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Old 10-17-2015, 07:37 PM   #1
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No dash heat just cold air

Just bought a Phaeton on the way home noticed there is no heat and engine temp is very low. Looking for ideas on possible cause.

Thanks

John and Maureen
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Old 10-18-2015, 07:49 AM   #2
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If the outside temp is really low, you may not get much heat out of the dash system. One thing to do is turn the fan speed up so that it is blowing a lot more air. Seems to help quite a bit (at least it does in our Phaeton). Also, make sure you haven't pushed the * button as running the A/C will not warm you up either.

The dash temperature gauge is not extremely sensitive or accurate and it may not be a good indicator. It may be possible to look up the actual teperature on your LBCU - grab your Freightliner manual for help. If this is your first diesel, you will quickly learn that they have engine temps quite a bit lower than your car will.

If you need more heat, you can run your coach heating system. You have heat pumps and furnaces or AquaHot that can be run while you are moving.
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Old 10-18-2015, 08:11 AM   #3
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Radiator fans running constantly, engine coolant thermostat stuck open are possibilities, depending on the temperatures you have been driving in, but once you confirm that fans are operating normally you can double check temperatures of coolant components using an infra red gun if you are concerned
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Old 10-18-2015, 08:24 AM   #4
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1 do you have air coming out of all vents?

2 Some engines have a by pass valve to turn off flow of hot air

3 as others have said t stat no working.

4. check radiator hose to see if getting warm,hot.

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Old 10-18-2015, 10:24 AM   #5
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What is engine temp on LBCU?
Heat from vents is not good while driving partly because of the long lines going back to engine and partly because air flow is greater while moving. It might feel cold at highway speed but is hot at low speed or idle.
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Old 10-18-2015, 07:54 PM   #6
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Could also have low level of fluid in radiator, in addition to previous postings.

Guess could also have a problem with the heat exchanger itself in the front dash, control down to valve, internal air mixer plenum (if it's built like a cars). If the hose input temperature at the dash hose connection is hot, then problem internal to the dash. If it's cold, then you're not getting hot water from the engine up to the dash.
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Old 10-19-2015, 12:48 AM   #7
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Suggest you first make sure that the on/off valves (shut off valves) are open on the coolant lines that run from the engine up to the front heater core and back. It's likely that you have 2 valves back there....one out from the engine system and one back in (I guess you could have just one....dunno'). If they are closed....no heat. Should be easy to check and correct. You will probably have to get under the coach with your flashlight to find them....you will likely have one up high and one lower. With luck, yours will have yellow handles like mine. Caution....if the valves are closed and you open them and then get heat, make sure there is no coolant leak at the heater core or at one the several connections up there. Could be that's why the valves are closed. Just a thought based upon my experience....'cause that's exactly what happend with mine.

Please let us know what you find out.....thanks!
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Old 10-19-2015, 07:43 AM   #8
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Quote:
Originally Posted by Butte64 View Post
What is engine temp on LBCU?
Heat from vents is not good while driving partly because of the long lines going back to engine and partly because air flow is greater while moving. It might feel cold at highway speed but is hot at low speed or idle.
The LBCU can be programmed to display all sorts of information if you are interested in it. The instructions are in your Freightliner manual.
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Old 10-20-2015, 05:59 AM   #9
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Wow lots of help and good information, let me start working on these suggestions. Safe travels

John and Maureen
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