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  1. #1
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    Jan 2019
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    Riddle Me This AC Fans

    2007 charger rt
    125k miles
    recently flushed by a shop and recharged
    they and I cannot find out why the low side is still kinda high and are
    blows a consistent 70 deg once car up to running temp.
    air is cooler when driving of course and warm air when at idle

    low speed fans and high speed fans seem to come on at correct times. Low speed come on a minute after ac is turned on and high speeds about when engine is straight up 12 o clock on dash. High speed cycles on for about 4 seconds then off.
    new compressor
    new expansion valve
    new evap core
    new drier
    supposedly has correct amt of refrigerant and oil since shop did it.
    todays numbers are:
    80 degrees outside and cloudy
    static pressure after car sat for 1 hr is 100 low and high
    low side is 51 and high side 265 right before high speed fan kicks on
    compressor clutch is always engaged
    all fuses are good relays look good but didn’t test

    why will this ac not get cool!?
    whomever gets this right gets a gift card of their choice
    (I’m broke so let’s say 25)



  2. #2
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    So those pressures are good. so the system is absorbing and rejecting heat.

    So only thing it can be is the blend door. Door that directs air over evap or heater core. My guess it’s stuck in the middle.


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    Likes Jim McVeigh, reefstar liked this post

  3. #3
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    Quote Originally Posted by Eric40962005 View Post
    So those pressures are good. so the system is absorbing and rejecting heat.

    So only thing it can be is the blend door. Door that directs air over evap or heater core. My guess it’s stuck in the middle.


    Sent from my iPhone using Tapatalk
    Can I get to that without removing dash? I don’t want to do that again .
    putting that evap core in was a b*tch

  4. #4
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    No the blend door and actuator are down by the gas pedal to the right of the gas pedal there are some YouTube videos on how to get to it and change it. Maybe the actuator is bad. Spin the dial from heat to cool and see if you can feel it moving or hear it.


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  5. #5
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    Quote Originally Posted by Eric40962005 View Post
    No the blend door and actuator are down by the gas pedal to the right of the gas pedal there are some YouTube videos on how to get to it and change it. Maybe the actuator is bad. Spin the dial from heat to cool and see if you can feel it moving or hear it.


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    Should I be able to hear or feel it if it is working correctly?

  6. #6
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    Quote Originally Posted by DaBlackBomb View Post
    Should I be able to hear or feel it if it is working correctly?
    I would think so I haven’t actually put my hands on one. If you cant tell remove it


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  7. #7
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    Quote Originally Posted by Eric40962005 View Post
    I would think so I haven’t actually put my hands on one. If you cant tell remove it


    Sent from my iPhone using Tapatalk
    not sure if this would be it as it is dual climate control and air temp is same out of driver and passenger sides .
    that means both blend doors would have to be stuck at same position

  8. #8
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    Can you go to a repair facility and see if you have fault codes in HVAC? Also adjust to max heat and see if vents hot air. Then to max cold - should hear slight difference in blower speed.

  9. #9
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    Quote Originally Posted by Eric40962005 View Post
    I would think so I haven’t actually put my hands on one. If you cant tell remove it


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    Well based on the pressures you provided your evap coil temp is roughly 40 degrees Fahrenheit so idk why your air would be 70 degrees unless you are heating the air at the same time.


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  10. #10
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    Quote Originally Posted by Hemihackman View Post
    Can you go to a repair facility and see if you have fault codes in HVAC? Also adjust to max heat and see if vents hot air. Then to max cold - should hear slight difference in blower speed.
    I tried to get it into cooldown test but it won’t Go in.

    repair facility is in dealer u mean?
    Last edited by DaBlackBomb; 09-13-2020 at 08:03 PM.

  11. #11
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    When is the last time you cycled the temps on both sides to full hot, then full cold? My car needs to have this done occasionally and it is cheap to try. Try doing it a couple times, slowly, and see what you get.
    2006 Charger Brilliant Black R/T w/R&T Package, 6.1 Arrington based 426 Hemi @ 13:1 compression 2016 Hellcat Charger rear cradle and brakes swap, DSS 4" custom driveshaft, 3.09 Scat Pack rear diff.

  12. #12
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    07 have a humidity sensor?
    13 Chrysler 300S, Stock 17 RAM 6.4 BGE with TSP Stage 4 boosted Cam, AIT 18% OD pulley, E-force 2.62 pulley(12.2 lbs boost),, Fastman 84+4 mm throttle body, 1 7/8 kooks long tubes w/hi-flow cats, 3" Magnaflow Cat-back, FTI 2800 stall, Trans by Hellraiser, Dings Racing valve body and tune, Getrag 3.73, Walbro 400LPH, DW 65# inj. aluminum rad. SRT fans. Brembo upgrade. Stage one MOPAR springs, XIX X39 22x9 +15 - 22x10.5 +22 with NITTO NT555 265/35R22 - 295/30R22

  13. #13
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    I actually don’t know lemme check .

  14. #14
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    Quote Originally Posted by Eric40962005 View Post
    Well based on the pressures you provided your evap coil temp is roughly 40 degrees Fahrenheit so idk why your air would be 70 degrees unless you are heating the air at the same time


    Sent from my iPhone using Tapatalk
    yep.
    i just don’t know if that’s possible for both blend doors to be stuck at same position

  15. #15
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    Quote Originally Posted by Hemihackman View Post
    Can you go to a repair facility and see if you have fault codes in HVAC? Also adjust to max heat and see if vents hot air. Then to max cold - should hear slight difference in blower speed.
    I will check for the blower speed first thing in morning

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