any body know anything about car air-con,it seems that when you press the air con button in on the car normally there was a click and the revs dropped,now i turn it on and it doesn@t click and the revs stay the same?

any1 got any ideas
its on a focus diesel

 

Compressor not engaging?

 

i tought that but where is the compressor? and what does it look like

 

Chances are, the gas has escaped. The pressure switch will have stopped the compressor from clicking in and out.

Take it to an air con centre and get the pressures chcked and re gas it if required.

 

was only re-gassed last week
i think its the compressor not working as it doesn't click and the revs drop when you turn it on

 

could be a blown fuse

 

theres a electro-magnetic clutch which makes it work, this will either be burnt out and not working, or fell off and be either in the under-tray or on the road somewhere.

Or you've got a broken wire/faulty switch/fuse blown or something..

 

checked all wires and fuses all seem to be ok
on the side of the what i presume to be the compressor i can turn the wheel with my hand?
does this mean it is fukkked
how much r they from fords?

or any body else help me out

 

you shouldn't be able to turn the wheel its belt driven

 

Yes you should be able to turn the centre of the wheel. The pulley that the belt runs on just free wheels unill the compressor clutch engages electrically.

Just because it was gassed last week doesn't mean that the gas hasn't leaked out. If it's got a leak, it can leak out in a few minutes, a few days or even a few weeks....

It could be that the pressure switch has failed or the clutch has gone open circuit or a wiring fault or it could be any sort of sensor. Even the old Escort non turbo diesel vans had sensors and diodes all over the place.

 

it was tested for leaks before they re-gassed it.
probably guessing its somethng to do with the compressor,will look like i will hve to pay a visit to the garage

cheers for all the reply's

 

They can only test it under vacuum unless the system was working before they re gassed it. Once you have 20 bar of pressure in the system, leaks that wern't there under vacuum will show their faces!

 

is there anything i can do to eliminate 1 thing at a time?
how can i test the switch?
can i test the compressor?

 

find the pressure switch, maybe 2/3 or 4 pins dependant on functions, short out a pair of pins, if its two pin the pins once shorted with the engine running will fire up the compressor clutch, if its a 4 pin two other pins will be for the cooling fans and two for the clutch

this will test the wiring all the way to the pressure switch, then to the compressor, leaving only the switch and gas content, more than liely still a leak tho pal if it worked last week

 

i'm an expert, but answering this would be like working on the weekend

some good advice on here so far

 

depending on age of focus you can get error codes up on the milage displya by holding the rest button and switch the igniton on or something, i'm pretty sure air con pressure switch will throw up a code if it's fubbered.

 

ITS A 02 reg
will try that soon
thanks

 

Check if the system was pressure tested with oxygen free nitrogen.This is the proper way to test for leaks on any ac system. The system should be vacced out prior to re-gassing the system.If it was re-gassed last week,take it back and let them do the head scratching.A properly tested system should not lose it's gas within 1 week.
Garry,(ac engineer).

 

I had my air-con gassed one weak, and it didn't work the next, was leaking on a union going to the Air/con condenser, me and my mate put a coloured dye in it, then we used special glasses and a ultra-violet gun, thats how we found mine, the gas escaping stopped the compressor from kicking in, which it will do if the pressure regulator can see there's no pressure in the system.

 

my fiesta is much the same . switch the air con on and nothing happens. I took it to get the gas checked, no problems there. The guy reckoned it was probably an electrical fault. The fuse for the system is ok , though not sur where else on the system to check