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Thread: Freightliner m2 A/C problem. Heater core all frozen/ icy

  1. #1
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    Freightliner m2 A/C problem. Heater core all frozen/ icy

    Every now and then my ac stops blowing the right way and it happens because the heater core gets all iced up and frozen and doesn't let the air to flow thru. I was wondering if anyone has experienced this and if there's any way to stop this from happening. Thanks

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  4. #2
    Senior Moderator davekc's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    That is usually from low freon. Second cause would be a bad expansion valve.
    scottm4211 likes this.
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  6. #3
    Senior Member BobWolf's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    You might be low on refridgerant or have a blockage. First thing you need to find out is what the specs for your truck and the ammount of refridgerant, line preasuers. After that you need a guage set to check how much freon is actualy in the system, and preasures on the high and low side both with the compressor idling and engaged. I dont recomend just adding refridgerant too litte as well as too much can destroy your systeme.

    Any aditional reading and or doing is at your own risk
    If your truck has alot of mileson it, and you have owned it for at least a few months, and you know the pressure specs, and you have the guage set, and the tools, and the knowhow you can try adding one can of refridgerant to the low presure side
    and see if this inproves things if you dont get good results take it to an AC shop.
    spongebox1 likes this.
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  8. #4
    Senior Member hossman2011's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    I just replaced the compressor, dryer, expansion valve in my M2.. compressor was bad and leaking. Be sure to have them look at your hoses while it is apart..... Great people in the Houston area... Jordy's truck and trailer parts.. fair and fast...know what they are doing
    spongebox1 likes this.

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  10. #5
    Senior Member spongebox1's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    My m2 does the same thing, I just replaced the evaporator coil, condensor and it would freeze up from time to time, I took the cab filter door off and found debris blocking the drain hole, cleaned out the drain tube and seems to be working better now

    Sent from my VS910 4G using EO Forums mobile app

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  12. #6
    Moderator Dynamite 1's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    There is also a resistor that can be bought that plugs inline in the temp probe that is in the front of the cabin filter housing that also helps with the problem. Was common when the M2's first came out. Any dealer that does expedite units should know about and have or be able to get the resistor. You can google the problem and find info on it but by all means check out everything else also.
    kamilski likes this.
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  14. #7
    Senior Member Monty's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    Consider what is freezing ..... (that will be the humidity in the air). An occasional "thaw out" of the system by turning the a/c off for a bit can be helpful.
    kamilski likes this.
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    Senior Member BobWolf's Avatar
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    Re: Freightliner m2 A/C problem. Heater core all frozen/ icy

    Have you checked BOTH A/C coils Condenser behind the grille and Evap in the heat/airbox and any cabin filters. If theyre crudded up you wont have airflow and you will turn your A/C into an icemaker. Most hardware stores sell a condenser brush th clean the coils use the brush and a shop vac. You will have to disassemble the dash to get to the evap coil.

    Bob Wolf
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