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Old 10-09-2013, 06:09 PM   #1
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Dash air and heat stopped working

My dash air conditioning and heat has stopped working. This is a 2003 Allegro Bus with a Freightliner chassis. The fan blows air from all the different speeds and the mode selector seems to be working properly, it changes the air distribution outputs from off, vent, floor, etc. However the temperature control has no effect on the output temperature, it blows ambient air all the time, it wont even put out hot air. Any help or suggestions appreciated. Is there a fuse for the temp controller? Thanks
Don
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Old 10-09-2013, 06:11 PM   #2
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Sounds like the expansion valve is stuck.
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Old 10-09-2013, 06:22 PM   #3
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It. Is not uncommon for the expansion valve to be stuck due to shavings from the compressor. Therefore, you may think about replacing the compressor as well if that is it.
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Old 10-09-2013, 06:22 PM   #4
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It may be mounted on the right side, behind the blower motor but could be a major PIA to get to. They are simple to replace once you get to them. There should be a door on the R side, in front of the codrivers seat you can remove and push the door fwd or back. Really funny thing is they are automotive quality usually.
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Old 10-09-2013, 06:47 PM   #5
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Try sliding temperature control and make sure the cable is moving and still connected at the heater valve. Sounds like the cable is disconnected from slider, thus no control of heat or A/C. To test A/C, a jumper wire from a known 12 v (+) source can be touched to wire going to compressor clutch and A/C should operate. Don't do it too long, if pressure is low (or high) the jumper is bypassing low pressure cut out.
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Old 10-09-2013, 09:31 PM   #6
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Thanks for suggestions. The temp controller is electrical, there is no control cable that I can find. If it was the expansion valve stuck, I still should be able to get heat, right?
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Old 10-09-2013, 10:07 PM   #7
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Sounds like the same problem we're having fixed right now. Heater and AC both work but no control over the temp. Just warm on heat and cool on AC. The rheostat on the dash talks to a small valve in the heater line. Both parts are due in tomorrow and then we'll know for sure that the problem has been fixed.
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Old 10-09-2013, 10:36 PM   #8
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Yes, heat should work if the expansion valve is blocked, but I'd consider that a rare occurrence. Since you have neither heat or A/C I'd think it's more likely the temp. control. How does your dash control work? If it is a slide from cold to hot, I bet there is a cable in a sheath. Under the hood you should see the heater hoses going into the heater box. On one of those hoses should be a control valve. It will have an arm that is either pulled or pushed by a cable, vacuum valve or an electric control valve. Evans Tempcon is the manufacturer of most Freighliner RV dash systems. Evans Tempcon, Inc
You can contact them or search their website for information.
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Old 10-10-2013, 03:28 PM   #9
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I just had a dash air repair that turned into a real interesting project for my 99 Holiday Rambler Endeavor I just bought. The previous owner did disclose that the air was non-functional.

Well, noticed that the compressor drive belt was MIA. Ok, also noticed the Cummins 5.9 cooling fan blades were all missing about 20% of their surface are. Ok, put two and two together and figured the AC compressor froze and the belt burned up and got tangled up in the fan.

Had the compressor, dryer, belt, belt tensioner and engine fan installed. My tech noticed the system temps were ramping up past normal during testing and discovered the condensor fan was also non-functional. Replaced that unit.

This may have been the genesis of the entire failure. He replaced it and all was good.....so we thought.

A small leak revealed itself on the high pressure side avaporator fitting on the front of the coach. Took the fitting apart to inspect the o-ring...mangled from a previous service. Worse, the three little copper tubes that joined into a one-tube fitting was mangled at the single tube end as the previous tech must have forced the fitting together, thus the o-ring damage. My guy worked for two hours to try to save the evaporator by filing the single tube to where the fitting could come together and seat properly on the o-ring....it worked! What a money hole these coaches are...lol

Total: $1800

If your compressor turns out to be defective, check EVERY other component of the system. Also replace the dryer, as that seems to catch any compressor debris.

Hope your situation is a simple one.
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