. There was a label on the dryer when I removed. It was a Parker brand, part number 110992. I couldn't find it on any Parker site, nor was I able to cross-reference the part number. Searching online, I found Aero Climate Control. Their part number, 1901000, was almost a perfect match. It was only $18.00, although freight was $26.50 lol. Pulled a vacuum for an hour. It sat for over 3 hours before I got back to it. It held the vacuum, so I recharged the system. I ran a portable fan aimed at the condenser while I did the re-charge. The coach's condenser-mounted fan never did kick on. The fan will run when I apply 12 volt directly. Now I'll be searching this site for a solution to that too. All to be expected with a 26-year-old coach!
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Technical Support / Re: Two isusses
« Last post by Joel Ashley on August 16, 2026, 07:03:31 AM »If a new black tank was installed, and for some unfathonable reason the installer messed with the nearby water manifold, perhaps a cold water out hose got switched there to an inlet coming from the hydronics unit. The question then, to help zero in on the wild concept, is the water hot at all cold spigots, or just one? On our coach, cold hoses are blue, so if a blue one is on a hot out manifold port that should be red… oops. That implies a complimentary red hose then was put on a cold out port, and some hot spigot somewhere onboard never gets hot.
Just shooting in the dark.
-Joel
Just shooting in the dark.
-Joel
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Technical Support / Re: Two isusses
« Last post by Carl Boger on August 15, 2026, 10:58:59 PM »George,
What kind of AC units do you have? If they are roof units, how did you check the freon? They are sealed units unless someone has added a saddle valve to it which can be done. Like was stated before, if your air vent temp is 20 degrees less than your air intake temp the AC unit is working properly.
As for why you only have hot water I am really not sure unless you have some sort of loop bumping hot water back into you fresh water tank. Have you verified the temperature of the tank itself? It is usually located between the upper frame rails in one of the storage bays. I have driven several hours before in near 100 degree weather and the fresh water tank and the storage area were very warm when we finally parked. The water coming out of the cold line was warm, but not hot like from the water heater.
Hopefully this help some.
What kind of AC units do you have? If they are roof units, how did you check the freon? They are sealed units unless someone has added a saddle valve to it which can be done. Like was stated before, if your air vent temp is 20 degrees less than your air intake temp the AC unit is working properly.
As for why you only have hot water I am really not sure unless you have some sort of loop bumping hot water back into you fresh water tank. Have you verified the temperature of the tank itself? It is usually located between the upper frame rails in one of the storage bays. I have driven several hours before in near 100 degree weather and the fresh water tank and the storage area were very warm when we finally parked. The water coming out of the cold line was warm, but not hot like from the water heater.
Hopefully this help some.
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Technical Support / Re: 3rd issue
« Last post by Frank Bergamo on August 15, 2026, 07:26:50 PM »The transmission may be running hot and setting off the light. Make sure the transmission fluid level is correct by checking the level on the shift pad. Have you cleaned the radiator stack lately? My 02” Marquis ran about 185 most of the time. If your engine coolant is running over 200, the transmission will be running hotter also, as they are connected by a transmission cooler that has coolant running through it. Hope this helps, good luck!
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Technical Support / Re: Two isusses
« Last post by David T. Richelderfer on August 15, 2026, 07:08:56 PM »Issue 1 - Is your Tank Fill valve open such that the water pump is recycling water? Perhaps the water in the fresh water tank is warm/hot from being filled several days or a week earlier while you were traveling in hot weather?
Issue 2 - Your text says "doesn't seem to put out a lot of cold air."
Do you mean a) the fan isn't blowing hard enough or b) the air is not cold enough?
a) Our ACs have three fan speeds - OFF, LOW, and HIGH. Perhaps your fan speed is set to LOW.
b) I was told that the air temperature exiting a properly working AC is 20 to 22 degrees cooler than the air that enters it. If you can check that, then perhaps you can rule in/out the AC's cooling ability.
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Technical Support / Re: 3rd issue
« Last post by George Frudakis on August 15, 2026, 06:58:23 PM »Thank you. Will try