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Need some AC advice/help EXP VALVE FIXED!!!!!! |
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Heavy 488 
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Joined: Apr/27/2019 Location: In the Status: Offline Points: 3552 |
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 Posted: May/07/2020 at 12:44pm |
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You already saw the compressor able to hit 150 with the suction closed. what target number were you shooting for that needs another compressor?
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Texas275
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Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: May/07/2020 at 12:48pm |
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I agree with you. That's why I'm replacing the valve.
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george w
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Joined: Jan/27/2013 Location: New Jersey Status: Offline Points: 2899 |
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Posted: May/07/2020 at 12:54pm |
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Sure sounds like the expansion valve is stuck open. The system depends on that restriction to develop the pressure differential.
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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Texas275
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Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: May/07/2020 at 4:05pm |
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So I came up with a question as I was pulling the expansion valve off.
Does the expansion valve have to be oriented in any particular position. Mine is in upside down, silver flat disc down. That’s how I had to place the evaporator behind the dash. Would that keep it from working properly? If it has to be turned over, can I add a U shaped line to move it and turn it right side up, To keep from having to move the evaporator?
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Heavy 488
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Joined: Apr/27/2019 Location: In the Status: Offline Points: 3552 |
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Posted: May/07/2020 at 8:08pm |
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Only flow direction should matter, not rotation.
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Texas275
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Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: May/07/2020 at 8:29pm |
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Got it, Thanks
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Texas275
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Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: May/11/2020 at 5:43pm |
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I took my expansion valve to the local Orileys and they brought out 10 different ones to see if they would fit. None of them fit. They all said #6 and #8 male ends but the #8 was too big for my fitting to screw onto.
I have ordered one from Nostalgic Air. I’m hoping it fits and I don’t have some weird, one off, expansion valve.
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george w
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Posted: May/11/2020 at 6:31pm |
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Using R-12 or R-134 and does it matter ? Shouldn't the usual AMC vendors have the proper valve ?
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Long time AMC fan. Ambassador 343, AMX 390, Hornet 360, Spirit 304 and Javelin 390. All but javelin bought new.
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: May/11/2020 at 6:42pm |
Well it could be defective, as it is a low cost item, that is a wee bugger to get to if all finished up. As for difference yes there is. But most are happy with original R12 valve. If your doing a whole new kit or upgrade, I suggest obtaining R134 valve if possible to swap out. It does make it cooler, as the system does not cycle as much. It should cycle once every 2 minutes, but it depends on capacity and tempratures. Between once every minute or two is good. The less cycling the more efficient the system. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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Texas275
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Joined: Dec/18/2013 Location: Forney, Tx Status: Offline Points: 469 |
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Posted: May/11/2020 at 8:42pm |
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The evap is set up as 134. It is a cheap model and I may be paying for that now. I put the numbers that are on the valve into google and it only came back with a few results, all of them overseas, and only a couple in English
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george w wrote: