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Old 05-01-2013, 12:57 PM   #1
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Join Date: Jun 2012
Location: Austin, Tx
Posts: 31
Intermittent dash air conditioner

Periodically our dash a/c just blows forced air - not refrigerated. Most often, if I turn off the a/c and the engine then restart both, the a/c works fine. Not today- even after a hard re-start. What am I missing? Would appreciate input from any of you that have had this issue and corrected it.

2006 CC Inspire 360 #51534

'06, 36' CC Inspire 360 #51534
Cat C9
'11 Wrangler Unlimited
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Old 05-01-2013, 01:21 PM   #2
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Join Date: Jun 2012
Location: Austin, Tx
Posts: 31
Additional information: this new inability to "reset" the a/c and get refrigerated air began right after I had the radiator coolant flushd and had the engine thermostats replaced. Might it be related to the thermostat replacements?

'06, 36' CC Inspire 360 #51534
Cat C9
'11 Wrangler Unlimited
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Old 05-01-2013, 06:55 PM   #3
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Location: Sacramento Area
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I would doubt your lack of dash air relates to the cooling system service.

Since you have no cool air now, do you have a fan blowing warm air or no fan at all. If no fan, check your fan fuse.

Look at the compressor. Is the clutch on its front turning with the compressor pully. If so, then the Compressor and clutch are ok.

If not turning, the compressor clutch might be bad.

If compressor not spinning, check the chassis fuse panel for blown AC compressor fuse.

If the above check ok, perhaps your temp control wire is failing and the heater vent shut down did not close properly. Open the dash by the heater and check for proper control operation.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 05-01-2013, 07:19 PM   #4
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Location: Cincinnati
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If your compressor is stopping, it could be a bad relay or wire to the clutch. Also need to check pressures in the system to see if an under pressure switch is shutting down or over pressure causing compressor to stall. Many places to check, might save time and money going to a shop that has the right tools and gauges.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-08-2013, 06:52 AM   #5
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three times in the shop, three new compressors, finally found b-bs from system got loose and caused the problem, Believe they were from the dryer system. Last compressor was ok as was probably the previous one. 1997 Monaco dynasty.
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Old 05-09-2013, 08:25 PM   #6
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Since you stated it blows uncooled air I will assume the fan control and fan are fine.

Questions to answer first, if "no" seek help.

Do you have a volt meter and know how to use it?

Can you access your engine area to check voltages?

Do you understand basic troubleshooting and wire tracing?

Check your wiring diagram that should be in your manual set, if you do not have one, maybe you can get one from another member or CC.

Make a copy so you can mark on the copy, will help you troubleshoot.

Locate the compressor and circle it.

Follow the wire back towards the control system, circle anything it touches, expect to find relays and safety switches, maybe a fuse.

Now that that is done, go to the coach and look for these items, starting at the control or the clutch, measure the voltages, turn the ign on and AC on full, do not start the engine yet.

Locate the clutch on the compressor, see if the wire has a good connection, measure this voltage while you are there, have your helper turn the switch on and off to see if it clicks in or the voltage changes.

Take notes on your copy, locations of the devices, colors of wires or any other details that would be handy later.

There will be a low pressure safety switch that will prevent the clutch from engaging with low pressure, but it will allow 12 volts to the clutch with the engine not running.

THere could be a control system that prevents this, but if you start at the dash switch to confirm the voltage is leaving there then that is the starting point.

THere are many connectors in the wiring system, one of them could be bad, or low coolant in the system.

Work toward the clutch confirming voltage readings, when you find a connector carefully check voltage on each side without wiggling as this may fix it for now.

If you get to the dryer where the pressure switch is usually located and discover the voltage stops there you may have low coolant and need it charged, if you have voltage on both sides then check the clutch.

This should give you the guidance to start, take your time and be carefull, avoid messing with any connection until you measure it first, often they get intermittent and will drive you crazy, a simple bumping of the connector may fix it for now only for it to fail later, measuring first to see the connection bad insures that you know there is a problem and you can then open the connection and clean the pins and connect it back and confirm it works, takes longer but the repairs are more sound.

Good luck and post your findings as you go!
Tony & Lori
1989 Country Coach Savannah SE
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Old 05-22-2013, 09:30 AM   #7
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Location: Austin, Tx
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Problem solved. Seems that when we had the radiator flushed and the thermostats replaced, the tech left the a/c compressor's power wire unplugged. It just so happens that the compressor wire runs just above one of the thermostats' housings. Found the errant wires, plugged them to each other and cold air aplenty now! Thanks to all for your help and suggestions with this one.

'06, 36' CC Inspire 360 #51534
Cat C9
'11 Wrangler Unlimited
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