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Chassis A/C - Printable Version +- Wanderlodge Gurus - The Member Funded Wanderlodge Forum (http://www.wanderlodgegurus.com) +-- Forum: Yahoo Groups Archive (/forumdisplay.php?fid=61) +--- Forum: WanderlodgeForum (/forumdisplay.php?fid=63) +--- Thread: Chassis A/C (/showthread.php?tid=1219) Pages: 1 2 |
Chassis A/C - randydupree2000 - 03-04-2006 14:04 ---ok,so now get a test light and check to see if you have power to the low pressure switch,if so,and the power is not going through the switch you have either a bad switch,or no freon in the system. randy In WanderlodgeForum@yahoogroups.com, David Brady wrote: > > Thanks for the suggestion Randy, but no go on the wiggle. > I'll be visition Josam's in Orlando on Monday, maybe they > can have a look at it. > > David > '02 LXi, Smokey, Va > > randydupree wrote: > > >if you wiggle the wires on the low pressure switch on the compressor does it > >make it work? i have to do this alot on the GM cars we have. with the ac > >turned on,engine running,wiggle the wires on the comp. and on the hoses.. > >randy > >----- Original Message ----- > >From: "David Brady" > >To: > >Sent: Saturday, March 04, 2006 2:56 PM > >Subject: Re: [Wanderlodge_all] Re: Chassis A/C > > > > > > > > > >>Before an after a 100 mile drive I checked to see if the compressor > >>was clutching-up and it wasn't. Does anyone know what kind of > >>circuit breakers or fuses are in the compressor control path? a > >>schematic would be very useful. I have a decent set of tools with > >>me so any suggestions for diagnosing are greatly appreciated. > >> > >>Thanks again, > >>David Brady > >>'02 LXi, Smokey, Va > >> > >>Gregory OConnor wrote: > >> > >> > >> > >>>David, does the engine fan clutch up? did you try this with the > >>>engine running and warm and the interior thermostat set lower than > >>>interior temp? some systems will not clutch up during startup of the > >>>vehicle. I have a 92 cummings M14 in a truck that stores codes for > >>>the ac functions. Having the computer read reveals volumns. > >>>Greg--- In Wanderlodge_all@yahoogroups.com, David Brady > >>>wrote: > >>> > >>> > >>> > >>> > >>>>Folks, > >>>> > >>>>My chassis air conditioning isn't working. I haven't > >>>>found any blown fuses or circuit breakers. The control > >>>>switch wiring looks okay. If I turn on the key and toggle > >>>>the dash ac switch I don't see any voltage changes on the > >>>>wires going to the compressor (in the engine compartment), > >>>>nor do I hear any relay chatter. The compressor doesn't > >>>>seem to be engaging. Any ideas on what I can check? > >>>> > >>>>Thanks, > >>>>David Brady > >>>>'02 LXi, Smokey, Va > >>>> > >>>> > >>>>-- > >>>>No virus found in this outgoing message. > >>>>Checked by AVG Free Edition. > >>>>Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: > >>>> > >>>> > >>>> > >>>> > >>>3/1/2006 > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>>Yahoo! Groups Links > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >>-- > >>No virus found in this outgoing message. > >>Checked by AVG Free Edition. > >>Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 3/3/2006 > >> > >> > >> > >> > >>Yahoo! Groups Links > >> > >> > >> > >> > >> > >> > >> > >> > >> > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 3/3/2006 > Chassis A/C - David Brady - 03-04-2006 14:27 Thanks Randy, I'll try that in the morning. I could use a lesson on the theory of operation. You mention the low pressure switch. Without getting into the heat pump stuff of compressing gas and letting it expand at a lower pressure and consequently creating a cooling effect, which I basically understand, what's in the control path that makes this system work? What does the low pressure switch do? Are there other sensors/switches? AFAIK, the system does not use a thermostat; ie, it's either on or off. I guess she compresses until the low pressure switch turns her off and then when low pressure is hit again, the compressor engages. There may be some hysteresis in here too. So when I press the blue a/c switch on the dash, what does that do? Thanks, David Brady '02 LXi, Smokey, Va randydupree2000 wrote: >---ok,so now get a test light and check to see if you have power to >the low pressure switch,if so,and the power is not going through the >switch you have either a bad switch,or no freon in the system. >randy In WanderlodgeForum@yahoogroups.com, David Brady >wrote: > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 3/3/2006 Chassis A/C - putneyflash@... - 03-04-2006 15:13 you can jump across the contacts for the switch if compressor comes on ok, but that doesn/t mean the switch is bad if you lose freon the low pressure switch shiuts off the compressor, -------------- Original message from David Brady -------------- Thanks Randy, I'll try that in the morning. I could use a lesson on the theory of operation. You mention the low pressure switch. Without getting into the heat pump stuff of compressing gas and letting it expand at a lower pressure and consequently creating a cooling effect, which I basically understand, what's in the control path that makes this system work? What does the low pressure switch do? Are there other sensors/switches? AFAIK, the system does not use a thermostat; ie, it's either on or off. I guess she compresses until the low pressure switch turns her off and then when low pressure is hit again, the compressor engages. There may be some hysteresis in here too. So when I press the blue a/c switch on the dash, what does that do? Thanks, David Brady '02 LXi, Smokey, Va randydupree2000 wrote: >---ok,so now get a test light and check to see if you have power to >the low pressure switch,if so,and the power is not going through the >switch you have either a