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[Webby the Bear]

Hi guys,

I often have my air on ECO (thus A/C off). The car idles at bang on 400rpm on ECO and jumps up to 600rpm when A/C on. However I switched ECO off the other day and there was no increase in revs.

I had a butchers at the A/C compressor whilst mummy bear activated and deactivated the A/C and I couldn't see the compressor spinning although I cant be 100% sure as visibility wasn't great.

Anyway, I got a pocket screwdriver and just quickly depressed the Schrader valve and there was a hissing but no spraying out of refrigerant so I'm thinking it's just low.

So, does this mean all I need is a refrigerant can?

[Webby the Bear]

ps, I know its not just ''dump a can in''... it needs to be vacuumed and then charged. 

[amba]

Compressor will not engage if low on refrigerant to save damaging the unit.

First thing to do is get an AC Engineer to investigate as several things need checking.

May just require a vac down and recharge which will identify any leaks and if all good quite cheap just for regas.Failiing that ist the bottom less pit with evaporator /dryer leaking or worse still compressor .

Just had mind done and we found the valve hidden up under the glove box wasnt releasing correctly so had that replaced.Job from hell getting at it and then putting all back together .

Fingers crossed it just needs a recharge.........Avoid Shit-Fit though IMHO

[martin42]

This place got recommended on projectpuma,
http://www.bee-cool-aircon.co.uk/contact-us/

[Webby the Bear]

Thanks Amba.

We have evacuation/refill machine at school so i'll evacuate the system, vacuum it down and see if it holds pressure first.

as you say, hopefully it will just be a recharge 

[Webby the Bear]

thanks mate 

[Jimbob]

If you have the UV dye to add too, that should help pinpoint your leak

[Webby the Bear]

If you have the UV dye to add too, that should help pinpoint your leak

Thanks mate. Yeah will use this... i'll raid the school's cupboards 

[Webby the Bear]

ps is the omega system the R134A?

[05omegav6]

ps is the omega system the R134A?

Yup

[Webby the Bear]

ps is the omega system the R134A?

Yup

Sweet, cheers mate 

[biggriffin]

Webby be fore you regarge it.
 de-gas first, remove hp valve and clean with brake cleaner, remove and replace lp valve (its a std tyre valve),then nitrogen pressure test system, then remove the machine leaving the system under pressure, no hoses connected and check hp/lp for leaks (slight hissing),check condensor for leaks traces of dye,also around the compressor for dye, then refill with 930g of refrigerant and oil,the machine should do it for you ,

[Webby the Bear]

Thanks mate

TBH I was going to buy a set of manifold gauges and vacuum pump so I can do these repairs in future...same way of doing it... just need to measure out oil and refrigerant 

[Webby the Bear]

ps, if I was to use manifold gauge set and add via can.... can anyone recommend a product?

I'm thinking this if I can find a seller

http://www.ebay.com/itm/R134A-Polar-Ice-R134a-Refrigerant-14-oz-Refill-for-FJC-533-Standard-R134a-Top-/150977596205

[Entwood]

ps, if I was to use manifold gauge set and add via can.... can anyone recommend a product?

I'm thinking this if I can find a seller

http://www.ebay.com/itm/R134A-Polar-Ice-R134a-Refrigerant-14-oz-Refill-for-FJC-533-Standard-R134a-Top-/150977596205

IMHO such a purchase would be pointless ... 

The aircon system is designed to have a specific mass of refrigerant in it   .. 930 grams I think -  the ONLY way of ensuring the CORRECT amount is to empty it then add the calibrated amount.

Any other approach is simply a guess.. and as you don't know how much you start with .. how much are you going to add   1 can might overfill it, 2 cans might only 1/2 fill it .... 

and then the oil .. also requires a calibrated amount ... how do you do that ??

The machine that empties/vacs/refills the system is designed to measure all the amounts removed, and to then replace with the CORRECT amounts .. and that treatment is around £40 at most air con places .... so why waste money, and risk an even higher bill, by messing about with unknown cans ??