Question for Aircon Experts.

Submitted: Sunday, Mar 16, 2008 at 20:13
ThreadID: 55604 Views:1732 Replies:4 FollowUps:3
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Why would engine coolant be leaking out of air con drain, when air conditioner is on, and turned off???. It must be related to the heater core as far as the leak goes, but why does it occur when the air con in use?, Did not think air con had anything to do with engine coolant? Its a climate control system. And to keep you on the ball its not in a 4wd, ( Hydraulic Excavator) but i would think most systems work on the same principle no??. Would Apreciate someones ideas on this.

Cheers Axle.
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Reply By: Peter 2 - Sunday, Mar 16, 2008 at 20:25

Sunday, Mar 16, 2008 at 20:25
climate control systems usually run the foot level air a few degrees warmer than the face level vents. To do this they open the heater slightly, hence the leak from the heater core.
AnswerID: 292988

Follow Up By: Member - Axle - Sunday, Mar 16, 2008 at 20:41

Sunday, Mar 16, 2008 at 20:41
Thanks Peter, If i were to stop the coolant flow at the motor end, would this effect the air con, apart from that foot vent temp; just its a shocker to get the heater core out but do like the aircon.':)).

FollowupID: 558604

Follow Up By: Peter 2 - Sunday, Mar 16, 2008 at 20:49

Sunday, Mar 16, 2008 at 20:49
It will depend on the system itself. I had a similar problem with a car and when I stopped/disconnected the heater core the climate control sensed that the coolant wasn't hot (no flow through the heater) so wouldn't allow the fan onto high speed or face level, all the air went via the foot vents and it would never cool properly.
All you can do is try ;-))
FollowupID: 558605

Reply By: RustyHelen - Sunday, Mar 16, 2008 at 21:23

Sunday, Mar 16, 2008 at 21:23
Maybe it is condensation???
As you cool air you also dry it out and the water from the air has to go somewhere so it collects on the condensor and then drains. Often this happens in "bucket loads" once you stop the motor.
Worst we had was a hire vehicle in Darwin (a LC) that the drain pipe had disconnected above the passenger foot well and the water was inches deep until we returned it to have it fixed.
AnswerID: 293013

Follow Up By: Member No 1- Monday, Mar 17, 2008 at 08:16

Monday, Mar 17, 2008 at 08:16
condensate is pure water...looks nothing like coolant
FollowupID: 558683

Reply By: Member - Troll 81 (QLD) - Monday, Mar 17, 2008 at 09:39

Monday, Mar 17, 2008 at 09:39

I had a aircon leak roughly 8 weeks ago and the fluid that started dripping on the floor was green…first thing I thought was it was radiator coolant there was also a hissing coming from the front. After a couple of min the hissing stopped and the fluid stopped dripping. I turned the car on to get a clue and I immediately felt the hot air blowing. Took it into a aircon repaired and he said it’s very common for the oil inside the compressor to leak out when there is a leak and that’s the green color
AnswerID: 293067

Reply By: Member - Murray R (VIC) - Monday, Mar 17, 2008 at 22:13

Monday, Mar 17, 2008 at 22:13
If system has just been regased possible that it has a leaking evaporator .If system has dye in it [fluro green in colour], it will mix with evaporator condensation and leak out of drain tube If you have it regased regularly this is more than not the problem
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AnswerID: 293238

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