Help! water dripping under the car when heater is on. (1 Viewer)

[feveryaya]

Hi, all. Sorry English is not my native tongue. Please forgive me if I don't say it clearly.

Long story short, my LX 570 had the heat valley leak problem, and It has been parking in my garage for about 2 months. Today I fixed the leak, but after I started the car, and turned the heater on to bleed the air in the coolant system, I found lots of water dripping under the car. It seems the water came from somewhere above the transmission.

I am very positive it's plain water, not coolant or engine oil, and I don't think heater could do that. Is it possible I broke something when fixing the car?

Please help and thanks again.

 

[tbisaacs]

There are coolant lines and a manifold that run to the transmission. Are you absolutely sure it’s not coolant? When doing the valley plate fix is it possible that coolant was diluted with water?

 

[bloc]

The AC evaporator drain drops clean water right onto the transmission. While we might assume it wouldn’t run the AC while the heat is on, it is totally possible the auto AC wants to dry the air as well, which will mean condensate (clean water) may be produced.

What you are seeing is normal operation.

 

[sdnative]

The cool box, and I believe the window defroster (at least initially when selected, can be turned off) will run the AC compressor regardless of temperature setting. Most likely condensate you are seeing. Can you smell/taste it to see if it's just water?

 

[feveryaya]

There are coolant lines and a manifold that run to the transmission. Are you absolutely sure it’s not coolant? When doing the valley plate fix is it possible that coolant was diluted with water?

Thanks for your reply. If it were heat valley leaking, the coolant should go down from the front of the transmission, but what I see is water dripping down from above the transmission oil pan.

 

[feveryaya]

The AC evaporator drain drops clean water right onto the transmission. While we might assume it wouldn’t run the AC while the heat is on, it is totally possible the auto AC wants to dry the air as well, which will mean condensate (clean water) may be produced.

What you are seeing is normal operation.

What I did is setting the temp to high in auto mode, the ice box is not on. Even so, the AC is still running?

I shot a footage here


Is is normal the water drains so fast? Thanks.

 

[feveryaya]

The cool box, and I believe the window defroster (at least initially when selected, can be turned off) will run the AC compressor regardless of temperature setting. Most likely condensate you are seeing. Can you smell/taste it to see if it's just water?

Yes, it's water. Can you please help me look at the video footage I just filmed? Is it completely normal? Thanks.

 

[KLF]

It would be normal IF the AC compressor is running. There's no way we can see this.

 

[AZLX570]

Turn off the A/C button (compressor) manually. To do this, you will need to take it off Auto mode.

Repeat and check and see if problem is still there.

 

[bloc]

Look at the AC compressor with the engine running. If the clutch/front face of it is rotating, you will get clear water out of the evap drain.

Yes it can be a lot depending on how humid the air inside the vehicle is.

There really isn’t anything else this could be to drain clear water in that location.

 

[feveryaya]

Thanks everybody. I believe it's the condensation water from the AC. I will check again.