PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/index.php)
-   Tech Help (http://www.peachparts.com/shopforum/forumdisplay.php?f=1)
-   -   Vent Temps Unsatisfactory (http://www.peachparts.com/shopforum/showthread.php?t=191462)

E150GT 06-16-2007 04:18 PM

Vent Temps Unsatisfactory
 
I recently changed the expansion valve in the ol 420 sel and recharged with R-12 with three cans and the vent temps stay around 60 degrees when it's 76 outside with high humidity. I filled it up until full but still no change. This thing used to blow out 40 degrees at the vents no problem. What's the dealio?

jbaj007 06-16-2007 05:50 PM

Why was this done? leak?
Did you replace the R/D?
Did you pull a vacuum?
3 X 12 oz. cans = 36oz.. My 126 calls for 46.4 oz. Undercharged? 16 oz. cans?

E150GT 06-17-2007 02:08 AM

The expansion valve was leaking and the first attempt to fix it failed because I got lazy and only changed the o-rings on the lower lines and the drier. i finally bit the big one and changed the expansion valve and added a little oil and had the system vacuumed and I charged it with three 12oz cans and it resulted in terrible cooling. Then I bought another can of r-12 and filled it until no more bubbles in the sight glass and it resulted in no changes.

brewtoo 06-17-2007 12:35 PM

Is the car moving when you are taking these temp readings? Or is it sitting in the driveway?

hk20000 06-17-2007 12:49 PM

I have similar problems with my W202 that already ran on R134 when it rolled off the factory.

I can get almost no cooling if the car is at rest.... and only acceptable A/C when the car is on the freeway.... street is similar.

When you stop the A/C is pretty much non-existent.....and if you switch on AC (leave ACC to auto and set a lower-than-ambient temp) and park your car for a bit the water temp goes up to 100C....

before the R134 recharge it would not do that.... but I was confirmed by other members that this was normal. I haven't driven the car in the really hot weather yet (never above 25C) so I don't know if the hot weather will make the A/C work better or worse.

But if your car isn't moving yeah the A/C is definitely not too happy about it.

E150GT 06-17-2007 08:37 PM

Thats the problem. It cools ok at highway speeds but it is terrible at idle. It is still r-12 and always cooled down to 38-40 degrees no problemo. It struggles to get below 60.

Arthur Dalton 06-17-2007 08:53 PM

Aux fan running ???

Jumper this sw and see if fan comes ON

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23I0RAMEE24118NOLA&year=1986&make=MB&model=420-SEL-001&category=R&part=A%2FC+Temp.+Switch

brewtoo 06-17-2007 09:59 PM

Quote:

Originally Posted by Arthur Dalton (Post 1538942)
Aux fan running ???

Jumper this sw and see if fan comes ON

:D Arthur, you're getting quite a work-out on the aux fans this year!

lee polowczuk 06-17-2007 10:35 PM

i know i have done an aux fan on the 260e

city driving an 90 degree temps are still a bit problamatic...but it will freeze you out on the highway

Arthur Dalton 06-18-2007 06:54 AM

Quote:

Originally Posted by brewtoo (Post 1538993)
:D Arthur, you're getting quite a work-out on the aux fans this year!

It's that time of year again...pretty hot everywhere , too...

It is amazing how far along this Forum has come as far as DIYer a/c knowledge...I haven been here since day one, and I can remember when no one would even dare touch their a/c system [ or know anything about it]..so, the Forum has done well on a/c edumacating it's members in this highly specialized field......
There are reg guys here who now know more about their a/c systems than the guy they used to take it to.
Gotta love it ...........

emerydc8 06-18-2007 07:59 AM

I don't know about my knowing more than the guy I used to take it to, but it sure has helped me. Thanks again!

Arthur Dalton 06-18-2007 08:09 AM

I can remember when a/c was a new car thing.... our running joke when a guy would ask " "..uuum , What kinda' Gas do you put in there?? "
.....of course our answer was .."High-Test !! "

E150GT 06-18-2007 08:10 AM

Aux fan works because when i replaced the drier I bought the little red leads that everyone says go bad and it started working again. Should the expansion valve be hot on one side? I know the front of it gets hot and the back is cold.

Arthur Dalton 06-18-2007 08:30 AM

<<I bought the little red leads that everyone says go bad and it started working again. >


The red leads ?

Are you talking about the sw with the pigtail leads ?
Do you have gauge readings ?

E150GT 06-18-2007 08:55 AM

Quote:

Originally Posted by Arthur Dalton (Post 1539250)
<<I bought the little red leads that everyone says go bad and it started working again. >


The red leads ?

Are you talking about the sw with the pigtail leads ?
Do you have gauge readings ?

Yes those leads that go on the drier. I do not have any gauge readings.


All times are GMT -4. The time now is 05:20 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website