AMBIENT TEMPERATURE (CELCIUS) | R134a PRESSURE (PSI) |
0 | 30 |
10 | 45 |
15 | 55 |
20 | 70 |
25 | 80 |
30 | 100 |
35 | 115 |
40 | 130 |
AIR TEMP (C) | RED GAUGE (PSI) | BLUE GAUGE (PSI) |
0 | 40-50 | 20-30 |
10 | 50-100 | 20-30 |
20 | 100-150 | 20-30 |
30 | 150-200 | 25-35 |
40 | 180-225 | 25-35 |
is indeed 2 pinI've had a brief look at the parts catalogue, there are two options, a two-pin switch and a three-pin sensor, most likely yours is a two-pin switch. Now, the odd thing is that the switch has the following characteristics - opens at 3.04bar, closes at 1.67bar. So bridging out the switch would send a 'low pressure' signal not an 'OK pressure' signal - there is a discrepancy there to what you're being told, TBH, I'd cut my losses and go elsewhere.
When you purge it with an inert gas the switch can be testedhow would you test a pressure switch? they bypassed it and the a/c worked so kinda suggested it was that
That's correct - Ford original part number is 1016565 or 2051323, engineering numbers are 95BW19E561AA or F6RZ19E561AA for a Focus Mk1 (and a lot of other Fords). I suppose it's possible the specification could have the pressures transposed but If that was the case, someone should've noticed it by now...is indeed 2 pin
so in other words its usually open /good when all is ok , then becomes closed if low pressure? and bridging the wiring shouldnt fix it?
Kind of where I was coming from in post #14starting to think theyre a waste of space
had my gas leaked out weeks ago , then they cracked or fitted a monkey sensor and didnt realise because theres no gas , then today decide to put the machine on it
and the whole reason bridging the switch made it kick in was there was no gas and the switch was okay all along
So.. you were there - they found a problem their faulty part had caused - what are they going to do about it?right
after a 2 week wait to be seen again ....we tried the gas machine and its leaking bad from the new sensor area , blaming the non genuine sensor and o ring now
Whatever you do for a living, I'm sure there's variable quality there too.
Technicians
I'm intrigued now, are they saying they changed the switch without having to recover the refrigerant? because that's how it reads... If so, they really shouldn't be working on HVAC systems as they're clearly not competent, and probably don't have the required FGas certification for refrigerant handling, let alone any diagnostic skills.starting to think theyre a waste of space
had my gas leaked out weeks ago , then they cracked or fitted a monkey sensor and didnt realise because theres no gas , then today decide to put the machine on it
and the whole reason bridging the switch made it kick in was there was no gas and the switch was okay all along