Freightliner Cascadia '20 bunk heater not heating

Discussion in 'Freightliner Forum' started by Dennis143, Apr 30, 2021.

  1. Dennis143

    Dennis143 Bobtail Member

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    Apr 30, 2021
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    Hello, got a problem with my bunk heater can't seem to figure out what's wrong need help.

    When I turn the bunk heater on it blows cold air, no smoke seems to be coming out of the exhaust for the bunk heater. I tried turning it off, and back on a couple of times didn't work. I think the problem might be the fuse or just resetting the bunk heater, although can't find the switch (got older version).

    If someone had a similar problem or may know what can be the problem please share, thank you!
     

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    Last edited: Apr 30, 2021
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  3. Brandt

    Brandt Road Train Member

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    You truck must have the park smart system. I can see the button on temp setting. You have to push button on temp setting it should turn orange. Your truck probably has Optimized Idle or EAPU. You turn on Optimized Idle and the computer will turn on the Orange light on the temperature setting in the sleeper and you turn on the fan speed in the sleeper and it should turn the heat or a/c on depending on the temperature you set it for.

    IMG_20210501_073156383.jpg
    IMG_20210501_073156383.jpg IMG_20210501_073205840.jpg
    IMG_20210501_073235883.jpg
    IMG_20210501_073256010.jpg
     
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  4. Dennis143

    Dennis143 Bobtail Member

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    Thank you for replying, really appreciate it!

    When following your instructions I could only push the temp button with engine off, does it mean I can only use a/c with turned on engine?

    On my truck there is an exhaust system so I thought I have something like a webasto heater feeding fuel not the truck itself. Would you think that I need to have my truck engine turned on in order to power up my heater?

    Thanks again, have a good day!
     

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  5. Brandt

    Brandt Road Train Member

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    The button is like on/off switch for the Electric a/c and diesel burning heater. When Optimized Idle is turned on at the front dash. The light in sleeper should come on automatic. That's how it work in my 2020 freightliner. My truck has the electric APU. It's 8 batteries in total. The sleeper has a separate diesel burning coolant heater. It heats the coolant and keep the engine at 150f. That how is heats the sleeper also.

    Then is has electric a/c for sleeper both system will run about 6-8 hours on the batteries. Then engine will start automatically to recharge the batteries. If you turn on Interior Comfort Mode. It will Start the engine to heat or cool the sleeper faster. Then shut off and run on batteries.

    Truck has 4 batteries under driver side seat like normal. Then you can see box behind sleeper that holds 4 more batteries

    IMG_20210501_174130139_HDR.jpg
     
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  6. Brandt

    Brandt Road Train Member

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    This is the electric a/c part on back of sleeper IMG_20210501_175710506.jpg
     
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  7. Brandt

    Brandt Road Train Member

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    Have changed my info a little. When you turn on Optimized Idle with or without Interior Comfort Mode. You should see this with the sleeper fan off IMG_20210501_181149296.jpg

    When you turn on sleeper fan the Park system will light up and you should hear the electric a/c or the heater should fire up and blow some heat. If the engine is cold the heater has to heat the coolant first to get some heat going.
    IMG_20210501_181219951.jpg

    The only downside to the system is it only blows heat or a/c in the sleeper. If you turn on Interior Comfort Mode. When the computer starts the engine it will blow heat and a/c out the front dash vents at the same time.
     
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  8. Dennis143

    Dennis143 Bobtail Member

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    Hello thanks again for replying, followed through but still have issues.

    When engine is off my Optimized idle is off, I put park button on and turn temperature control to heat position "not to the coolant". Fan is working but heat is not coming out. What did I miss? Heat comes out for 10 min after engine off but it is cold later.

    Thanks again for your help, peace!
     
  9. Brandt

    Brandt Road Train Member

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    Not sure what you mean when saying Optimized Idle is off when is engine is off. You have to turn the ignition key on and leave the key on all the time. The dash lights and stuff will be on all the time. Optimized Idle let's the computer start at stop the engine automatically. Optimized Idle will start the engine if the batteries get down to 12.1 volts. It will also start engine to keep engine oil warm. You turn ignition key on and leave it on. You don't have start the engine. You turn on Optimized Idle, now the computer has control of the engine.

    Then you go in sleeper and turn the temperature all the way to hot and turn the sleeper fan on high and see if blow hot air out. Look at the engine temperature on the dash. If it stays at 160F you should have heat in sleeper. If it won't hold at 160F the heater probably is not firing up. You should be able to feel hot air coming from vent/exhaust pipe on back of sleeper on the out side. You can also hear the little fuel pump click click clicking as it's pumping fuel from tanks into heater from outside.

    Maybe the heater is not firing up. It burns Diesel soot builds up inside them and the won't fire up. If you turn on Interior Comfort Mode on the front dash screen for Optimized Idle. That should start the engine when you turn sleeper heat and sleeper fan all the way up.
     
    Last edited: May 2, 2021
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  10. Dennis143

    Dennis143 Bobtail Member

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    Thank for replying, and bearing with me!

    Today I have made sure that ignition was on, batteries charged, engine warm, optimized idle on. The air was warm for about 18 min later it started to get cool, the temperature dropped to 100F didn't keep at 160F. Then I tried turning on interior comfort with engine on, with heat and sleeper fan all the way up. The engine kept running and didn't turn off even though the batteries were charged. Any thoughts? appreciate it, peace!
     
  11. Brandt

    Brandt Road Train Member

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    Sound like the heater is not firing up because it also won't keep the engine warm. I would just turn on Interior Comfort Mode, like you did. Then let the engine keep you warm. Your truck if the same as mine. Now has 2 a/c unit and 2 heaters. You have the regular a/c on the engine and the regular heat from engine. Then you have the electric a/c unit in the sleep and the diesel burning heater under the sleeper.

    This might help you understand the system better. Detroit Diesel had Optimized Idle back in the 90s. That setup just used the regular engine for heat and a/c. So when sleeping at night the computers would start and stop the engine all night. Many drivers did not like that. So they did would just Idle the engine all night. That was normal back then.

    Then they started to put diesel burning heaters in the sleepers. They could run all night but that did no solve the sleep a/c probably in the summer. So driver still would idle trucks all night. Today they have Electric a/c in sleeper when parked and the diesel burning heaters and extra batteries to runn all the for 8 hours when parked.

    When you had/have Interior Comfort Mode on it will run the engine more if the bunk diesel fired heater or the electric a/c is not working. You won't have the benefit on the newer electric a/c or sleeper diesel burning heater. You just have the basic system like in the 90s. The engine will idle more depending on how much heat or a/c you need. Your electric a/c might work fine and just diesel burning heater won't fire up.

    That's why the engine keeps running even if that batteries are fully charged. It's trying to keep the sleeper warm or cool depending on the temperature you set in the sleeper.
     
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