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R32 Air Con - Blowing Warm Are If Set Higher Then 18

Dubz

By Dubz,
in General Maintenance

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Dubz Newbie

Dubz

Posted
Posted

As per the Topic my aircon blows hot air if its set any higher then 18.

i've ran diagnostics on it.

It reported that the there was a short with the refrigerant temp sensor (-27)

But when i read the i got the following readings from the sensors 5 > 25 > 26 > 20 >46 (this being the refrigerant sensor)

Where can i locate the sensor to see if it needs the terminals cleaned or something.

Any solutions or anyone come accross this before, what did you do to resolve it?

wlspn Proficient

wlspn

Posted
Posted

Does this also happen with your fan?

Mine blows warm air even with the unit entirely off!

Hard to explain but there is a flap, controlled by an actuator (motor), which when open allows air through the heater core (warming it up) & when shut diverts the air straight out the vents bypassing the heater core. This is how you get hot or cold air...

Think my (& your) actuator is stuffed.

In my case I have to have fan on with temp set to FC (by holding down cold when at 18deg) to have anything but warm air. Bit of a pain...

Haven't looked into it much yet but worst case would be a second-hand unit from a wreckers or the original could possibly even be fixed.

Let me know what you end up doing.

Dubz Newbie

Dubz

Posted
  • Author
Posted

In my case I have to have fan on with temp set to FC (by holding down cold when at 18deg) to have anything but warm air.

I had to do this last night if it wasnt on FC it would start blowing warm air... not going to be that much of a pain with winter coming up.

An Air con specialist should be able to sort this out?

89CAL Grand Master

89CAL

Posted
Posted

As per the Topic my aircon blows hot air if its set any higher then 18.

i've ran diagnostics on it.

It reported that the there was a short with the refrigerant temp sensor (-27)

But when i read the i got the following readings from the sensors 5 > 25 > 26 > 20 >46 (this being the refrigerant sensor)

Where can i locate the sensor to see if it needs the terminals cleaned or something.

Any solutions or anyone come accross this before, what did you do to resolve it?

If your air con is cold on 18 but warm on all other temperatures then it is most likely the sensor behind the dash on the left hand side of the steering wheel (It is on 33's pretty sure same spot on 32's)

Its a little grille, couple of slots if you would like to call that.

Sometimes if you pull the dash off and put it back on you can forget to plug the sensor or the hose back on. If you pull the dash out you will see what I'm talking about. there should be a hose (just a rubber thin hose, it shouldnt be hard should be nice and soft) and a plug that goes into a sensor, the sensor is around where the hose plugs in on your dash, you should see the place where the hose plugs in

See if that helps

fib Community Regular

fib

Posted
Posted

Mine does a similar thing. 18 and it's cold, any other temp and this motor behind the dash kicks in intermittently blowing warm/cold air. It's so annoying. Also that sensor behind the dash I have also seen whilst fiddling behind the dash hehe

89CAL Grand Master

89CAL

Posted
Posted

air blend door still has to work dependant on the set temperature and actual temperature

If the air con is set at 25 degrees and its 10 degrees then you dont want your air con to blow cool air do you?

The auto mode only adjusts the fan

You set the temperature on the climate control, climate control looks at inside temp, opens air blend door (hot/cold air mix) to output a temperature in relation to the inside temperature

E.g. Inside temp 10 Degrees, Set temp 25 degrees, warmer air will blow

Inside temp 30 degrees, set temp 25 degrees, cold air will blow

With the sensor disconnected the climate control assumes the minimum value for the sensor, therefore always produces hot air unless at 18 degrees celcius which is when the climate control assumes you want cold air. Just as at 32 degrees celcius it assumes you want hot air. Not sure about this for the R32's maybe they do this at FC and FH instead

Thats the end of my rant about air con, which I think is mostly right lol :)

GTRPowa Rising Star

GTRPowa

Posted
Posted

32 GTR's (dunno bout the rest) have that issue with the dry joins on the actuator. Search for the 'paper trick' - should be able to find the thread. This basically means whereever the air mix door was when the dry joint occured, it's stuck there till you fix, search for it, I had this problem.

32 GTR's (dunno bout the rest) also have the cabin air temp sensor directly behind the fascia that goes aorund the centre console (radio, climate, etc) - Remove the facia and check the sensor at the bottom right is plugged in, and the hose behind it is connected to it to draw air through it. Also had this problem.

Now my aircon rocks. But my clutch sucks. :<

Nee-san Grand Master

Nee-san

Posted
Posted

Mate, mine is hot no matter what i do, I will try FC but at the moment I am putting the Climate control back into the dash, the previous owner moved it to the glovebox for some wildly unknown f**king idea.

Nee-san Grand Master

Nee-san

Posted
Posted

Mine was "professionally moved"

They professionally cut holes in a 10mm MDF sheet with what one can only assume was a pair of scissors, and glued carpet to the front of it.

It also had HKS EVC and SCRAMBLE modules set up this way.

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