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Old 07-24-2018, 06:05 PM   #1
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Dash AC not cold

I started to charge the system with freon using a AC-Pro unit 134a bought at autozone commonly used on cars. Followed the directions and initial meter reading showed no freon, needle did not move, after putting about a pound of freon still sitting smack on the bottom. Checked the gauge on my CRV and showed charged in the green midway so I know that the AC-Pro gauge is working. Newmar says my dash unit holds 3.5 pounds of freon. So, shouldn't 1 pound move the needle? I stopped putting more in because I don't know if this unit works like a car unit. Should I continue putting more freon in?
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Old 07-24-2018, 06:30 PM   #2
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Unless you also monitor the high pressure, using one of the 'can with a gauge' is really guessing. If the pressure was '0' when you began, what makes you think adding more refrigerant is going to stay in the system? Proper service would be to find the leak, repair it, replace the receiver/dryer, then have a vacuum pulled on the system, wait to see if the vacuum stays, then fill with the proper amount of refrigerant and oil. Either spend the money for proper servicing or spend the money on R-134a cans that will need to be added regularly.
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Old 07-24-2018, 06:53 PM   #3
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Did you check for leaks?
Before you ever started did you check to see if you may have had this problem?
A test with a pair of vice grip pliers on one of the heater hoses may have caused more cool air through your Evan's system.
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Old 07-25-2018, 05:32 AM   #4
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Thanks, the dash air is not warm ,cool, but not cold. Thought could be simple fix, going to Newmar in September let them fix it.
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Old 07-25-2018, 06:40 AM   #5
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Make sure the A/C compressor is running. If the compressor is not pumping the gage will read 0. The compressor should have a safety feature that will not allow it to pump when the gas pressure gets below a certain point. This helps stop the compressor from self destructing. It may take more than one can to get the compressor to begin pumping.
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Old 07-25-2018, 09:55 AM   #6
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If the unit is off you should see some pressure in the system. I don't remember how much but it should be there. If the reading is 0 then it will be empty and should be checked for leaks before adding refrigerant.
Good luck keep us in the loop please.
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Old 07-25-2018, 10:51 AM   #7
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Quincy, I always checked with engine running and AC wide open on. You say check with off and should have pressure?
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Old 07-25-2018, 10:53 AM   #8
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Gary, am I listening for the compressor or can I look for it and see it running? different than a car.
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Old 07-25-2018, 11:05 AM   #9
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Quincy, just checked it with unit off and registered in the red, beyond the green (which means fully charged), but I don't know how a AC-Pro canister relates to this Evans system.
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Old 07-25-2018, 11:07 AM   #10
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Quote:
Originally Posted by wracinti View Post
Gary, am I listening for the compressor or can I look for it and see it running? different than a car.
The A/C system in an RV is very much like a car, just in different locations on the chassis. The compressor pulley center clutch should be turning when the compressor is engaged. If the center isn't spinning, it's not energized.

Following up on '007's point, have you felt both heater hoses running into the plenum to be sure it's fully off? Many poor cooling issues are a result of the heater fighting the A/C.
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Old 07-25-2018, 12:40 PM   #11
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Quote:
Originally Posted by BFlinn181 View Post
The A/C system in an RV is very much like a car, just in different locations on the chassis. The compressor pulley center clutch should be turning when the compressor is engaged. If the center isn't spinning, it's not energized.

Following up on '007's point, have you felt both heater hoses running into the plenum to be sure it's fully off? Many poor cooling issues are a result of the heater fighting the A/C.
All true, if the heater water valve does not close the heater will negate the cooling even if the AC is properly charged and running.

Just like there is pressure in the can of Freon there will be a noticeable pressure in the condenser.

Good luck and keep us posted please.
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Old 07-25-2018, 01:14 PM   #12
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Hi,
On an 08 Ventana it depends if you have a rear or side radiator. Rear radiator will be very difficult to see. Side radiator the compressor should be in front of you when you raise the hood.

If you want this serviced by Newmar, make sure they know it is on your list before you get there. Newmar does not do dash A/C. The service calls are subcontracted to the vendor that does the A/C on the new production coaches.
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Old 07-25-2018, 01:27 PM   #13
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I run my dash air in recirc, not fresh. Every AC system in life runs in recirc except dash air. Cooling already cool air produces even cooler air. Cooling hot outside air -- not so much, and by bringing in outside air, you are forcing out already somewhat cooled inside air. Cooling the coolest air produces the coolest air.
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Old 07-25-2018, 01:47 PM   #14
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Quote:
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I run my dash air in recirc, not fresh. Every AC system in life runs in recirc except dash air. Cooling already cool air produces even cooler air. Cooling hot outside air -- not so much, and by bringing in outside air, you are forcing out already somewhat cooled inside air. Cooling the coolest air produces the coolest air.
Not just cooler air, using recirculated air reduces the humidity in the air, making it feel cooler.
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