Vintage Air System not too cool????!!!!

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funwithfuel said:
If you run your fans continuous, your low side should show 15-20psi .
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65-440 said:
I agree, 6-12psi low side is too low. 20 sbould be right on. !
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I actually went and downloaded some of VA's stuff, and they say SEVERAL times that 6-12 is what they want. Evidently they are doing some trickery to do that. IF they are willing to warantee the system that way, and IF they have some control we obviously are missing the trick on, but I agree, I don't know why they would do it this way.
 
Fresh air is sealed off, so it's getting air from the "cabin". Since I dont know jack sh1t about a/c, I cant comment on the pressure's.
 
A/C is not that difficult once you work with it for a while. Have y
ou felt the high/low side lines when the compressor is running ?
 
Yeah, 1 is hot and the other is cold.
 
Had to reschedule for next week for a couple of reasons, it's not hot and they were behind, so next week it is.
 
Is the line from the evap to the compressor really cold? Is your evap drain, well, draining?
 
Rev, that line gets cold and you can see the condensation on it. The drain does drain, not too much though as the humidity has been in the low teens here.
 
I'm still thinking you have a mixing problem. What's the part number on the unit you got?
 
Sounds like your a/c is functioning as it should. You sure your blend door is fully closed ? Allowing all the air to pass through the evaporator ? If it is not sealed fully you will get hot air from the heater core coming out of the vents mixing with the cooler air from the evaporator. Just a thought !
 
Rev, not sure of the part number, its a gen iv.

I have checked the servo motor on the blend door and it works as it should, so I'm out of ideas.
 
Just because the servo is working doesn't mean the door inside the box is sealing. I would pull the servo off of the door and turn the door by hand. It should move freely from stop to stop. Maybe have the a/c on and feel the temp change from full hot to cold.
 
65-440 said:
Just because the servo is working doesn't mean the door inside the box is sealing. I would pull the servo off of the door and turn the door by hand. It should move freely from stop to stop. Maybe have the a/c on and feel the temp change from full hot to cold.
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I agree. I tried to look up a parts breakdown/ service manual for the unit, but all I find on their website is install manuals.
 
Hell. it couldn't hurt to visually check the door movement, I'll do it.

Yeah, VA doesnt give a breakdown on how the unit is put together. The blower motor comes off with 4 screws, maybe I can see something from that side since the blend door is next to it.
 
5.7 hemi said:
Hell. it couldn't hurt to visually check the door movement, I'll do it.

Yeah, VA doesnt give a breakdown on how the unit is put together. The blower motor comes off with 4 screws, maybe I can see something from that side since the blend door is next to it.
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If you call/ contact them, try and get an explanation of how and why they insist on running the evap pressure so low?
 
67Dart273 said:
If you call/ contact them, try and get an explanation of how and why they insist on running the evap pressure so low?
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Very good question !!

I doubt you will be able to see the blend door through the blower motor, if you can see anything will most likely be evap core, maybe heater core. not sure how that box is setup though. physically moving the door by hand will be the best
 
These units do run a bit low, but seem to do well on R134a. I usually worry more about the high side pressures. You also can't use the sight glass as an absolute indicator with 134.
 
67Dart273 said:
If you call/ contact them, try and get an explanation of how and why they insist on running the evap pressure so low?
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Because a higher pressure creates harmonics that annoy the heck out of you...at least that's what the Vintage Air tech told me. He said to keep the pressure as low as possible while still staying in the range.

I first had mine charged by the local AC specialist and he had it charged to the high number. My system shuddered at max cooling settings, but it stopped when he lowered it to the low number.

You may have different results.
 
GaryS said:
Because a higher pressure creates harmonics that annoy the heck out of you...at least that's what the Vintage Air tech told me. He said to keep the pressure as low as possible while still staying in the range.

I first had mine charged by the local AC specialist and he had it charged to the high number. My system shuddered at max cooling settings, but it stopped when he lowered it to the low number.

You may have different results.
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Really ! I don't remember ever having a harmonics issue due to system pressures, balance issue yes but not pressure related ! That's crazy ! How "high" are the high numbers ?? I do a/c work everyday and 20-30 low side is good ..... Not saying VA is wrong, but if I saw 6-10 low side, that means restriction, bad compressor or low charge !
 
65-440 said:
Really ! I don't remember ever having a harmonics issue due to system pressures, balance issue yes but not pressure related ! That's crazy ! How "high" are the high numbers ?? I do a/c work everyday and 20-30 low side is good ..... Not saying VA is wrong, but if I saw 6-10 low side, that means restriction, bad compressor or low charge !
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They do get a nutty vibe thing going if they are loaded up on 134. Kinda like a pig that's fat on slop.
 
I should add that I've had the other aftermarket units do the same thing. I've no idea why.
 
That's weird ! ..... at 1lb / 8Oz (1.5lb ) freon system charge spec, do they have to be seriously overcharged to get this vibe, like in the 3lb area ?? .... Just curious ...
 
No, they don't have to be overcharged by all that much. It's been a while, but I thought it was around a half pound. It's just a funky little vibration or a hum/groan type of deal. You don't notice it if you're not paying attention to it, but once you hear/feel it, you feel it every time.
 
1.8lbs, or 28.8oz. It's not 1 lb 8oz, that threw me off too.
 
I know I asked this before , but I haven't seen a response . do you have an expansion valve or an orifice tube . if you are running with an orifice tube your low side pressure will be lower. and it is very easy to over charge them . ford's use orifice tube chrysler and gm have always used expansion valves but this is aftermarket again if you want the fan continually you should see clear fluid through your sight glass if you have 1 follow your lines from your compressor to your evaporater coil. the line should be hot from your compressor to the dryer to the condenser and then it should continue to be hot up to the orifice tube or expansion valve then at that point you should see frost or condensation forming on the lines if you see frost or feel cold on any line ahead of the evaporator coil you have a restriction if only 1 or 2 coils of the evaporator are cold then you have a restriction it's easy to plug up in air conditioning system with a small piece of o o ring dirt tape sealants anything
 
another thing to consider did the manufacturer of the kit give you a specific volume of oil to use too much oil will cause ineffective cooling
 
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