MKIV Climate

[Stan 24v 0]

I know this probably should have gone in the general section, but I reckon I'll get a better respnse in here, and it may help those with climate in their C's :wink: So please dont move it mods :thumb right:

 

Anyway, The fans on my climate dont blow very fast. They blow hot/cold as required but the power is really low. The most powerful is when I switch it on to the screen, but any other setting is just really poor.

 

The aircon needs regassing, but Im not sure it should affect it as if its placed on econ then the aircon side should make a difference.

 

Anyone know what could be the cause?

 

Thanks

Stan

[tonedef 9]

........... and it may help those with climate in their C's.........

That's quite a large proportion then :lol:

 

I know for a fact that my fan worked fine when first installed even before I had it gassed up, all I could see the refrigerant pressure switch doing at the time was inhibiting the compressor. Of course mine's an earlier version of climate control, may have something to do with it?

[junkie 0]

Im not fully clued up on car A/C but the refrigerant pressure switch should be a safety device either low pressure or high pressure switches to prevent as you say the compressor running, so its protecring the compressor from failing.

 

How do you know it needs re gassing if its blowing hot or cold?

Is it cooling but only just?

 

On our Mazda 3 courtesy car when its put onto the screen it automatically blows really fast and automatically puts the air con into dehumidify mode and does what it needs to do depending on outside air temp.

[Stan 24v 0]

It doesnt go cold, thats why it needs gassing, well at least I think so anyway. So, do you reckon if I got it gassed then it may be hunky dory again?

[junkie 0]

It was just your original post saying it blows cold and hot that caused me some confusion.

 

So it will blow warm but presumably just like any other car does without air con/climate.

 

Well i would def get it re gassed 1st, as with office A/C type splits, depending on how sophisticated (read expensive) they are, the PCB control will slow the fan speed as to try and compensate for the loss in capacity in cooling or heating, also when you 1st start the car the air con should time out for maybe a minute say with the fan speed lower then once the compressor kicks in the fan sped raises depending on how much demand there is all by your set point, so the colder you set it the more demand there is, and vice versa for heating. So if the compressor is tripping on the low pressure switch, which it would do when its short of gas then the fan speed my not be raising. Also on heating the fan speed should be slower.

 

All this is based on A/C split systems and as i say i have no experience working on car air con.

[Stan 24v 0]

That sounds like it could be the cause mate. I'll get it regassed next month and see how it goes from there, providing I dont have a bloody leak too!!!

 

Cheers :wink:

[junkie 0]

All been well you wont have a leak, the most common cause for the gas leaking out is the gas molecules are smaller than the molecular structure of the pipes, all thats required to prevent it happening is to turn the air con system on and let it run for 5-10 minutes once a month minimum so the oil in the system seals the pipes up internally.

[Stan 24v 0]

Right mate, got it charged today at Kwik Fit (£35 bargain) and they said there was zero pressure to start with, which I expected, but that they couldnt debug the system as the compressor wasnt kicking in. Ive just done a vag-com scan, only got one fault which relates to Air Flow Flap Positioning Motor, Code 01274.

 

I also discovered that whilst switching to Basic Settings, the fans actually worked at full power, whereas normally they dont, they seem under powered all of the time.

 

Any ideas??????

[junkie 0]

If the compressor doesnt run then i presume they weighed the gas charge in hoping to get the compressor off its pressure switch if it has 1 fitted and that is a bargain.

 

Well obviously something is holding them off full speed but as to what i have no idea mate, as i say i have never looked into car A/C what so ever, the basic principles are the same as any other A/C and refrigeration but its all about the different controls that the systems utilise and unfortunately i have no idea what controls are in a cars A/C.

 

When you say basic settings what do you mean, is it like a test run kind of idea as usually when doing that it will override all the safety features and settings and just run basically at full regardless if you can change the settings ie: temp, fan speed airflow direction.

So my theory is that it is sensing the fault and coincidentally regarding airflow so as a safety feature again its holding it off slightly as to prevent damage, so obviously on test its overriding everything and apparently working ok.

[Supercharged 2]

Stan, i'm no expert but it's usually the relays that fail with MK4 aircon...