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Hot air in cabin fix

Alan

G-Wagen Club SA
Joined
Oct 12, 2008
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56
Location
Pretoria
#1
So after yet another near murderous trip whereby the bottom vents are constantly blowing hot air onto my legs and feet and I still haven't looked at the problem, today was the day.
During the current heat wave it seemed even worse an even the aircon could not cope. After a game drive in another "G" ( a Toyota Landcruiser HJ61 G) driving with open windows it was more comfortable than me driving with aircon. That was the final straw and before the Angola trip this had to be fixed. Actually I did not realize it was that bad until driving in the other vehicle.
So my first guess was that the heater valve does not close off anymore. Knowing it sits behind the dash in a very awkward place I was not keen to do this job, but it had to be done.
So this morning I pulled the G into the workshop, removed the steering wheel and some dash panes and started investigating. The first thing I picked up was that the valve is not fully closed even though the lever is on the closed position. So I removed the clip securing the sleeve and pulled the sleeve back an refitted the clip. It was better but not yet completely closed.
So, I had to remove the center console to get the the back of the actuator levers to hopefully do the same trick there. Well, I was lucky and I could adjust that end as well. So I started the engin and let it get up to operating temp and felt what air was coming out. It was cool, opened the heater valve and it obviously started to get HOT again. Closed the valve and after some time it was again cool.
Now I also switched on the aircon and I could not believe it actually blows cold air out the bottom vents. This was something I was no expecting as I always thought the aircon only blows out cold air from the console vents.

So, hope this could help someone else. I am a very happy camper.
 

Antony

G-Wagen Club SA
Joined
Nov 17, 2008
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Johannesburg
#2
Nicely done Alan. I simply thought that hot air on the feet was a feature of all G’s. Luckily my 290 seems to be able to blow cold air on my feet, but unless I have the aircon on, my side vents blow hot. Do you think the heater valve could be a cause of that as well?
 

Andrew

G-Wagen Club SA
Joined
Oct 8, 2008
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Brits
#3
Nicely done Alan. I simply thought that hot air on the feet was a feature of all G’s. Luckily my 290 seems to be able to blow cold air on my feet, but unless I have the aircon on, my side vents blow hot. Do you think the heater valve could be a cause of that as well?
Yes Anthony, it is the valve but - oh joy - it is behind the engine on the cabin air intake not in the dash!
Try removing it and soaking it in vinegar before replacing it - and when replacing the 123 and 124 unit works just fine.
 

Alan

G-Wagen Club SA
Joined
Oct 12, 2008
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Age
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Location
Pretoria
#4
Antony, as Andrew said YES I think it is the root of all evil hot air. I would disconnect the actuator wire first and see if you can manually close it more. If yes you can try adjusting it sio it closes from the dash slider.
 

Dikfrik

G-Wagen Club SA
Joined
Oct 10, 2008
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Location
Empangeni, Zululand
#5
Well done Alan! I wanted to ask since my valve seems to sit engine bay but Andrew confirmed it thanks
Mine has not been problematic for long but on my recent travels I fully opened the heater to try and get coolant temps down on a long climb in Transkei and it took a long time and many open and close cycles before it got better.