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Old 06-22-2022, 07:01 PM   #15
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What chassis is your coach built on ?

What dash A/C system did Fleetwood install ? Denso ? Evans? other ?
Itís a Freightliner chassis. Couldnít tell you what AC system is in it. Since the AC worked great until the hose leaked, I just assumed fixing the hose and refilling the 134a would do the trick. But for whatever reason the compressor doesnít want to start.
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Old 06-22-2022, 07:23 PM   #16
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OK , on my 99 Freightliner chassis ; Newmar / Evans dash A/C system ; Newmar attached to the Freightliner A/C compressor clutch wiring , just above the genset .

If Fleetwood did a similar connection and the dash system is delivering power to this point , then you have to investigate Freightliner wiring in the engine compartment .
If there is a connection here and no power to it , then you have to trace backwards toward the A/C control head . In my case there is a relay , that provides power to the A/C condenser fan too . Does your A/C condenser fan run , if the shop didn't power it up at the same time as the compressor ; pressures would be HIGH .

Blue wire is Evans , White is Freightliner .
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Old 06-22-2022, 07:31 PM   #17
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Look around under your hood : Evans systems are easy to identify . Blue oval
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Old 06-22-2022, 07:34 PM   #18
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OK , on my 99 Freightliner chassis ; Newmar / Evans dash A/C system ; Newmar attached to the Freightliner A/C compressor clutch wiring , just above the genset .

If Fleetwood did a similar connection and the dash system is delivering power to this point , then you have to investigate Freightliner wiring in the engine compartment .
If there is a connection here and no power to it , then you have to trace backwards toward the A/C control head . In my case there is a relay , that provides power to the A/C condenser fan too . Does your A/C condenser fan run , if the shop didn't power it up at the same time as the compressor ; pressures would be HIGH .

Blue wire is Evans , White is Freightliner .
Thanks Skip. Iím going to pass this info on to the shop. Much appreciated.
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Old 06-22-2022, 07:41 PM   #19
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Please ask them to try and identify the dash system . I have wiring info for Evans and Denso repair info .

EDIT: Also , 1999 F/L XC Chassis ,wiring schematic if they need it : But not much other that circuit number and wire color ( 97C and white ) beside the connection in the photo.
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Old 06-23-2022, 05:28 AM   #20
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This is what I get, system charged, system green light on meaning to me itís getting power, system blows cold are when power direct to compressor. My opinion pull the 2 wire plug off of low pressure cut off switch and jump it. If compressor kicks on itís either that sensor or low on Freon still.
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Old 06-23-2022, 06:53 AM   #21
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This is what I get, system charged, system green light on meaning to me itís getting power, system blows cold are when power direct to compressor. My opinion pull the 2 wire plug off of low pressure cut off switch and jump it. If compressor kicks on itís either that sensor or low on Freon still.
Thanks, I just forwarded that idea to the shop.
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Old 06-23-2022, 06:56 AM   #22
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The shop couldn't find the low pressure sensor. Any idea where it's at?
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Old 06-23-2022, 09:05 AM   #23
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FYI I have a Denso system.
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Old 06-23-2022, 09:25 AM   #24
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FYI I have a Denso system.
Ok good to know what system you have .

Now to figure out where the pressure switch is .

Mine is in the liquid line next to the receiver dryer ; BUT ; that section of the plumbing maybe part of the Evans dash kit.
To the best of my knowledge , Freightliner installed the A/C lines to the front of the frame rail , including the dryer , then according to this Evans diagram , Newmar installed the rest .

Here's the Denso info I have , I haven't been through it looking for the pressure ( binary ) switch location.
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Old 06-23-2022, 09:36 AM   #25
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In the pdf ; page 40 , diagram 58 , pressure switch appears to be accessed by removing the blower motor assembly . Other diagrams show a wiring connector outside the housing .

Must have been an engineer involved in that placement hiding a part that's likely to fail .
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Old 06-23-2022, 09:37 AM   #26
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Ok good to know what system you have .

Now to figure out where the pressure switch is .

Mine is in the liquid line next to the receiver dryer ; BUT ; that section of the plumbing maybe part of the Evans dash kit.
To the best of my knowledge , Freightliner installed the A/C lines to the front of the frame rail , including the dryer , then according to this Evans diagram , Newmar installed the rest .

Here's the Denso info I have , I haven't been through it looking for the pressure ( binary ) switch location.
Guys on the Discovery group say the pressure switch (high/low combo switch) is located in the heater/AC housing under the dash. Of course getting to it would be a PITA. So at this point I'm about to give up. We only have one trip planned this year (so far) so it doesn't make sense to throw a bunch more money at it. It's just disappointing because it worked so well until the leak occurred.

One other thing I'll mention; when the tech vacuumed out the system he put 3 lbs. of 134a back in it and the system capacity is 3.5 lbs. That extra half lb. wouldn't be enough to prevent the compressor from starting, would it??
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Old 06-23-2022, 09:45 AM   #27
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My Evans system uses the 3.5 # too .
I haven't read the pdf on Denso , end to end , so I'm not sure what the pressure range of the switch is ( or even if it's there ).

But with the wiring connector external to the housing , the shop could add the extra .5# and check to see if the switch closes to activate the clutch .
Pressure should produce continuity in the switch .

EDIT : Should read " Correct pressure".
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Old 06-23-2022, 01:49 PM   #28
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Guys on the Discovery group say the pressure switch (high/low combo switch) is located in the heater/AC housing under the dash. Of course getting to it would be a PITA. So at this point I'm about to give up. We only have one trip planned this year (so far) so it doesn't make sense to throw a bunch more money at it. It's just disappointing because it worked so well until the leak occurred.



One other thing I'll mention; when the tech vacuumed out the system he put 3 lbs. of 134a back in it and the system capacity is 3.5 lbs. That extra half lb. wouldn't be enough to prevent the compressor from starting, would it??


Just a thought tech vacuum out 3 lbs after it had been leaking enough to turn off compressor? So how does tech know that 3.5 is enough?
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