Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[al brown]

Had the air con charged today, no leaks but it doesn't blow cold. When you set it to auto the compressor turns on and the passenger side fan on the front of the rad turns on but the pipe with the lp valve get hot not cold and there is no cold air. Is there anything obvious or will it need an expensive session with a specialist.
Cheers

[Kevin Wood]

Whoever charged it should have been able to diagnose it a bit better than that, TBH. They should have been able to watch the hi and lo side pressures and determine what is going on.

If there are no leaks, it was charged correctly and the compressor is spinning, I would guess either the compressor has died or the expansion valve is blocked. There isn't really much else to go wrong.

Oh, and both front fans should be running at a slow speed with the AC on. Has one of the motors siezed or got a bit stiff?

[al brown]

Will check the fan as drivers side doesn't run. Ac compressor turns constantly with ac on, is it doesn't cycle on and off. LP is 35ish and HP is 100 both with ac on. I thought HP should be more than that out an I wrong?
Al

[sassanach]

35psi low side is normal,i would expect to see 150 psi high side

[kevinp58]

Just a thought have you set the temp to low. 

[al brown]

Temp is set to low, but the lp pipe gets hot not cold.
I was expecting the high side to be higher than 100, I am sure the wife's focus was about 140. will see if I can find someone else to top it up again. At least there was no charge today as it was not cold.
Or will a top up kit get it from 100 to 150 psi as I now know the system has no leaks?

[dbug]

Temp is set to low, but the lp pipe gets hot not cold.
I was expecting the high side to be higher than 100, I am sure the wife's focus was about 140. will see if I can find someone else to top it up again. At least there was no charge today as it was not cold.
Or will a top up kit get it from 100 to 150 psi as I now know the system has no leaks?

Shouldn't - these are krap

[al brown]

Temp is set to low, but the lp pipe gets hot not cold.
I was expecting the high side to be higher than 100, I am sure the wife's focus was about 140. will see if I can find someone else to top it up again. At least there was no charge today as it was not cold.
Or will a top up kit get it from 100 to 150 psi as I now know the system has no leaks?

Shouldn't - these are krap

Yeah figured that was the case. Just got the car back on the road and we are of on holiday in it on Sunday so would like it working. Will see if there is anyone else local who does air con. Garage I used today are not specialists but it's an automated machine so I figured it would be fine. But from the info from sassanach it seems the pressure is low on the high side and as I fitted a new compressor a couple of years ago I would hope that is fine and it is just a low charge from the garage.

[sassanach]

Temp is set to low, but the lp pipe gets hot not cold.
I was expecting the high side to be higher than 100, I am sure the wife's focus was about 140. will see if I can find someone else to top it up again. At least there was no charge today as it was not cold.
Or will a top up kit get it from 100 to 150 psi as I now know the system has no leaks?

Shouldn't - these are krap

Yeah figured that was the case. Just got the car back on the road and we are of on holiday in it on Sunday so would like it working. Will see if there is anyone else local who does air con. Garage I used today are not specialists but it's an automated machine so I figured it would be fine. But from the info from sassanach it seems the pressure is low on the high side and as I fitted a new compressor a couple of years ago I would hope that is fine and it is just a low charge from the garage.

low charge I suspect,i've done loads of ac systems where  a vacuum check is perfect and then it leaks under pressure.after all a vacuum check is minus 15 psi but ive seen high side pressures in excess of 350 psi(usually when the condenser fan fails)

[al brown]

Temp is set to low, but the lp pipe gets hot not cold.
I was expecting the high side to be higher than 100, I am sure the wife's focus was about 140. will see if I can find someone else to top it up again. At least there was no charge today as it was not cold.
Or will a top up kit get it from 100 to 150 psi as I now know the system has no leaks?

Shouldn't - these are krap

Yeah figured that was the case. Just got the car back on the road and we are of on holiday in it on Sunday so would like it working. Will see if there is anyone else local who does air con. Garage I used today are not specialists but it's an automated machine so I figured it would be fine. But from the info from sassanach it seems the pressure is low on the high side and as I fitted a new compressor a couple of years ago I would hope that is fine and it is just a low charge from the garage.

low charge I suspect,i've done loads of ac systems where  a vacuum check is perfect and then it leaks under pressure.after all a vacuum check is minus 15 psi but ive seen high side pressures in excess of 350 psi(usually when the condenser fan fails)

Cheers, will see if I can get it charged correctly, hopefully it isn't leaking, they said it didn't blow child at any point. Was trying to help out local small business, maybe should not have. Don't get how a machine can get it wrong tho.

[biggriffin]

Had the air con charged today, no leaks but it doesn't blow cold. When you set it to auto the compressor turns on and the passenger side fan on the front of the rad turns on but the pipe with the lp valve get hot not cold and there is no cold air. Is there anything obvious or will it need an expensive session with a specialist.
Cheers

when you say turns, that is the whole of the pulley,including the inner part, also check fuses and last check is the HP shut off valve,which is on the pipe in front of the commpressor,got a wire going to it,yours might have two valvesl

[al brown]

Had the air con charged today, no leaks but it doesn't blow cold. When you set it to auto the compressor turns on and the passenger side fan on the front of the rad turns on but the pipe with the lp valve get hot not cold and there is no cold air. Is there anything obvious or will it need an expensive session with a specialist.
Cheers

when you say turns, that is the whole of the pulley,including the inner part, also check fuses and last check is the HP shut off valve,which is on the pipe in front of the commpressor,got a wire going to it,yours might have two valvesl

Compressor works as it should, well it is giving 100 psi anyway. Will check for a second valve in front of the compressor but from what others have said it seems like as low charge had been put in. An only in a rush about it as we go away tomorrow and it would have been nice to get it running, but I don't think I can get it in anywhere today.

[sassanach]

take it to  kwik sh*t,they have automatic machines as well.and they do not charge for failure.

[al brown]

Just been back to the garage to get the pressure checked, lp oscillates (every second) between 33 & 36 and HP was fairly steady at 90. Garage said the machine is set to the car and should give the correct amount of charge. Only thing they could do is set the vacuum for longer as the machine does it all for them they can't set the pressure. But they think it is a mechanical problem.
Al

[sassanach]

how much did the machine put in?(in theory)