Question about 2007 Mercedes-Benz S-Class

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Compressor does not quick in when a/c is turned on

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Leak in a/c system,have leak fixed,replace receiver drier,have leak dye put in and system recharged

Posted on Aug 10, 2008

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Your R13 may be so low that the compressor does not kick on. This is a protective design becasue when the R13, which lubricates the compressor as well as cools it runs out the compressor will seize. Depenmding on the age of the car, add more refrigerant or have the system evacuated, pressure tested, repaired and refilled. A lot of times the evaporator leaks first

Posted on Jul 20, 2008

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1 Answer

Why does my ac compressor turn off and on quickly


It is low on refrigerant.
If ambient temperature is over 85F and your A/C fan is on HIGH, the compressor should cycle for no more than 2-3 minutes max before remaining on. If it does not, there is not enough refrigerant in the system to maintain low-side pressure, and the cycling switch is doing its job to prevent damage to the compressor.

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2006 scion xb ac not getting cold


The first thing that you would want to check is that the a/c compressor is coming on when the a/c inside is turned on. If the compressor is turning on and off really quickly then you are probably low on R-134A refrigerant for the a/c system and you will need to check for leaks.

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When idling the a/C compressor just kicks on for a few seconds then disengages


You need to add some refrigerant (R134). Whats happening is that since it is low on regrigerant the compressor sucks the low side below the cutt off pressure turning off the compressor, then pressure at the low side builds up again quickly and turns the compressor on again then sucks it back down again untill it turns off and the cycel goes on and on untill you add enough regrigerant in there. Here are some caution do not overcharge the system. Overcharging will make it not get cold properly and will damage the compressor costing you a lot more money. The low side should reach a minimum of 35 psi with the AC blower on maximum. This keeps the compressor on all the time. If say you were to put the blower on minimum the evaporator would get really cold since the air passing through it is less. This would cause the low side pressure to dip down gradually until the compressor cuts off, and that is how the system basically works

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1 Answer

Where is low side of a/c system to cahrge with 134


The low pressure side of the r134a system is always located on the thicker pipes vs. the thinner pipes leading away from the compressor.

So, just followi the larger diameter piping from the compressor until you come to a quick connect fitting that attaches to the hose quick connector that is attached to a can of r134a.

The pressure reading should be 25 psi to 45 psi on the low side when the compressor is turning and the a/c is on.

If it's higher than this, the compressor may not be turning, and the normal non turning psi is 75psi to 100 psi or so on a hot day.

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A/c Compressor turns off and on but not cooling


Heater valve or door might be stuck open allowing hot air to mix with cold.

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Broken Serpentine belt. Traced problem to air compressor. The pulley will not turn. Is this a seized compressor? Can I remove the compressor without removing the power steering. Is there a quick solution.


Sometimes you can route the belt the same as one with no air. your parts dealer may have a belt route if yours is missing from the car. sometimes you need to put an idler where the compressor is. Don't run the car without the belt. Even if you put a used compressor on without charging the system, you need the belt for the water pump.

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1 Answer

I can hear my compressor


Sounds like a compressor going bad, there is no quick fix, if it is indeed going bad, it must be replaced, and this can be expensive. Find a reliable air condition tech, and have it checked out.

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