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toolster · 10-23-2017, 05:25 PM

My dash air works intermittently, it will blow warm then we hit a pothole and the AC comes on. My first thought was the blender door was loose, but the AC clutch is not activating so I looked for a loose wire and came up with nothing. so my question is what switch activates the AC clutch ?
What trouble shooting can I do ?
Any help/suggestions are more than welcome.

8.3Oilbuner · 10-23-2017, 06:00 PM

HI Toolster; You definably have a lose connection since the dash air will blow cold. I am just going to guess here but have you tried looking at the switch on the high pressure side of the A/C line. This switch is designed to shut down the A/C system if there is not enough Freon in the system. It has two wires attached to the switch. Open your generator compartment and find the high A/C pressure line. The switch should be on that line. I am going by memory here so I am almost sure it is on that line. Also there is fuse in the system for the A/C clutch. I would look there also. The fuse might be in the electrical bay under the drives seat on the outside under the drivers window. I believe that is where mine is on my 01 Windsor. Just a few suggestions to get you going. I also think on the Ambassador that your A/C condenser Is located behind the drivers rear wheels in a compartment. A door that swings open with the condenser and a electric fan. When the system is turned on, you should here that fan engage along with the A/C clutch. This is how the system worked on my brother in laws 03 Neptune, so yours could be different. Let us know how hunt goes. Good luck!

toolster · 10-24-2017, 10:04 AM

found the switch on the high pressure line, checked connections all ok. should there be voltage to this switch ? also appears the switch is closed. Checked fuses all good.
if there should be voltage to this switch where would that come from ?

8.3Oilbuner · 10-25-2017, 11:41 AM

Good afternoon Toolster; Sorry to take so long to reply. Without a wiring diagram, I would not know if there is supposed to be power to the pressure switch. If the switch is in the closed position that is good. It means that there is enough Freon in the system to keep it from opening and not completing the circuit. I am going to guess here, but I think that part of the circuit would be on the ground side. Again only guessing. Here is a procedure I have done in the past to check the high pressure switch when I did not have a volt or ohm meter handy. You can use a jumper on the two wires to the high pressure switch which bypasses the switch. Since you say the system cools after a jolt, I would put a jumper on the switch, start the coach and turn the dash A/C on and put the blower on high. If still you get no clutch engagement on the compressor and the fuse is good as you say, next I would want to check out the wire that goes to the A/C clutch. If you have power there, which I am guessing you will not, I would investigate the dash A/C switch. It might be making an interment connection. Lots of places to look, one at a time. I hope this gives you some more places to look and get this problem solved. Best of luck!

K7JV · 10-25-2017, 09:11 PM

I don't know how much your coach would be like our '06 Dynasty when it comes to A/C, but it very well might be quite similar. I am attaching a drawing that Monaco says applies to the Dynasty, Executive, Imperial and Patriot, but there should be some commonality to at least some of the devices and interconnections. I hope you can get some good out of it.

Good luck in your efforts.

66gt350 · 10-26-2017, 06:00 AM

I would check for voltage at the compressor when you have the A/C on and the clutch is not engaged. If you have 12 volts there you will eliminate a lot of testing. You may just have a weak clutch coil.

Jim

toolster · 11-01-2017, 06:18 AM

Thanks to all for your suggestions, haven't found a way to get to the compressor yet, looks like I will have to take down the stone guard under the motor and try getting access that way to test the voltage. Temps here in Maine are dropping so it
may need to be left for the spring or farmed out if I can find somebody who will work on it.

nehog · 11-01-2017, 05:29 PM

Quote:

Originally Posted by toolster

Thanks to all for your suggestions, haven't found a way to get to the compressor yet, looks like I will have to take down the stone guard under the motor and try getting access that way to test the voltage. Temps here in Maine are dropping so it
may need to be left for the spring or farmed out if I can find somebody who will work on it.

I think the best access is from above through the hatch... There isn't a lot of space from below to get at the AC compressor (which is at the top of the engine above the alternator).

The diagram from K7JV's post is probably almost exactly what we have in our Ambassadors too.