subject:"Re\: \[MBZ\] AC Machines"

Re: [MBZ] AC machines

2022-04-26 Thread Buggered Benzmail via Mercedes

Strong work!

--FT
Sent from iFōn

> On Apr 26, 2022, at 5:00 PM, Kaleb Striplin via Mercedes 
>  wrote:
> 
> You recall my old robinair AC machine was giving me an error, and called 
> local service center who wanted $180 to look at it, then parts etc. I just 
> bought a 1 year old new machine. Messed with the old one some more and 
> figured it had to be one of the pressure transducers. When powered on it 
> shows low pressure error. Unplugging the connector to the transducer the 
> error would go away. When trying to do a recovery the display would always 
> show 31inhg. At the end when trying to do an oil drain it would fail. I then 
> figured if the transducer was bad, it would not know if the was draining or 
> not. Looking up the part number I found the new transducers listed for sale 
> for about $160 each off the robinair part number. These apparently are 
> supplied by a different manufacturer than original as they look different. I 
> then used the photo of the robinair part to get the manufacturer and part 
> number, did a search and turned up the same transducer for $27 each. Ordered 
> 2, replaced both of them to be sure and it’s now working fine. No errors, 
> does a recovery and oil drain just fine. Since I already bought a newer 
> machine I will probably put the old one up for sale as I don’t think I really 
> need 2 of them do I?
> 
> Sent from my iPhone
> 
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Re: [MBZ] AC Machines

2022-04-05 Thread Kaleb Striplin via Mercedes

That is great input.

On 4/5/2022 8:57 PM, dan penoff.com via Mercedes wrote:

Or something else to add to the back 40!

-D

On Apr 5, 2022, at 6:52 PM, Kaleb Striplin via Mercedes
wrote:

This machine has 2 pressure transducers one for the low side and one for
accumulator. When I switch the connectors between the 2 the error changes to
accumulator pressure error so to me that tells me the low pressure one is bad.
If I leave the connections disconnected I get no error. The bigger problem is
why it’s venting refrigerant. I suppose I could pay the diagnostic fee and see
what I am looking at. Just afraid even if I get it fixed then something else
goes wrong. I guess I could buy that one like mine and keep this one for parts.

Sent from my iPhone

On Apr 5, 2022, at 8:42 PM, Allan Streib via Mercedes
wrote:

If it were me and I trusted the shop I would probably pay the $180 for the
diagnostic. Once you know what's wrong, you can decide whether to have them
repair it, do it yourself, or replace it.

Otherwise it's a careful, deliberate process of testing and elimination to
figure out what is wrong and repair it. What is your time worth?

On Tue, Apr 5, 2022, at 9:24 PM, Kaleb Striplin via Mercedes wrote:
I have a Robinair 34788 fully automatic machine that I have had for
about 4 or so years now. Nearest I can tell it is probably 10-15 years
old, not sure. Per the menu look like it has has around 2600 lbs ran
thru it. Not sure if that is a lot or not for these machines. Anyway,
last year it got to where it was throwing a low pressure error when you
turn it on, then gives an oil drain error when doing a recovery.
Several times it has ended up venting all of its stored R134 thru the
vacuum vent line into the oil drain bottle. I also suspect the ball
valves on top of the internal tank are leaking. I am betting the low
pressure error is the low pressure transducer. I also tested the
solenoids and they all appear to work so I am thinking the oil drain
error could be the circuit board. When it is supposed to be doing an oil
drain it never even opens the solenoid.

Called a local service place for these and if they come here its $250
for the drive plus $180 for the diagnostic, or I can take it to Tulsa
and just pay the $180, then pay whatever labor for the repairs plus
parts. Assuming it needs all 3 ball valves those are around $60 each.
The transducer is around $150 to $180 depending on the website. Circuit
board is about $350. So if it actually needs all this I would probably
be looking at a grand to fix this machine. That does not factor in any
additional labor.

I would always just order the transducer and see if that fixes the rest
of the problems (which I am not hopeful of), or pay the $180 to see what
is wrong and what it would cost to fix it. I am however considering
just buying a newer machine. There is one exactly like mine but appears
to have been used a lot less and includes a 30lb cylinder:

https://www.facebook.com/marketplace/item/5143233472435476/?ref=search_code=marketplace_search_story_type=post=browse_serp%3Adc0e9849-915e-40a4-b3d5-28817f9adfa7

Also looking at these:

https://www.facebook.com/marketplace/item/965256667454473?ref=search_code=marketplace_search_story_type=post=browse_serp%3Adc0e9849-915e-40a4-b3d5-28817f9adfa7

https://www.facebook.com/marketplace/item/274691608128011?ref=search_code=marketplace_search_story_type=post=browse_serp%3Adc0e9849-915e-40a4-b3d5-28817f9adfa7

https://www.facebook.com/marketplace/item/698606498164730/?ref=saved_code=null

I know these are a lot of money but I actually do quite a bit of AC work
for my own fleet of cars and projects. Anybody have any thoughts on
fixing mine or spending the money on a newer one?

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