Thread: Air con blowing hot and cold

They cut out when pressure is out of range due to heat build up, You may have a primary problem there. Have the electric fans died?

Or it is bordering on being out of gas ... Suggest you get it serviced

Thanks for your input.
What "primary" are you referring to? I'm no expert.
The electric fans have a habit of staying on even after I switch off the engine completely ... have not checked whther they still do that, will go do that in the morning.
But wouldn't the air flow at highway speed (about 100km/h) be more than anything the fans could generate?

re the gas, it is plenty cold ... when it works, which is actually most of the time.
Just checked the electric fans, both run when AC on, both stop when AC off, although one stops faster than the other.

I'm fairly sure its carking out for pressure reasons by your discription. Getting To hot due to air flow or cooling system not 100% viscous fan etc, AS Mike suggested gas may be low. Evaporater may be freezing up but I doubt that one.

I'm not an air con gurus but have been known to make old ones on unregistered farm machines work on LPG
The above are the main reasons most play up. Further more will be blockages from rust flakes etc. If you have it checked out you may be up for a new drier, TX valve and re gas at a minimum.

When it stops working does the compressor keep running and pressurized pipe get real hot or does the compressor rattle.

No noticeable compressor rattle but can't tell if running or pipe hot since I did not stop to check, just wanted to get home.
Just ran it at idle for 10 minutes short while ago, no undue noises, all seems well.
Was told it may be stome valve sticking, but that's just another guess.
Will definitely take to AC doctor soon.

Let us know the out come as I'm still learning off others experiences. I'm still banking on a heat related problem at this stage though.


Good luck with it.

Tony