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Old 07-02-2015, 01:38 PM   #1
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Dash a/c problems

I had posted this earlier under the Class A Motorhome forum but decided "General Discussion" may be the best place so re-posting my thread.

Having problems with my DASH AIR CONDITIONER. It's blowing out hot air. When the engine is running the condenser fan does not come on. Have already re-charged it with refrigerant but did not help. The COMPRESSOR is working fine.
I think it may be a "relay switch" but don't know where this is located. It's a Chevy 454 Chassis. Any ideas? Thank you.
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Old 07-02-2015, 02:03 PM   #2
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The condenser fan is behind the radiator and keeps the engine cool, Do you have a mechanical fan driven by the water-pump belt, they normally have a fluid coupled thermostat clutch device that drives the fan off of the water pump shaft. (Its labeled "Fluid Coupling" in this drawing)

or do you have an electric fan?

You said the compressor is running, so I assume when you select A/C the compressor kicks in.
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Old 07-02-2015, 02:12 PM   #3
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If you're talking about the Evaporator fan (the one inside), does the fan work when you select heater?
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Old 07-03-2015, 10:51 AM   #4
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So compressor is running and inside fan running but hot air.

Electric condenser fan slaves from compressor clutch so double check compressor as the clutch may look like it is turning but not.

Next look at heater control.

Shift to defrost and test with COLD engine.

The defrost runs a on full with heater to place dry air to windshield.

If it blows cold air then that confirms a thought...

The air door inside is in heater position and it is heating the cooled air.
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Old 07-03-2015, 03:42 PM   #5
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Waiter21 & TQ60,
Thanks for your responses.
We have both mechanical & electrical fan. A/C compressor is working and at 25 MPH or more it blows cold air. The Electric condenser fan does not run when engine is turned on and AC is at max setting. Is there maybe a "relay switch" that I should be looking for? If so where is that located? What gives the AC condenser fan power? Thanks for any additional info you can provide
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Old 07-03-2015, 07:37 PM   #6
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I don't know your systems, but I would give an intelligent guess and say the electric fan could be wired so it runs anytime the A/C is on, I would also guess that it is powered through a relay.

I'd start by hooking a voltmeter up to the fan and see if its getting voltage when the A/C is running. i.e. is it a bad fan, or its not getting power.

If no power, you may be able to trace the wires back to see where they go.
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Old 07-03-2015, 09:38 PM   #7
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Check the fan wiring as it can be bad.

Usually fan is connected to same source as clutch.

Could be bad plug or worn wire or ???

Get a voltmeter and carefully check voltage at fan.

Here are some helpful tips.

Get some sewing needles and insert them through the wires being careful to only do one wire and not have it touch anything.

Now you can check voltage in the wire without disturbing a connection.

Motors sometimes fail too.
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Old 07-04-2015, 07:56 AM   #8
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Is there a way to know this "condensor" fan isn't actually a thermostatically controlled radiator fan booster? One that comes on to help cool the radiator during severe conditions?
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