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Old 08-14-2019, 10:16 PM   #1
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Dash A/C condenser fan relay location

Good evening!

2008 Dip. Does anyone know where Iíd find the condenser fan relay.
Dash A/C was working fine and then became intermittent and now I cannot get the compressor or condenser fan to come on at all. When it was intermittent, the compressor would cycle in and out but never long enough to cause a freeze up condition.

Any help would be much appreciated.
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Old 08-15-2019, 06:23 AM   #2
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Quote:
Originally Posted by Doug.terri5 View Post
Good evening!

2008 Dip. Does anyone know where Iíd find the condenser fan relay.
Dash A/C was working fine and then became intermittent and now I cannot get the compressor or condenser fan to come on at all. When it was intermittent, the compressor would cycle in and out but never long enough to cause a freeze up condition.

Any help would be much appreciated.

If you have access to a wiring diagram it could be very telling in more ways than one. If so? perhaps share.

Happy Trails
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Old 08-15-2019, 07:42 AM   #3
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I need some education, here. Isn't the condenser in the "stack" of heat exchangers on the side (hopefully) or the rear of the coach? The fan should be the same hydraulic fan that cools the engine coolant, the transmission coolant and the intake charge air, isn't it? The only relay involved in our '06 Dynasty's dash A/C system is the clutch for the compressor.

I just posted the schematic for our dash HVAC system a couple of posts down, a few minutes ago, but I'll post it again, here, in case it might be helpful.
Attached Files
File Type: pdf Schematic - Dash HVAC Control.pdf (291.5 KB, 10 views)
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Old 08-15-2019, 11:13 AM   #4
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Doug,(?)
Probably nothing to do w\"condenser fan relay", but more to do w\low Freon charge, every mobile ac system built the last 40yrs has a pressure switch of some kind that shuts power feed to compressor down\off when freon pressure is low, (exactly what you're describing) & located in the low pressure side of system,(this switch is usually screwed into an accumulator) , to prevent compressor damage or freezeup. As these are considered\called "sealed systems" this usually means a leak somewhere. If your comfortable with\& can find the access ports, (5\16" schrader valves, 1 for hi pressure, 1 for low pressure, & used for gauges hookup), you could pu a "recharge kit" from Walmart, etc & put a partial charge in the system & see if the ac comes back on.
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Old 08-15-2019, 11:53 AM   #5
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Rick and Jim,

My A/C condenser is actually on the driver's side of the coach in the back behind the axle and a vented door that can be opened. It is not in the stack at the rear of the coach.

Rick, when this issue started we were in Texas and I had a shop put gauges on it and he did add a little freon but said that was not my issue. He just worked me in and didn't have time to take it any further as I was just passing through. We did however check the low pressure switch.

This is what made me think it might be electrical. I'll check all the connections to the compressor as well as the fan for the condenser but as of now neither one seems to be coming on at all.

I certainly appreciate your replies!
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Old 08-15-2019, 12:00 PM   #6
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Some coaches actually have a condenser with an elect 12v fan .
I had a 2000 Endeavor ( Monaco made ) with such a set up .
However his Diplomat doesn't have an elect condenser fan
His condenser is in the rear radiator stack and his fan is belt drive .

I agree with Rick he is probably low on refrigerant .

Ray
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Old 08-15-2019, 02:56 PM   #7
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I looked further, and I do indeed have a condenser fan breaker. On the '06 Dynasty, it is located in the rear run box on board #4 and is a 20 amp breaker. I also found a drawing that shows the Condenser Fan Relay. However, the circuit board and connection references on the relay drawing do not match what is on the respective circuit boards on our coach. So if I have this relay, I don't have any documentation that shows it.

This is the first time I've delved into this piece of our coach, so didn't know the drawings were in conflict. At this point, I don't know if I have a condenser fan, or not. I suspect that I do not.

We had a freon leak on our unit, a year ago, and the leak was within the condenser. As a result, we had to have it replaced. On our coach, that was in the "stack" of heat exchangers behind the side radiator grill on the rear, driver's side. In that position, it is served by the hydraulic engine cooling fan. I do have the circuit breaker, however. Strange.
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Old 08-15-2019, 03:22 PM   #8
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Thank you Jim and Ray! I have a rear radiator but I definitely have the 12V fan for the A/C condenser on the rear driver's side of the coach.

I'll look everything over and see if I can locate any breakers or fuses in the run bays.
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Old 08-16-2019, 09:32 PM   #9
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I have a 2008 Knight with rear radiator

A/C wiring should be similar to the Diplomat.

There are definitely fuse/fuses for the A/C in left front drivers run bay Back of cover should give the fuse # and size.

If I remember correctly A/C condenser fan cycles with compressor
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Old 08-16-2019, 10:04 PM   #10
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there are 2 fuses and a A/C relay located in the front distribution box.

one is a 20A clutch fuse

one is a 20A fuse # F13 that runs thru the A/C selector switch on the dash and then thru the thermostat and Trinary switch ( located at the evaporator in the front of the coach ) to signal the the A/C relay to energize
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Old 08-18-2019, 08:09 PM   #11
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Thank you doublechevy! The fuse was found and it is good but Iíll check the temp sensor that goes into the evaporator next.

The system was checked for proper charge just this spring. The shop just didnít have time to take it any further as I just dropped in as I was coming through.

Iíll keep checking and let everyone know what I find.

Doug
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Old 08-19-2019, 02:32 PM   #12
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2008 Endeavor. Rear radiator. Condenser on drivers side.

Had plenty of troubles with mine so mouse over any yellow post it type notes.

Mine has had a slow leak since new. My condenser fan had an intermittent short but I managed to sort that one out.

I will post this and edit as I dig things up.

I built a small jumper to bypass the relay in the front run panel while diagnosing the problems.
Attached Files
File Type: pdf AC Dash Air Conditioner with notes 2.pdf (119.1 KB, 6 views)
File Type: pdf AC Dash Air Conditioner with notes.pdf (118.4 KB, 6 views)
File Type: pdf AC Dash Air.pdf (132.2 KB, 4 views)
File Type: pdf AC Dash system.pdf (132.3 KB, 3 views)
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Old 08-19-2019, 09:33 PM   #13
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Myron,

I canít thank you and everyone else enough for all the help and ideas as well as the files youíve forwarded. I found the problem and it was a bad thermistor in the evaporator in the front genny compartment.

I just jumped around it and all works fine. I see I can order the part on eBay for about $36.00.

Kindest regards,

Doug
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Old 08-20-2019, 12:51 PM   #14
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I didn't look at the schematics again but I remember jumping something up there in order to get the compressor to turn on. Once I got some more freon onboard things worked as they should.

Just saying, if your are low on freon it may be the cause.
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