AC Trouble....

Discussion in 'Gen 2 Prius Technical Discussion' started by dirt657, Mar 7, 2019.

  1. dirt657

    dirt657 Member

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    Hey guys, made a thread a couple days ago about this prius. It has been nothing but problems. Needed a new dash piece, had leaking electrolyte in the hybrid battery, had a bad Multi function display, and of course the AC was also bad. I have either fixed or ordered the parts to fix almost everything and thankfully now the car is actually running.

    Now, for the AC issue at hand. When I first ran techstream, I got the B1423 code. Next time I checked techstream (after replacing the Hybrid battery), I noticed that another code, B1421 came up. I went to O'Reilly's and picked up some refrigerant (being sure to get a 134a without oil) and a gauge. I checked the gauge and realized that there was no pressure. Then, I added refrigerant for maybe 1-2 seconds tops and the gauge shot up to nearly the red, so I stopped. I went back inside the car and checked to see a difference in AC temp and there was none. So then, I pulled up techstream again and checked the codes, which then brought up a B1476 code. I haven't done much with AC in the past and as many of you have probably released by now, I buy and resell these cars and I also have one for myself. If anyone can shed some light on this situation, that would be great.

    Summary: Car had a B1423 and a B1421 code, refrigerant was added and then those codes went away and out came a B1476. I don't want to sell this car until I get the AC working and I am trying to fix this myself instead of taking it to an AC repair guy.

    Thanks, Cole
     
  2. Skibob

    Skibob Senior Member

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    Sounds like you are gonna loose money on this one.

    What kind of Gauge did you buy? Sounds like the refrigerant didn’t make it into the system to me.
     
    #2 Skibob, Mar 7, 2019
    Last edited: Mar 7, 2019
  3. ChapmanF

    ChapmanF Senior Member

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    A lot of us on PriusChat are happy to help, but we don't always have all of the trouble codes memorized.

    For example, I do have the B1421 code memorized; that one's the solar sensor code. Pull codes at night or in the shade, you always have a B1421. Pull codes when the sun's out, it's "cured"! Just serves to confirm your solar sensor's working.

    The other two I don't have memorized, though somebody else might turn out to. Otherwise, somebody has to look them up in the repair manual first and then help you.

    That leads to one suggestion that can always help you get more useful responses faster when you start a thread here: if you start by looking up your own codes, and include a little summary of the detection conditions for them in your post, that jogs the memories for all the rest of us, so we can immediately participate in solving your issue, without all of us having to duplicate the lookup effort that only has to happen once if you do it. :)

    The "detection conditions", by the way, are not the same as the little one-liner "fortune cookie" that you'll often find on the summary screen of a scan tool, or on the internet by googling the code. The detection conditions are a little boxed-in paragraph or so that you find on the first page of the repair manual section for that code. What they tell you (as the name suggests) is exactly what needs to happen in the car to make the ECU set that code. Usually, as soon as you've looked up the detection conditions, you're already halfway (or more) to working out what the problem is.
     
  4. dirt657

    dirt657 Member

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    Just a standard gauge off O'Reilly's shelf attached to some R134a.
     
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  5. dirt657

    dirt657 Member

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    Seems easy enough. I'm gonna go rent the manifold gauge from O'Reilly's tomorrow and have a go at it. I have a spare parts prius that I know for a fact has working AC. I'll get it going. Finally going to get some sun tomorrow here in "not-so-sunny" california.
     
  6. jerrymildred

    jerrymildred Senior Member

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    Don't use a rental gauge to add coolant. It will probably have residue from non-hybrid air conditioners and contaminate your system with the wrong oil.
     
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  7. Skibob

    Skibob Senior Member

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    Thank god someone said it before he did it. You have to buy a dedicated set of gauges for the Toyota hybrids.
    Try squeezeing the connector down, sometimes the cheap connectors don’t open the schrader valve.
     
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  8. dirt657

    dirt657 Member

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    I’ll buy one from harbor freight then.
     
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  9. dirt657

    dirt657 Member

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    Is there a specific hybrid ac oil or is it no oil at all? I read not to use any refrigerant with added oil but that’s it lol
     
  10. dirt657

    dirt657 Member

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    Ok now that I’ve messed with it, I’m a little confused with the guide provided. I turn the ac on and the fan doesn’t come on. So then it says to inspect the fan. What does that entail?
     
  11. dirt657

    dirt657 Member

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    Update. Plugged the manifold gauge in to diagnose the B1423 code that disappeared. Everything drained out as soon as I plugged it in so I’m assuming something was stopping it from taking the charge and the compressor still isn’t on. So I’m gonna diagnose the 1423 code as I think maybe the pressure switch is keeping the compressor from turning on
     
  12. Skibob

    Skibob Senior Member

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    As I said before. The cheap hose you were using probably didn’t open the schrader valve. I have had it happen with those cheap hoses myself.
    Sounds like the AC has not worked in quite some time. Probably has at least a leak, possibly contaminated. Will most likely need more than just a recharge.
     
    #13 Skibob, Mar 8, 2019
    Last edited: Mar 8, 2019
  13. dirt657

    dirt657 Member

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    I have come to the conclusion that:
    A. There is a leak in the system as verified by the manifold gauge.
    B. The AC compressor is not turning on and is most likely bad, after using a jumper wire to test the switch, it still doesn’t turn on. This means it could also have a bad switch.
     
  14. Skibob

    Skibob Senior Member

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    Have you checked the ac part of tech stream yet? It tells a lot about the system if I remember
     
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  15. dirt657

    dirt657 Member

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    I have not. It seems pretty black and white to me now but if I know what I’m looking at I can certainly look into it.
     
  16. dirt657

    dirt657 Member

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    Ok so I’m doing the AC job this upcoming week. The AC compressor with new wiring harness is here and I got a new switch as well. Just to be safe does anyone recommend a specific refrigerant and oil that they can link me to off amazon or something? I just want to do this right the first time only and I’m seeing a few different opinions. If anyone could list the refrigerant refill and oil specs that would be great.
     
  17. Roccobro

    Roccobro Junior Member

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    What was the conclusion on your AC? Summer might show up someday here in SoCal and my 2005 needs AC attention.

    Thanks,
    Justin
     
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