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Topic: trouble shooting a 1998 U270 FT A/C (Read 1286 times) previous topic - next topic

Re: trouble shooting a 1998 U270 FT A/C

Reply #25 –
IS there a valve between the front Dash and the back compressor. I had my friend Vacuum the refrigerant out and replace the freon with oil to the proper poundage in. He said it would only take a partial fill like something was plugged.. so is there a check valve or something that might be plugged between the front and back?

2002 u320

Re: trouble shooting a 1998 U270 FT A/C

Reply #26 –
Would my 1998 U270 C8.3 be a Ford HAVC? Because if indeed it is; the compressor is a GM. Would that make a difference? The original compressor acted the same way as the current situation. So it was probably good one that Bern'd replaced. I hate throwing parts at the beast.
John
1998 U270 34'

Re: trouble shooting a 1998 U270 FT A/C

Reply #27 –
Quote from: DavidS –
IS there a valve between the front Dash and the back compressor. I had my friend Vacuum the refrigerant out and replace the freon with oil to the proper poundage in. He said it would only take a partial fill like something was plugged.. so is there a check valve or something that might be plugged between the front and back?

2002 u320
There is the expansion valve at the evap. coil, but it is controlled by the thermostat. If he added the more than a small amount of oil you now have too much. I don't understand why it would only take a partial fill,, was he going by pressures?
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #28 –
Quote from: John/Pat –
Would my 1998 U270 C8.3 be a Ford HAVC? Because if indeed it is; the compressor is a GM. Would that make a difference? The original compressor acted the same way as the current situation. So it was probably good one that Bern'd replaced. I hate throwing parts at the beast.
When I called FT to get the manufacturer of the dash system, it was an independent company on my '99 I am sure it is the same on most FT's The compressor I have is used on automobiles and is the number that Fortravel uses. The compressor doesn't need to know what system it is working on to function. Pressure checking tells you if the compressor is good. Bad compressors have too low a pressure on the high side. Bad expansion valves having  too high a pressure on the high side while have too low a pressure on the low side.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #29 –
John has you system been converted from R12 to 134a freeon? If so the hoses may be the culprit,  134a has a smaller molecular structure and will permeate through the hose very slowly. We converted some of or older equipment and found that the hoses where the problem among other things.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: trouble shooting a 1998 U270 FT A/C

Reply #30 –
Quote from: bbeane –
John has you system been converted from R12 to 134a freeon? If so the hoses may be the culprit,  134a has a smaller molecular structure and will permeate through the hose very slowly. We converted some of or older equipment and found that the hoses where the problem among other things.
1998 would be 134a from the factory.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #31 –
Quote from: craneman –
There is the expansion valve at the evap. coil, but it is controlled by the thermostat. If he added the more than a small amount of oil you now have too much. I don't understand why it would only take a partial fill,, was he going by pressures?
Yes he went by the pressure and it just rose to much per Foretravels poundage( he didnt get close to having the limit in yet) ..

possibly the valve then.. I will check it and go from there .. thanks that helps me.

Re: trouble shooting a 1998 U270 FT A/C

Reply #32 –
Quote from: DavidS –
Yes he went by the pressure and it just rose to much per Foretravels poundage( he didnt get close to having the limit in yet) ..

possibly the valve then.. I will check it and go from there .. thanks that helps me.
Before you go there, find and fix the leaks, then charge until you get abut 20 psi on the low side and ignore the lbs. you are putting in. Put a thermometer in the register and add Freon until you get the lowest temperature. Temp. and pressure are related lower low side pressure equals colder temp. That is what I have done and it works great. You might not have a bad expansion valve after all.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #33 –
What manufacturer did FT use for 1998 U270? Comfort Air, Acme, or Denso?
John
1998 U270 34'

Re: trouble shooting a 1998 U270 FT A/C

Reply #34 –
I had called Mike at parts to get the info on mine. Don't know who you would ask about yours. Mine is no longer made but some parts were available. Don (Accousticart) had problems getting the right evap. coil I believe.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #35 –
My problem was getting the right heater core, the original evaporator is still there and still works... fingers crossed! I would probably have lived with non-working dash A/C (for awhile), but the heater core is (in my mind at least) a bigger issue. Of course for the most effective defrosting, having both work is optimal.
Don
Quote from: craneman –
I had called Mike at parts to get the info on mine. Don't know who you would ask about yours. Mine is no longer made but some parts were available. Don (Accousticart) had problems getting the right evap. coil I believe.
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Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: trouble shooting a 1998 U270 FT A/C

Reply #36 –
I must be getting "old timers disease" At least I was in the right area.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: trouble shooting a 1998 U270 FT A/C

Reply #37 –
Radiator shops typically repair heater cores also. Expansion valves of a 1000 different varieties are available from sporlan.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: trouble shooting a 1998 U270 FT A/C

Reply #40 –
I think I need to go into the dash A/C repair business. Come visit me, cash only. No written guarantee, but I'll get it working LOL.

Most of the clowns working on these systems don't truly understand the theory of operation. With a TXV, the charge % allows some flexibility. Find my comments/threads where I changed out TXV and fixed my system after blowing a high pressure line.
1998 U270 34'

Re: trouble shooting a 1998 U270 FT A/C

Reply #41 –
Quote from: krush –
I think I need to go into the dash A/C repair business. Come visit me, cash only. No written guarantee, but I'll get it working LOL.

Most of the clowns working on these systems don't truly understand the theory of operation. With a TXV, the charge % allows some flexibility. Find my comments/threads where I changed out TXV and fixed my system after blowing a high pressure line.
Scary clowns at best may well descride the push towards modern, hip, Google freak searchers, and younger workforce, who have no desire to actually learn and apply theory or basic troubleshooting. They generate twice the billable hours so it's a Win, Win situation. Oh BTW our estimates on repairs may well go over 300% with shop fees, disposal fees, and accounting fees, plus a surcharge for paying cash.

Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: trouble shooting a 1998 U270 FT A/C

Reply #42 –
I understand,my point being in trying to find the leak it would be alot cheaper getting a good ma and pa shop with a leak
detector than a shop charging double what pa charges with the same leak detector.
96 U270 BUILD 4810
85 380SL
Drummonds TN.
 

Re: trouble shooting a 1998 U270 FT A/C

Reply #43 –
Willy White helped me get my dash AC up and running.. special thanks to him. Very nice guy and very patient.

Tracked the problem to a leak at the high pressure switch.. O ring fixed it and a short in the condenser fan.. he soldered the connection on the plug and we were up and running.

Awesome guy and thanks again for the help.