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Old 07-02-2015, 11:34 AM   #1
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Dash a/c blowing hot air

Having problems with my DASH AIR CONDITIONER. It is not blowing out cold air. When the engine is running the condenser fan does not come on. Already re-charged it with refrigerant and still no help.
Looking for suggestions of what to do next. Thank you.
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Old 07-02-2015, 11:39 AM   #2
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When the engine is running, does the clutch on the AC compressor move? If it does not move, your compressor may be bad. Try to rotate the clutch on the AC compressor by hand (with engine off, of course!). If you can't move the clutch by hand, you have a frozen compressor, and need to replace it. Make sure you have an outfit that knows how to properly evacuate and flush the system--if not you'll end up having to redo it later.
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Old 07-02-2015, 11:51 AM   #3
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Quote:
Originally Posted by Peralko View Post
When the engine is running, does the clutch on the AC compressor move? If it does not move, your compressor may be bad. .....

Even if it does move, it may be worn out. The actual clutch plates wear out over time.

The good news is that if it's only worn out, you only need to replace the clutch mechanism, and not the entire compressor assembly.

The bad news is that many shops will not want to only replace the clutch mechanism, (they will never divulge this money-saving fact to you during the diagnosis), and will insist that you NEED a new compressor, (so they can charge you more hourly labor). And, if they can talk you into a new compressor, you are going to need a new dryer, because the system is open....etc..

An easy $200 repair quickly becomes a $3,000 money-making job!
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Old 07-02-2015, 12:06 PM   #4
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Peralko & Beach Dude :
Just to clarify...The fan motor is good. When I have the engine running & dash A/C turned on Max, the CONDENSOR fan does not move. Hot air blowing out of dash vents. I thought it may be a "relay switch" but don't know where it is so I can check it.
Could you tell me where it's located. Thank you
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Old 07-03-2015, 08:09 AM   #5
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For specific help like you're asking for (the location of a relay), you might want to share the make/model/year of your project? Even with that info you'll be very lucky to find somebody that might be able to help.

Unless you know the motor is good somehow, the motor itself could be your issue as well? I would suggest you consider checking for power at the fan motor and assuming you find nothing there, work your way back up the wire (checking for power at each connection you come across) to find it's power source. No fun for sure, but guaranteed to track your problem down. Make sure you check the motor's ground connection as well.
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Old 07-03-2015, 10:27 AM   #6
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Let's start over...

The condenser fan is either the engine driven fan and or additional electric ones under the hood behind the condenser that usually is mounted in front of the radiator.

The inside fan pulls air from evaporator and is what was called the heater fan back in the day.

Room air fan or evaporator fan or whatever depending on person or trade.

So is no inside air fan then it is usually the fuse.

Next would be connection at fan motor or the motor and maybe switch or resistor block.

Please re verify what is working (compressor or condenser fan etc) and what is not if you need additional help.

We are assuming inside air fan so look for and check fuses then look for the blower fan and check voltages then report what you find if you need more help.
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Old 07-03-2015, 12:55 PM   #7
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Tony, if this is like the one on our coach, the condenser is under the coach, just forward of the front axle, hung at something like a 45 degree angle pointing down and forward - with it's own fan, mounted ahead of the condenser.
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