Dash A/C all new but not cooling - Help

[kustom]

hi had everything replaced new compreser / dryer / conderser / expansen
valve / new lines /o rings dash part cleaned flushed and tested shop charged
the freon and nothing hot air even bypassed heater thinking that might be it
still nothing whats up close to $ 2000 spend help

[mel s]

Originally Posted by kustom

hi had everything replaced new compreser / dryer / condenser / expansion valve / new lines /o rings dash part cleaned flushed and tested shop charged the freon and nothing hot air even bypassed heater thinking that might be it still nothing whats up close to $2000 spend help

kustom
Me thinks you should find another shop.
Mel
'96 Safari

[Spk64]

Something is not right there. In this case have to agree with Mel. Need to find a shop that can determine real problem versus just replacing parts.

On a better note for me. I just wrapped up repairing my dash AC this morning. Replaced expansion valve and dryer. Charged with the exact amount of R-134A mfgr recommended (3.5 lbs). And now have normal gauge readings and 47degree temps at dash with 90 degree ambient.


Steve

[kustom]

ok first my dash a/c never worked and we wanted to have cold a/c for
a long trip we were planing it was my call to replace everything to
have a new a/c unit . the shop put in 2 lbs of r 134 maybe i need
more r 134 ?

[jacwjames]

What kind of coach/RV do you have. Make sure the low pressure switch is connected and that electric switch for the compressor is connected.

Did you notice whether the compressor tried to kick in or not? If you didn't put enough Freon in the compressor will not come on.

[deandec]

Take it back to the shop. They should not have collected your $2k without testing the result for success.

Did the AC work for you when you picked up the rig from the shop?

And they should know what volume the system requires for 134a. (Usually there is a label in the engine compartment that specifies the volume of 134a.)

[Spk64]

R-134A systems perform best with the mfgr. specified amount. They say within 2ounces. Just guessing on the amount would not work out that well in my opinion. As others stated there should be a tag showing the exact amount.


Steve

["007"]

Maybe you need to read this post if you have the Evans cooling heat system.

[harleyjt]

Should be label somewhere in engine compartment, usually on the A/C housing showing capacity. If not, go online and find it. That's what I had to do recently to recharge mine. Mine was the typical Evans unit. They have a website. As for the no cooling, does the compressor even engage? If not, look for a faulty switch or sensor. You haven't told us anything about the MH - make, year etc. Hard to even make guesses without knowing more specifics. Don't just add more refrigerant. I'm with a couple of others here - you need to find a different shop. I can't believe you paid them $2000 and the A/C still doesn't work? And they apparently don't have a clue?
jt

[Deny]

you did not say new evaporator, that is about only part left. But O-rings and fittings have to be installed right too. Sounds like you might not have the right technician.

I had a new central unit put in my house a few years back- I finally had to call another serviceman to come out & fix my brand new unit the installer could not make work.

[kustom]

my evaporator was cleaned and tested by a/c shop and was good
most of the cost were parts as a friend installed them for me when it
went to a/c shop all new parts had there plastic plugs the shop installed
the hoses o rings and dryer and said he put 2 lbs or r134 in called and said pick it up he was closing in 10 min.s and we had to leave the next day
charged us $ 275 then said that a rv is to big to cool and drove off we got in
zero cool just hot air we tryed by passing the heater core but no luck
ga. was 105 and fl. was going to be hoter we left and drove allmost all
night to try and beet the heat
yes i need a new shop motorhome is near lake wales fl. anyone known
a shop in that area ?
thanks

[firedoc]

Everyone just casts off 'make sure compressor is running' like its nothing. I know how to look at the AC under the hood of a car and see if the compressor is engaging but how do I do that on a DP. Doesn't seem like it would be so easy!


Sent from my iPhone using iRV2 - RV Forum

[deandec]

Originally Posted by firedoc

Everyone just casts off 'make sure compressor is running' like its nothing. I know how to look at the AC under the hood of a car and see if the compressor is engaging but how do I do that on a DP. Doesn't seem like it would be so easy!
Sent from my iPhone using iRV2 - RV Forum

I stand at the back of my DP, with an C8.3L Cummins, with the Dash AC controls turned off and the engine running at idle.

I note that the compressor pully is spinning madly driven by the compressor belt.

I also note that the Compressor Clutch, the center end piece of the Compressor, is not spinning with the rest of the compressor pully.

I walk to the front of my rig and engage the Dash AC.

I walk back to the engine and the compressor and note that the center end piece of the Compressor (the Clutch) is now spinning.

I conclude that the electrical path from my AC controls to the AC Compressor Clutch is good and that the Clutch is working as designed.

[deandec]

Originally Posted by Spk64

Something is not right there. In this case have to agree with Mel. Need to find a shop that can determine real problem versus just replacing parts.

On a better note for me. I just wrapped up repairing my dash AC this morning. Replaced expansion valve and dryer. Charged with the exact amount of R-134A mfgr recommended (3.5 lbs). And now have normal gauge readings and 47degree temps at dash with 90 degree ambient.


Steve

Yes just had a clogged expansion valve and low pressure line. Back operational now with two new expansion valves, two new dryers, and 5 lbs of 134a plus 8 oz of Pag46. Cool