AC Low port
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Tuned
Joined: Aug 2013
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So, there's a service valve right along the passenger fender , just as it goes into what I think is the dryer. The freon can fitting fits over it. The service port valves are different sizes, right? So this is the low side because the charge fitting fits on the service valve? Can anyone confirm this?
Cargo Master
Joined: Sep 2012
Posts: 2,112
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From: Eastern TN
The Haynes manual says it should be along the passenger fender but ours is on a vertical pipe on the driver side of the engine such that the doghouse or air cleaner have to come off.
Isn't the dryer on the high side of the circuit? Our dryer is on the driver side of the radiator. If AC's working at all, low side pipe/s will be much cooler than high side.
Sixto
93 E150 Chateau 5.8 190K miles
Isn't the dryer on the high side of the circuit? Our dryer is on the driver side of the radiator. If AC's working at all, low side pipe/s will be much cooler than high side.
Sixto
93 E150 Chateau 5.8 190K miles
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Tuned
Joined: Aug 2013
Posts: 414
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The Haynes manual says it should be along the passenger fender but ours is on a vertical pipe on the driver side of the engine such that the doghouse or air cleaner have to come off.
Isn't the dryer on the high side of the circuit? Our dryer is on the driver side of the radiator. If AC's working at all, low side pipe/s will be much cooler than high side.
Sixto
93 E150 Chateau 5.8 190K miles
Isn't the dryer on the high side of the circuit? Our dryer is on the driver side of the radiator. If AC's working at all, low side pipe/s will be much cooler than high side.
Sixto
93 E150 Chateau 5.8 190K miles
The valve cap is black if that means anything. And how about the service ports being different sizes? That's true isn't it? I know on Dodges it's true, but I've never tried to top off a Ford AC system before. If this is the high side, the can's fitting should not fit, correct? And BTW the AC doesn't come on at all so I can't do the temp feel check.
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Tuned
Joined: Aug 2013
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Update- That is indeed the low port. I put the can of recharge in and the AC is operational again. Sixto, your location reference seems to be correct in my case. And man, that is a super easy place to have an AC service port.
Laughing Gas
Joined: Apr 2014
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No, it was changed to R134 in 1994 on the vans.
WarrensE350.......even thought you answered your own question, your correct that the low pressure service port is on top of the dryer, on the right fender.
The high pressure port is mostly on the left side of the engine, line leading to the condenser. And a add-a-can of coolant will not fit on the quick connect fitting.
If the pressure is to low, the compressor will not kick on, as you were adding coolant, that increased the pressure to trip the compressor's clutch switch.
If the pressure is way too low, you can jump the wire connector at the dryer to trip the compressor clutch to suck in new coolant to.
WarrensE350.......even thought you answered your own question, your correct that the low pressure service port is on top of the dryer, on the right fender.
The high pressure port is mostly on the left side of the engine, line leading to the condenser. And a add-a-can of coolant will not fit on the quick connect fitting.
If the pressure is to low, the compressor will not kick on, as you were adding coolant, that increased the pressure to trip the compressor's clutch switch.
If the pressure is way too low, you can jump the wire connector at the dryer to trip the compressor clutch to suck in new coolant to.
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Tuned
Joined: Aug 2013
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No, it was changed to R134 in 1994 on the vans.
WarrensE350.......even though you answered your own question, your correct that the low pressure service port is on top of the dryer, on the right fender.
The high pressure port is mostly on the left side of the engine, line leading to the condenser. And a add-a-can of coolant will not fit on the quick connect fitting.
If the pressure is to low, the compressor will not kick on, as you were adding coolant, that increased the pressure to trip the compressor's clutch switch.
If the pressure is way too low, you can jump the wire connector at the dryer to trip the compressor clutch to suck in new coolant to.
WarrensE350.......even though you answered your own question, your correct that the low pressure service port is on top of the dryer, on the right fender.
The high pressure port is mostly on the left side of the engine, line leading to the condenser. And a add-a-can of coolant will not fit on the quick connect fitting.
If the pressure is to low, the compressor will not kick on, as you were adding coolant, that increased the pressure to trip the compressor's clutch switch.
If the pressure is way too low, you can jump the wire connector at the dryer to trip the compressor clutch to suck in new coolant to.
Original symptom was that when it warmed up enough this year to use the AC, I noticed it wasn't working, and the condenser wasn't even kicking on. Last time I used it in the Fall, it was fine.
I checked fuses and re-seated connectors but nothing helped, so I guessed that it was possibly low on charge. I had one of those DIY recharge cans with a gauge in it, so I figured even crudely it would tell me what the pressure was. And it was low, so low that the condenser wouldn't even cycle on and off quickly. After that big can (and part of another) went in, the air is actually colder than it was when I got it (can guage shows the pressure at 34, ambient temp at the time was 75F). I'm hoping that means the leak was very gradual and I have bought myself some time with this addition. I guess I'll find out soon enough.
Thanks to all for the replies. And really, I have never seen a more convenient low service port location.
Cargo Master
Joined: Sep 2012
Posts: 2,112
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From: Eastern TN
The compressor should engage in DEFrost mode to dehumidify. You might not notice since ambient air is usually cold when you defrost and the heater is also going full tilt. We can get by without AC most of the time but a full complement exhaling on a rainy night fogs the windows quickly with no compressor. Umm... I didn't mean that!
Sixto
93 E150 Chateau 5.8 190K miles
Sixto
93 E150 Chateau 5.8 190K miles
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