Air con pressure switches

[longhair]

Hi everyone
Just wondering if anyone knows where the pressure switches are on a mk1 custom are located. The air con has stopped working for some.reason I had it pressure tested and have been told it's Fine. So I thought I would test the plugs at the switches first before looking for other reasons.

[metalworker0]

you need to give a more detailed post than saying "not working"

like is it ..not working ..as in one of the flaps not opening , as in blend door actuator --- some of these are driven by tiny motors and gerarboxes and common for them to strip plastic gears... usually you hear lots of clicking sounds

or is it not working because the refrigerant has emptied or the pump has failed or internal stat has failed

i may not be able to answer but others will get strait to the point .

see your messages



all the best.mark

[longhair]

The compressor clutch is not engaging when I press the air con button. It's been nice and cold, not gradually losing it's chill like it's losing pressure over time. I have checked the fuses and they are fine. I'm going to start looking at the pressure switches and check the voltage going to the compressor tomorrow for a start.

[metalworker0]

Refrigerant -- one of the first checks you can do is check the schrader valves are not leaking, that's if it has florescent die in the system, you can take off the fill caps (high side and low side)and look at the valves with a "black light" ..and see the die fluoresce on the top of the valves ..you can also look at the front the evaporator ,..the radiator thing up front ..and see leaks there with the black light. refrigerant is enormously expensive these days ..especially in the last few years they have been filled with something called R32.... Needs checking out, the year etc they switched over..before you decide to commit your dosh to it .

all the best.mark

[Altransit]

Check that the aircon fan is engaging, the compressor wont run unless the fan is turning

Failing that, if the gas is fine, I would suspect the compressor, I've had two on my Transit, and three on one of the Focus's, so they're not very rugged!

[longhair]

How do I test the Aircon fan? Is it the engine fan but with another loom connection rather than the engine one that comes on when the engine requires it to, or is it just a case of putting a 12v feed to the.fan.

[metalworker0]

The air con fan should come on as soon as the air con is switched on... and stay on for as long as the air con is switched on .

all the best.mark

[longhair]

Yes I understand that, but as my van only has one fan, I presume it doubles up as the Air con fan as well. Also I know it should come when you press the Air con switch but if it isn't getting the power from the switch for some reason, the fan would need a external power to it to see the fault might be with the fan itself or something else.

[metalworker0]

So that means ..from just looking ..you have a 2.2, as the 2.0 has two fans

And ive no idea how the fan is set up ..may have a relay or fuse for each function, meaning duplicated relay and fuse for AC and normal cooling

Suggest start diagnosing relays by swapping ..and testing fuses with a multimeter.

Your "owners manual" has all the fuse and relay designations in it .

online

edit - 2.0 ecoblue manual

https://www.manuals.co.uk/ford/transit- ... nual?p=143

This is the first page - scroll across with arrow for all proceeding pages, about 10 covering the fuses and relays.

i did notice, there is an AC clutch fuse listed

all the best.mark

[metalworker0]

WRONG MANUAL LINKED -- you want one before 2015

[metalworker0]

2.2 owners manual
https://www.fordservicecontent.com/Ford ... 133110.pdf

pages 232 fuse box locations

256 fuse and relay designations

all the best.mark

[Altransit]

Yes I understand that, but as my van only has one fan, I presume it doubles up as the Air con fan as well. Also I know it should come when you press the Air con switch but if it isn't getting the power from the switch for some reason, the fan would need a external power to it to see the fault might be with the fan itself or something else.

Yes, mine has only the one fan, same as yours. I was told by one garage that someone must have removed the smaller one (which my Mk6 had) and that was the reason that the A/C wasn't working (turned out to be the compressor) but I tested the fan by applying a direct (fused) feed to the fan controller on the back of the radiator cowling. If it still doesn't turn, with a 12v feed, then the fan controller could also be suspect, (I had a dud one of those on the Focus too!).

[longhair]

Thanks for all the info. I'll Investigate and what I can see if I can find the problem. I'll let you know how I get on.

[Altransit]

Thanks for all the info. I'll Investigate and what I can see if I can find the problem. I'll let you know how I get on.

Yes, please do

At least you're not looking for gas leaks, as that's another whole new world of PITA

[longhair]

Right, I have finally got round to looking for possible reasons it isn't working, and to be honest I don't know what to do. I had a look at seeing if I could get the engine fan to work by putting a 12v feed to it but there is two plugs going to it for some reason and I'm not sure which one I need to disconnect to put the feed to. I think I might have bite the bullet and take somewhere and get it looked at.