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[feeutfo]

i think it gets to much damp  in the dryer, have heard this can cause the silicon chrystals to degrade and block the ac pipes! Is this correct, anybody? Dryer is beer can size canister in front of the radiator/condensor, i would be changing that i think, others will confirm. Hope helps.

[vrba]

just to inform you all problem with radiator fans is solved after many months.
the problem was in hi pressure switch.

thx all of you for giving any clue's and answers

now i'm a little bit happier

just few more problems to sort it out and i will have a CAR

[Big_Roger]

Hi Stjepan,

Very pleased to hear you have at last found the problem with your radiator fans.

Re your query about having AC system open to air.

First, the oil in the compressor is not oil as we know it, it is a Poly Alkyd Glycol fluid lubricant, PAG for short. It is very hygroscopic, that is it absorbs moisture very easily from the air. This spoils it's lubricating properties, turning it into an emulsion much like the "mayo" you get in normal engine oil if water gets in that. It also makes it acidic so it attacks the metals in the system.

Second, in the system there is a filter dryer unit. This has hygroscopic crystals in it, and its job is to extract and hold any small amounts of moisture that may get into the system. If the system is open to air for very long these crystals will become saturated and spoilt so that a normal vacuum dry out will not work, and the canister will need replacement.

Third, If having been open to air, and the filter drier is not replaced, and an extended vacuum not done to dry the system to remove all the air, and the remaining contaminated PAG, and it is just filled with R134a, then all the acidic mixture with water and oxygen circulating will soon ruin all the moving parts and rot the system. Also as the mix goes into the gaseous stage in the evaporator, the moisture will freeze and block the system. This will cause the low pressure to trip until it thaws out and this cycle wil continue until the low pressure switch fails.

Before you use the air con system, have it checked out by specialist to be vacuumed for extended time and old oil out and fresh oil in and 950 grammes R134a put in.

Roger