Moz replied:

G'day Chats,
Sounds like your theory could be right.
The problem is probably with the thermostat.
If it is, then it could be a bit of a job to replace.
Is it under warranty? A dealer should be able sort it out.
The thermostat usually sit under the dash mounted on to the
A/C unit and a sensor wire runs in inside the unit and sits against
the evapourator. If it is not situated correctly or if the t/stat has failed
electrically then it will need to be replaced which may requires the dash
to be removed to access the A/C unit.
As I said it's a job to do.

Cheers Moz

herkman replied:

yes I suspect that too, what is happening is the system just keeps pumping the cold air, until it freezes up. When you stop the ice melts and off you again, until the whole cycle starts again.

So the dealer says he cannot duplicate the fault, try and freeze it up for when you get there. Whilst water coming from the drain is normal, large amounts indicate the unit is freezing up.

Regards

Col Tigwell

Member - Wim (Qld) replied:

chatsbury.

Problem may also be short on gas. Check sight glass for bubbles.

Regards

Member - Duncan W (WA) replied:

Try here, we Terracan owners have a forum at:
www.terracan.australia4wd.com

pretty sure climate control in the Highlander's been discussed. I have the base model so can't help otherwise.

Cheers

Dunc