Air recirculation button again

[kebo57]

Hi there I posted a Question last week about the air conditioning on my ML 270, but I don't think I got my point over

When the A/C button is pressed and the blower is set to 1 our more this should lower the temperature, also if the recirculation is on the air con should take in cold air from inside the motor and cool even further.

But how cool should the interior become
How would I now if the air con is working

PS I have only owned the motor for one week

Any help will be appreciated

 

[Blobcat]

With the AC on the car should get cold, really cold, very cold, too cold.
MB take the point of view that if AC is fitted it should always be on, the EC switch is only illuminated when the AC is off. To check the AC set the temp to full cold and fan on full. If you open the bonnet you should see the compressor running (Front RHS) switching the EC button you will see the compressor start and stop.

 

[television]

switching the EC button you will see the compressor start and stop.

I hope that Kebo57 has very long arms

Malcolm

 

[Blobcat]

Mr Tickle perhaps?
If not then an able assistant to press the button.

 

[kebo57]

Thanks for the reply Blobcat
I will check when I get home from work, but reading the owners manual there is no referance to EC

What would the compresor look like would it be belt driven, their would be pipes to a rad and to the bulckhead mybe.

Many thanks Kebo57

 

[television]

The compressor normally sit on the left of the engine when veiwed from the front at the top. Yes there are two pipes going to the back of it and 1 plug for the electrics.

Malcolm

 

[Rory]

Hi there I posted a Question last week about the air conditioning on my ML 270, but I don't think I got my point over

When the A/C button is pressed and the blower is set to 1 our more this should lower the temperature, also if the recirculation is on the air con should take in cold air from inside the motor and cool even further.

Yes.

But how cool should the interior become

If you have the temperature set to its lowest, then pretty cold.

How would I now if the air con is working

It should be pretty instantly noticeable - especially if the car steams up when wet, turning the a/c on should clear it within a few seconds.


Re the other posts about the compressor - it's driven by the belt all the time, and engaged with an electric clutch, so I'm not you'll see any difference on or off.
If the a/c doesn't work then it may (hopefully) just need regassing.

 

[Blobcat]

It is driven by a belt, you will see the centre part spin up when the clutch engages.

 

[kebo57]

Thanks for the reply chaps

I have located the compressor it is on the near side under the what look like the power steering pump, pipes are connected not with compresion fitting but with sort of single bolted flange.

I looked at all the fuses under the bonnet all ok but no fuze designated for a/c would there be a warning light for low gas, next step is to check electric clutch

I will look for the centre part spin up when the clutch engages.

Thanks again everybody

 

[Blobcat]

No warning light for low gas, just the compressor will not engage.

 

[Rory]

Where did you buy the car? If from a dealer then suggest you ask them to fix it.

It could well be low on gas, and, while they do need recharging now and again, it could be low beacuse it's leaking somwhere. You could be looking at a hefty bill to get it sorted.

 

[kebo57]

I have looked to see the centre part spin up when the clutch engages. but the front part is not spinning with a/c on our off there is a gap of about 20 thow between front part of pulley and the pulley itself, would this be taken up if clutch is working
maybe I could put 12v down to the clutch
maybe I have a problem with switch

 

[Blobcat]

Out of gas

 

[panason1c]

maybe I could put 12v down to the clutch

Dont do that!.......The system disables itself for good reason when the gas is too low.....if you are out of gas then you probably dont have any oil in the system either as it would have escaped with the gas...'hot wiring' the compressor to run without oil would destroy it ... .

Let an A/C specialist look at it.

 

[television]

You can apply 12v To the clutch if you remove the cables first,if the car has been out of ges for a long time, it is a much longer process to re charge as the whole system has to be dried out.

Malcolm

 

[kebo57]

Thanks once again
so if I regas the clutch would then operate satisfactorly

I also found a valve in the pipe that comes from the bottom of the a/c rad like a large tyre valve would this be were one would refill

 

[Blobcat]

If it is just that the gas has leaked out over time and there are no holes then a regas should suffice. I would recommend finding an independant AC specialist to do a vacuum test and regas. MB garages are not specialists at this and do charge heavily.

 

[panason1c]

I have only owned the motor for one week

Any help will be appreciated

My previous post was based on the above......As Kebo has only owned the car for a week i assume that the A/C didnt work when he took possesion and probably doesnt know the history regarding whether the possible loss of gas was sudden or over a long period of time and therefore, in my opinion, is best going to see an A/C specialist for a full evaluation of the system.

 

[Blobcat]

Agreed, I would be knocking on the supplying dealers door quite hard.

 

[television]

If it is just that the gas has leaked out over time and there are no holes then a regas should suffice. I would recommend finding an independant AC specialist to do a vacuum test and regas. MB garages are not specialists at this and do charge heavily.

Not so, once the system is no longer under pressure air does get in where the gas came out,as the seals are of the self expanding type and parcially collapse been there and had it. A specialist is the only way.

Malcolm