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| 460 - No hot or cold air - what's wrong? Looking at a G for sale. 300GD with A/C. Heater fan works but only blows in outside air. No cold air when set to AC full, and no heat when set to heater setting. Problem with the heater box? Ideas? (by the way, the flap inside the engine compartment that controls fresh air intake versus recirculation doesn't work, and is stuck on fresh air in - not sure this matters). Thanks! (airflap.jpg) Attachments ----------------  airflap.jpg (168KB - 1 downloads) | ||
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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156  | RE: 460 - No hot or cold air - what's wrong? Also check your heater valve. There should be a push/pull cable attached that opens and closes to allow hot air to circulate and heat or prevent to allow cool air (no heat). This cable is actuated by the middle lever in the console that goes right to 'red" and left to "blue". I assume you have the factory A/C...if so the round knob nest to the recir switch on dash must be turned to the right with the blower motor on. Also note on diesels it may take a little drive or run the motor 5 minutes before hot air develops. I reposted photo showing hot air valve and where to look to see if cable connected. Good Luck, Mike (airflap.jpg) Attachments ---------------- airflap.jpg (42KB - 0 downloads) | |
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| DUTCH Administrator Doppelgänger Date registered: Apr 2006 Location: US, GA, Atlanta Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter Posts: 9963  | RE: 460 - No hot or cold air - what's wrong? DesertStar - 5/6/2007 3:27 PM Also check your heater valve. There should be a push/pull cable attached that opens and closes to allow hot air to circulate and heat or prevent to allow cool air (no heat). Hot water to circulate to heat the incoming air.  | |
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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | ||
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| sjtymko G-Class Photo Host Date registered: Apr 2006 Location: Canada, AB, Sherwood Park (Edmonton) Vehicle(s): 2002 G500, 2009 B200 Posts: 511  | ||
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| Boy G Expert Date registered: Feb 2007 Location: Bushveld, South Africa Vehicle(s): Diesel G's: 617A and 602 Posts: 1683  | ||
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| Re: 460 - No hot or cold air - what's wrong? HI and thanks for your help, folks. I've put an offer on the truck, and if I end up buying it, I'll be back to inquire about other things to check to find the source of the problem, and will appreciate your input at that time. Hopefully, it's not something that will require dismantling the dash, and hopefully the AC can be fixed up (the truck is painted black, so AC will be welcome in the Summer!).  Cheers. | ||
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| Boy G Expert Date registered: Feb 2007 Location: Bushveld, South Africa Vehicle(s): Diesel G's: 617A and 602 Posts: 1683 | RE: 460 - No hot or cold air - what's wrong? Thanks for your PM, Here some pics. The non a/c unit has a different fan. The front view of this box (a/c unit) shows the fan housing lowermost. Those four outlets at the bottom are a/c condensate water drains and a very common reason for all the posts on this and other forums about moisture under the front mats. The rear view shows the A/c evaporator radiator. It is a bit ineffective in really hot (40Deg C +) weather as the fan sucks through it rather than blows and at high fan speeds makes the cab noisier not colder! The two black hoses going left are the a/c gas pipes. If you split this unit the heater radiator is found in the middle - the pipes are the two center left in the rear view. Some opinions: This box rarely gives trouble but if it does you know it is a fiddley job to strip and repair. Ask me! If your a/c doesn't work check gas first as no other part of the system functions without it - ask for dye to be added so as to track leaks in future. The a/c compressor should then audibly engage (slightly lower engine rpm and after a few minutes the electric fans up front should also start if its the same as mine.) You should now get light frost on your eyebrows If your heater doesn't work when the vehicle is warm - disconnect the hoses that go through the firewall into the cab and flush through with a hosepipe and my guess is some foul reddish sediment will come out. Also the valve in your photo can be flushed. These are often suspect on the older G's (don't switch off and send hot air through the side vents. They are cheap here - about $ 15.) Good luck! I hope your offer is accepted (Rear.JPG) (Front.JPG) Attachments ---------------- Rear.JPG (223KB - 0 downloads) Front.JPG (166KB - 0 downloads) | |
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