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  • Rav 4

    2010 rav 4 manual ac. Compressor is good. No signal coming out of the amplifier. I’ve got signal going in. Are there problems with these things that anybody knows of? Pulling what little bit of hair l have left out. Thanks in advanced.

  • #2
    Welcome. Lost my hair long ago over certain things. Need YOUR help with what you have here, my fault I don't just know. Just what do you mean by "Amplifier" and the term "Signal" from it?

    At a loss where you are testing for what or observing something.

    More questions:
    1. What makes you think a compressor is good?
    2. Is this by any chance a constant running compressor with no clutch I thought only one Euro vehicle was doing that so far?
    ** That and please always post your "static" pressure at what ambient temperature your are in.

    We'll get there A/C is slow for what is off season for many just in from putting a snow plow on my truck for an expected blizzard before daylight have to switch gears to think A/C anything - bear with me/us,
    Tom
    MetroWest, Boston

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    • #3
      OK, you said via Private Message you found the problem is the Amplifier. This item acts as a thermistor does allow ECM to enable or disable power sent on to engage the clutch of the compressor. There's no power coming out no doubt goes thru a relay under hood then on to the clutch's coil. Instead of looking for pressures it's converting temps to a signal to do this. Knowing that's good is the first test I would do then on to a high end scan tool for codes and if found post the number you get or results.

      You sure could lose hair getting convincing information on where the problem is I'd begin with testing the relay and keep it simple. If you have zero or very low static pressure the system should default to not engaging the clutch at all if no power found there it isn't going to engage. Pressure too low or temps too low if both in a reasonable range them time to really pin it down to a fault with the amplifier or just that it's getting signals out of range.

      Manual A/C or not it's really computer controlled but suggest at possibly 8 years old ordinary connections, wiring or relays are the primary fault first if just to rule them out. Here's a video on where to look for the relay at least and hope that helps > https://www.youtube.com/watch?v=NBtua13dTdE <

      So let's rule that out before this gets more involved and costly for no good reason,
      Tom
      MetroWest, Boston

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      • #4
        The compressor is a constant. Has no clutch nor a clutch relay. I can command it on through my scanner and it gets cold. I can also apply voltage and it’s cold as well

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        • #5
          OK - It's one of those. I have no precise published info on further testing of the amplifier itself except for ruling everything else out as known good. It's probably going to take the specific software and or device/scanner sometimes only a dealer would pay for to either reset it or some items like this their equipment must acquaint the replacements to your specific vehicle.

          Site is expectedly slow to a stop for activity for Winter and new from the original site once very active was closed for archives I don't recall seeing this issue and read about everything ever posted there for ages. Nacho is a member here is you best chance for some testing procedures I believe still actively in biz working in Hermosillo, Senora, MX.

          I'd send him a PM to please stop in for his input refer to this link in that message will bring it right here > https://forum.aircondition.com/forum...orum/639-rav-4 < will be your best bet for diagrams to follow and procedures to help rule everything else out that would cause lack of power to make this type compressor work not just be a pulley in the belt system. For now that's the best I can do without buying software myself which isn't already in my possession and isn't,

          Tom
          MetroWest, Boston

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