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Old 09-22-2015, 05:23 PM   #1
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AC problem

I turned the heater on to check it and now the ac will not come on front system
Allegro bay 2000
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Old 09-22-2015, 06:01 PM   #2
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When you say "turned on" do you mean you turned the temperature control from cold to hot? If so, it is likely that the hot water flow control valve is stuck open, even though you are now wanting the system to blow cold air. The problem is likely to be that the AC coil simply cannot over come the heater core (both are in the same air stream) being fed with 200+ degree water. This assumes your AC compressor is working and engaged.


The simply way to test my theory is to use two pieces of flat wood (like a paint stirrer) to protect the hose while you CLAMP OFF the hot water hose to the heater core. If the other hose coming from the heater gradually cools off, and the vents begin to blow cool air, then you have proved the hot water control valve, which is operated by the dash controls, is stuck open. You can either fix it or replace it. OR, you can install a simple ball valve in either heater hose to ensure the hot water isn't circulating unless you actually need heat. This method has been used by many, but it lacks the convenience of the "adjustable" valve connected to your dash controls.
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Old 09-22-2015, 06:38 PM   #3
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Are you talking dash AC or roof AC?
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Old 09-22-2015, 09:23 PM   #4
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Quote:
Originally Posted by jacwjames View Post
Are you talking dash AC or roof AC?
The OP said "front system" and my comments were related to the chassis AC system (dash) for a front engine chassis, which I believe he has.
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Old 09-23-2015, 05:17 PM   #5
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Are you talking dash AC or roof AC?
Front roof ac
Replace 3amp fuse inside the front unit fan works
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Old 09-23-2015, 05:20 PM   #6
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Front roof ac
Replace 3amp fuse inside the front unit fan works
just no ac nothing comes on when at the thremasat button is pushed up to cool
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Old 09-23-2015, 06:39 PM   #7
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Is your AC unit one with a heating coil or is a heat pump.

If you have a heat pump the reversing valve may be stuck. Easiest thing to rap the reversing valve with something like a hammer handle to see if becomes on stuck. If that doesn't work it could be the solenoid that reverses the valve that is bad. This happen to me once, only blew warm air.
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Old 09-23-2015, 07:01 PM   #8
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The Fan control on your thermostat controls the fan in the ceiling Air Conditioners. With that said, when the Fan control is set to Low or High, the fan in the Air Conditioners will run even with heat being selected. Set the Fan control to Auto and all will be fine.


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Old 09-23-2015, 09:16 PM   #9
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Quote:
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Front roof ac....
knowing that little tidbit of info earlier would have saved me a lot of typing

OBTW, WELCOME to iRV2.com

We're glad you joined and posted. I'm just hoping you will provide more detailed info with your next question.
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