bad switch,or no freon in the system. >randy In WanderlodgeForum@yahoogroups.com, David Brady >wrote: > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 3/3/2006 SPONSORED LINKS Recreational vehicles Wanderlodge Automotive maintenance Recreational vehicle dealer Used recreational vehicles Automotive radiators YAHOO! GROUPS LINKS Visit your group "WanderlodgeForum" on the web. To unsubscribe from this group, send an email to: WanderlodgeForum-unsubscribe@yahoogroups.com Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. [Non-text portions of this message have been removed] Chassis A/C - Gregory OConnor - 03-04-2006 16:33 Randy, does the engine fan kick on when you ask for AC at the dash or does the Low Pressure Switch turn the fan on ? Greg --- In WanderlodgeForum@yahoogroups.com, "randydupree2000" > > ---ok,so now get a test light and check to see if you have power to > the low pressure switch,if so,and the power is not going through the > switch you have either a bad switch,or no freon in the system. > randy In WanderlodgeForum@yahoogroups.com, David Brady > wrote: > > > > Thanks for the suggestion Randy, but no go on the wiggle. > > I'll be visition Josam's in Orlando on Monday, maybe they > > can have a look at it. > > > > David > > '02 LXi, Smokey, Va > > > > randydupree wrote: > > > > >if you wiggle the wires on the low pressure switch on the > compressor does it > > >make it work? i have to do this alot on the GM cars we have. with > the ac > > >turned on,engine running,wiggle the wires on the comp. and on the > hoses.. > > >randy > > >----- Original Message ----- > > >From: "David Brady" > > >To: > > >Sent: Saturday, March 04, 2006 2:56 PM > > >Subject: Re: [Wanderlodge_all] Re: Chassis A/C > > > > > > > > > > > > > > >>Before an after a 100 mile drive I checked to see if the > compressor > > >>was clutching-up and it wasn't. Does anyone know what kind of > > >>circuit breakers or fuses are in the compressor control path? a > > >>schematic would be very useful. I have a decent set of tools with > > >>me so any suggestions for diagnosing are greatly appreciated. > > >> > > >>Thanks again, > > >>David Brady > > >>'02 LXi, Smokey, Va > > >> > > >>Gregory OConnor wrote: > > >> > > >> > > >> > > >>>David, does the engine fan clutch up? did you try this with the > > >>>engine running and warm and the interior thermostat set lower > than > > >>>interior temp? some systems will not clutch up during startup > of the > > >>>vehicle. I have a 92 cummings M14 in a truck that stores > codes for > > >>>the ac functions. Having the computer read reveals volumns. > > >>>Greg--- In Wanderlodge_all@yahoogroups.com, David Brady > > > >>>wrote: > > >>> > > >>> > > >>> > > >>> > > >>>>Folks, > > >>>> > > >>>>My chassis air conditioning isn't working. I haven't > > >>>>found any blown fuses or circuit breakers. The control > > >>>>switch wiring looks okay. If I turn on the key and toggle > > >>>>the dash ac switch I don't see any voltage changes on the > > >>>>wires going to the compressor (in the engine compartment), > > >>>>nor do I hear any relay chatter. The compressor doesn't > > >>>>seem to be engaging. Any ideas on what I can check? > > >>>> > > >>>>Thanks, > > >>>>David Brady > > >>>>'02 LXi, Smokey, Va > > >>>> > > >>>> > > >>>>-- > > >>>>No virus found in this outgoing message. > > >>>>Checked by AVG Free Edition. > > >>>>Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: > > >>>> > > >>>> > > >>>> > > >>>> > > >>>3/1/2006 > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>>Yahoo! Groups Links > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >>> > > >> > > >>-- > > >>No virus found in this outgoing message. > > >>Checked by AVG Free Edition. > > >>Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: > 3/3/2006 > > >> > > >> > > >> > > >> > > >>Yahoo! Groups Links > > >> > > >> > > >> > > >> > > >> > > >> > > >> > > >> > > >> > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > No virus found in this outgoing message. > > Checked by AVG Free Edition. > > Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: > 3/3/2006 > > > Chassis A/C - David Brady - 03-05-2006 15:18 Hi George, Thanks for your help. I tried your diagnostics and found that the clutch internal resistance is good, but the 12v supply from the harness is non-existent. I may have a fuse or circuit breaker issue, but I can't find a fuse/circuit breaker at any of my load centers that's labeled anything close to chassis a/c. Ralph, I looked in the outside compartment next to the pilot seat, but there are no fuses there for the chassis a/c that I can tell. Any help in finding fuses is greatly appreciated. Thanks, David Brady '02 LXi, Smokey, Va George Lowry wrote: >David, > >Had a similar problem with our '95 bird. At the compressor, you should >find a wire that goes to the clutch. Mine had a connector that I could >unplug, If it is a butt connector, just cut the wire. Two checks. >First; with the key in the on position and the A/C controls set for >cooling, check the wire end that comes from the harness for 12 volts. >If you are not getting 12 volts, you probably have a blown fuse or >other similar problem. Second; using an ohm meter, check the wire >going to the clutch for continuity. The clutch is internally grounded >so you should get a very low resistance reading. If it shows infinite >resistance, the clutch coil is open and needs to be replaced. A >confirming test is to use a jumper wire and connect 12 volts to the >wire to the clutch. If the clutch is ok, it will pull in. That will >give you a starting point. > >George Lowry >'06 Alpine Apex - Formerly '95 Wbda 4203 >Spearfish, SD Now in Gila Bend, AZ > >David Brady wrote: > > > > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.2/274 - Release Date: 3/3/2006 |