Air con fault finding tips C class, anybody?? :)

[kris30]

Hiya, just a follow up my other post.

Just an easy question

What should be seen in the window in the 'A/C drier?', the thing down by the ABS modulator, behind the passenger side headlight. Its got a window on the top where its shows a flow of liquid/gas.

What should be seen?

A constant flow of liquid?

An interupted flow?

The reason i ask is that my air con doesn't cool to ice cold, its just cold, if you get me

I'm doing some fault finding.

Any advice or pointers please

Kris

 

[wscheffer]

Probably just needs a charge.

 

[BlackC55]

or top up. Get a service carried out.

 

[Andy Wr]

Get someone to hold the revs at 2,000 rpm, check the sight glass and it should be full or completely clear, let go of the revs and you will have a few bubbles due to the fact that the compressor is now running slower and its duty expressed in btu/hr or kw's is now less, also if the condenser is blocked with road debris the high pressure vapour can not condense into a liquid and will produce what we in the trade call "flash gas" which would also be evident in bubbles in the sight glass, a further give away would be the filter drier would be hot to the touch.