Re: [MBZ] AC Pressure Question

Yes, IIRC. It just circulates, doesn't do much cooling. A similar effect is seen with leaking reed valves in the compressor. To use electrical analogs, you are attempting to debug a power-delivery system using only a voltmeter (pressure), and no ammeter (current, flow). Too bad there isn't a

Re: [MBZ] AC Pressure Question

If the evaporator isn't clogged with garbage and you have the fan setting on auto and it's in the low to mid 90's outside like it's been up here in Alachua then that's the best you are going to see, or at least that is what I have. Put the fan on low and you should be getting temps in the

Re: [MBZ] AC Pressure Question

In your shoes, I'd try adding a bit more while watching the vent temperature, see if the vent temperatures come down. If you're already overcharged, you'll just be more overcharged. If you're under-charged, you'll see an improvement. -- Max Dillon Charleston SC '87 300TD '95 E300

Re: [MBZ] AC Pressure Question

On Sat, 25 Jun 2016 13:48:20 -0400 Dan Penoff via Mercedes wrote: > I fully understand the fundamentals of an AC system, however, I noticed > something today while working with my car that has me scratching my head. > Maybe it’s obvious and I’m just missing something

Re: [MBZ] AC Pressure Question

That's the deal with blends, you would have to remove it all and charge again because the different gasses leak off at different rates. Sent from my iPhone > On Jun 25, 2016, at 9:01 PM, Dan Penoff via Mercedes > wrote: > > I’m going to go with this for a few days and

Re: [MBZ] AC Pressure Question

I’m going to go with this for a few days and see how it works. If it’s as good as R134a I’ll leave it in until I can swing a larger condenser, and at that time I’ll go back to R134a. If I’ve overcharged how do I know how much to remove? Or do I just have to evacuate and start all over again?

Re: [MBZ] AC Pressure Question

I hate blend refrigerants. I have used them before and one time they work fine and another time they don't. I can only assume one of the component ratios was off or something. Sent from my iPhone > On Jun 25, 2016, at 8:45 PM, Dan Penoff via Mercedes > wrote: > > I’m

Re: [MBZ] AC Pressure Question

I’m sure there’s no air in the system. Recommended charge with the es-12a industrial is 14 ounces based on an R12 capacity of 2.5 pounds. That’s two cans plus a third of a third can. That’s what I put in it based on weight. Right now I’m seeing low side pressure in the 45 psi range and high

Re: [MBZ] AC Pressure Question

What would a stuck open expansion valve result in? I would assume low too high and high too low? Sent from my iPhone > On Jun 25, 2016, at 8:15 PM, Jim Cathey via Mercedes > wrote: > > A clogged expansion valve results in extra-low inlet pressures, as the > thing tries

Re: [MBZ] AC Pressure Question

A clogged expansion valve results in extra-low inlet pressures, as the thing tries to suck a vacuum. Overcharged? Air in it anyway? On Sat, Jun 25, 2016 at 2:46 PM, Mitch Haley via Mercedes < mercedes@okiebenz.com> wrote: > > Obstructions to the gas flow show up as temperature drops. > >

Re: [MBZ] AC Pressure Question

Obstructions to the gas flow show up as temperature drops. Ideally, the expansion valve should be the only such obstruction. Mitch. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery

Re: [MBZ] AC Pressure Question

Is the heat exchanger nice and clean so ur actually gitting good air flow across it? Dirty, clogged up? --JC On 6/25/16 5:33 PM, Dan Penoff via Mercedes wrote: I know. After letting the car sit for 30 minutes or so, I’m seeing what I would expect for static pressures. Around 1800 RPM I’m

Re: [MBZ] AC Pressure Question

I know. After letting the car sit for 30 minutes or so, I’m seeing what I would expect for static pressures. Around 1800 RPM I’m seeing around 45 psi low side, 225 psi high side with around 60F at the vent. Any other suggestions? Dan > On Jun 25, 2016, at 5:31 PM, Kaleb C. Striplin via

Re: [MBZ] AC Pressure Question

Expansion valve replacement is a whore of a job on the 126. Sent from my iPhone > On Jun 25, 2016, at 4:15 PM, G Mann via Mercedes > wrote: > > I suspect expansion valve loss of full function.. either by partial > blockage [system debris or pending failure]. > > The

Re: [MBZ] AC Pressure Question

I suspect expansion valve loss of full function.. either by partial blockage [system debris or pending failure]. The expansion valve controls.. well.. expansion... The conversion rate of liquid to gas, in simple application for AC systems.. See Boyle's law for further in depth details of how this

Re: [MBZ] AC Pressure Question

I knew the system was tight, I was more concerned about getting any moisture boiled out. Nearly an hour with the vacuum on the system (pump off, valves closed, of course) and no leak down. Dan > On Jun 25, 2016, at 3:20 PM, Kaleb C. Striplin via Mercedes > wrote: >

Re: [MBZ] AC Pressure Question

Discussion List" <mercedes@okiebenz.com> Cc: "Kaleb C. Striplin" <ka...@striplin.net> Sent: Saturday, June 25, 2016 3:20 PM Subject: Re: [MBZ] AC Pressure Question Holy crap dude you went about that all backwards. You only vacuum for about 5 minutes then clo

Re: [MBZ] AC Pressure Question

Holy crap dude you went about that all backwards. You only vacuum for about 5 minutes then close it off and stop and let it sit for a while and see if it leaks down, then proceed to vacuum for an hour or so. It's a waste of time to spend all that time doing the vacuum then checking for leaks.

Re: [MBZ] AC Pressure Question

Low side pressure is determined by evaporator temperature and expansion valve opening -- it's possible you have cooler (and hence denser) high side liquid with the fans on, which would result in more gas by weight for a given expansion valve opening. More gas, same temp has higher

Re: [MBZ] AC Pressure Question

I’m pulling a vacuum on the car right now - it’s been almost an hour and a half with it solidly at or near 30” of vacuum so I’m not worried about leaks. I’ll shut it off at the top of the hour, close the gauges off and let it site for 30 minutes to see if there’s any leak down before I start

Re: [MBZ] AC Pressure Question

Simple physics! I'm sure someone can explain the physics, but not Max. I was also getting very strange gauge behavior when I filled my 124.193 with hydrocarbon refrigerant. That may be due to my cheap-o harbor freight gauges. I focused on filling by weight. I think the high pressure side

Re: [MBZ] AC Pressure Question

Dan Penoff via Mercedes June 25, 2016 at 12:48 PM I fully understand the fundamentals of an AC system, however, I noticed something today while working with my car that has me scratching my head. Maybe it’s obvious and I’m just missing something but I figured I

[MBZ] AC Pressure Question

I fully understand the fundamentals of an AC system, however, I noticed something today while working with my car that has me scratching my head. Maybe it’s obvious and I’m just missing something but I figured I would toss it out here and see what the collective AC wisdom says: **System is