Is this normal? - Page 3

Is this normal?

This is a discussion on Is this normal? within the RAM 1500 Diesel General Discussion forums, part of the RAM 1500 EcoDiesel Forum category; Take some temperature readings before making a refrigeration charge status determination. Keep in mind the system uses a refrigerant subcooler, what where you take your ...

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  1. #21
    Super Moderator Crash68's Avatar
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    Take some temperature readings before making a refrigeration charge status determination. Keep in mind the system uses a refrigerant subcooler, what where you take your temperature readings.

  2. #22
    RAM Rookie Herculezjt's Avatar
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    Quote Originally Posted by Crash68 View Post
    Take some temperature readings before making a refrigeration charge status determination. Keep in mind the system uses a refrigerant subcooler, what where you take your temperature readings.
    Will do, couldn't find my thermostat yesturday. So your saying take the reading at the heat exchanger/subcooler?

  3. #23
    RAM Rookie Herculezjt's Avatar
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    Ok, this is where I'm at:
    AC Low and fan full speed at the vent I am reading 32F. Pressure for low is 40psi and high is around 235 psi. This is telling me I'm under charged and I'm possibly freezing over
    Attached Thumbnails Attached Thumbnails Is this normal?-20190605_162145_1559770105691.jpg   Is this normal?-20190605_162054_1559770143340.jpg  

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  5. #24
    Super Moderator Crash68's Avatar
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    what's the ambient temperature? You have a 9°F evaporator and it's blowing 32°F air. Check the suction line temperature, it maybe frosting and your discharge isn't really all that low. When your low on refrigerant, the supply temp is usually warmer than expected not colder.
    I would start to suspect a plugged filter, plugged evap or airflow restriction.
    Use a temperature probe, those IR sensors are garbage for diagnosis work.

  6. #25
    RAM Rookie Herculezjt's Avatar
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    Quote Originally Posted by Crash68 View Post
    what's the ambient temperature? You have a 9°F evaporator and it's blowing 32°F air. Check the suction line temperature, it maybe frosting and your discharge isn't really all that low. When your low on refrigerant, the supply temp is usually warmer than expected not colder.
    I would start to suspect a plugged filter, plugged evap or airflow restriction.
    Use a temperature probe, those IR sensors are garbage for diagnosis work.
    Ambient was 93F, I'll pick up another probe, cant find it my old one. Been looking at PT Charts, but keep seeing different PTs

  7. #26
    RAM Wizard Brokedownbutgood's Avatar
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    Need a physical style temp sensor like a meat probe infrared style does not work well for that test it with max ac on and at a high idle.

  8. #27
    Super Moderator Crash68's Avatar
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    Quote Originally Posted by Herculezjt View Post
    Ambient was 93F, I'll pick up another probe, cant find it my old one. Been looking at PT Charts, but keep seeing different PTs
    Didn't notice the typo above, I was attempting to type 39°F..
    how is the air colder than the evap?

  9. #28
    RAM Rookie Herculezjt's Avatar
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    Quote Originally Posted by Crash68 View Post
    Quote Originally Posted by Herculezjt View Post
    Ambient was 93F, I'll pick up another probe, cant find it my old one. Been looking at PT Charts, but keep seeing different PTs
    Didn't notice the typo above, I was attempting to type 39°F..
    how is the air colder than the evap?
    If my understanding is correct, the evap freezing over? We typically have 80% or more humidity. If I turn the ac off but run the fan high, the sound goes away after about 20 minutes, will also get spurts of cold air. Will also go away just running on max ac as well

  10. #29
    RAM Rookie Herculezjt's Avatar
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    So picked up a probe, while driving home, about 5 miles, was reading 43F, full ac. Had no noise either, put it to auto at 73F and at idle the noise came back around 10 minutes

  11. #30
    Super Moderator Crash68's Avatar
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    Have you checked if the previous owner added an air filter? You have to drop the lower glovebox to get at it. There is a removable door right above the blower.

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