Quick question... Are these the guages I need to do what Matt describes?

http://cgi.ebay.com/ebaymotors/a-c-ac-Manifold-Gauge-and-Hose-Set-r134-r-134_W0QQcmdZViewItemQQcategoryZ43989QQihZ017QQitemZ270231185451QQrdZ1QQsspagenameZWDVW

http://cgi.ebay.com/ebaymotors/MAC-134-AC-guage-set_W0QQcmdZViewItemQQcategoryZ43989QQihZ012QQitemZ220224932464QQrdZ1QQsspagenameZWDVW



How do the lines hook up? Looks like 5 lines... one to the 134 can, one to the "high" side, one to the "low" side... where do the other two hook up?

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Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

It's been 4 years since I worked for Benz, but I recall leaks at the line (low side ?) to the dryer to be common on 210's.

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Sharing my partner's 2012 Forte 5dr SX til I find my next 123 or 126..
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Do I miss being a service advisor ???

Notfarnow, that set looks to be what you need. There are lots of brands and models, but they all share the same stuff. Skip Ebay and go with a reputable seller, such as a brick and mortar store or a place like ackits.com.

You need to ensure that you get R134a fittings (which it looks to have) and 1/2 ACME fittings for the refrigerant hose (yellow). I can't tell the fitting size from the image. 1/4 SAE is standard for R12 and R22, so these are sold too. Of course they are not interchangeable, but adapters are available.

There are three lines there. There is one red and one blue hose. There are "blank" connectors on the sides of that unit to clip unused hoses, and that's where they are clipped.

Thanks a ton, matt

So when I get the guages (I am having a hard time finding them locally), what pressures am I looking for as I charge the system?

I maybe could've perhaps not-quite-sure have/will have/could have some r134 that mighta(maybe) fell off a truck

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Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

There isn't one correct pressure. It's a set of charts. When you get the equipment, I'll track down the charts (if someone else doesn't beat me to it).

right on, thanks

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Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

Be sure to thoroughly understand the operating instructions on the gauges. Unless they're different than mine, it's possible to open the valve on the high side and allow high pressure gas into the r134 supply can and blow it up in your face.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

I have never seen a manifold set where this was not the case.

So the "blow up in your face" feature is non-optional? Not ideal

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Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

Less than ideal, that is true. But it is the industry standard tool.

OK, I expect to have the gauges tonight, and I have some r134.

My understanding is that I feed to the low side, and periodically close the valve before checking the pressure on the HIGH side.

Also, where is the fitting for the "high" side? I haven't been able to find it

__________________
Jake
1999 e300d PlantDrive WVO/SVO conversion
**note to self: oil changed at 268k kms**
1990 Toyota 4Runner FrankenDiesel swap

I occasionally top off my AC via the low pressure side feed with a simple guage from Walmart - don't really need anything else if you're looking to add freonto the system - on the ACC panel, if the #7 (I believe) reading goes to 30 then it kicks off the compressor. Usually in the high teens or low 20's is where I've found my AC to run nicely. If it's lower than that I will add a small can of r134 freon to the system to "top it off" ....

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#dieselFLEET
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'97 E300
'99 E300

The high-side fitting is located at the left (US driver's) top corner of the condenser, in the front. There is a small plastic cover on mine which clips to the auxiliary fan shroud.

At some point, it is a good idea to check the reading at #7 against what you read at the high-side port. The pressure and temperature transducers are located on the outlet of the receiver/dryer.

A restriction in the condenser or dryer will cause the high-side to exceed what you see at the transducer (and thus at the #7 reading, if everything is working correctly). Sometimes it will exceed the value significantly. If so, the compressor will see dangerously high pressures but the climate-control system will not shut it down.

The compressor will kick off if the pressure is too high on #7.

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#dieselFLEET
---------------
'97 E300
'99 E300

If the pressure reading at #7 is incorrect, what shuts it off?

As I said, a restriction in the condenser or the dryer will cause the reading at #7 to read artificially low.

Mine reads 4 with 350psi at the high side.