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Problem with airconditioning on 155 2.0 16v super
Hi there!
I need a little help with my car. the aircon is not working the way it should. The problem is: Starting the engine with the aircon turned on, the pipe leading away from the compressor gets cold quite fast but just for a few seconds. Then there is a clicking sound (relais i guess) and the pipe gets warm. While driving with revs about 2500 and speed around 50 km/h the air reaching the passenger compartment is as cold as it should be with aircon turned on. When stopping at a light for more then a minute or so: there is the "Click" and the air comming in gets warmer and ..uh.. humidity rises fast as well.. and the smell...bah.. Driving again and all gets back to normal function. What i checked and did until now: - The passenger compartment filter is new, been in for two months. - The r134 level is checked and 750 grams of it are where they are supposed to be. - System has no leaks - Yesterday i found a resistor which had been blown (notice: fuses are all ok) the resistor is next to the cooling fan and a mec told me that the resistor is needed for switching the fan from level one to level to. Weird thing about how that thing died: one of the two cables was melted(!) as well as a part of the plastic housing. The insulation of the cable has nice little bubbles at a length of ca. 5 cm. That heat didnīt come from anywhere else but the resistor. - I was given the hint to change the dryer/filter(?) of the aircon (aluminium housing, two high pressure connections) to make sure the system runs all right. It might help. Damn expensive part though.(about 100 euros) - one of the little valves at the tubes near the compressor was leaky, throwing out a few small bubbles (normal tire valve) and was changed. Maybe that was an inication that something was choked and the pressure inside the system is too high. I really hope someone can help me or give me a few hints which other parts i could check and how. Thanks in advance, Ralf |
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#2
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Ralf Hocke skrev i meddelandet >... [snip] >- Yesterday i found a resistor which had been blown (notice: fuses are all ok) > the resistor is next to the cooling fan and a mec told me that the resistor > is needed for switching the fan from level one to level to. Weird thing about > how that thing died: one of the two cables was melted(!) as well as a part of > the plastic housing. The insulation of the cable has nice little bubbles at a > length of ca. 5 cm. That heat didnīt come from anywhere else but the > resistor. > The cooling fan has two speeds. The resistor is used for the low speed mode. If it is broken, the engine temp will rise a bit higher before the fan cuts in, close to 100 C and then the fan will run at full speed. This could possibly affect the operation of the AC. Either way, it's a rather easy fix and it's probably good for the engine to have the low speed so I think you should start by fixing this resistor. /Henrik |
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