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  • High head pressure

    2003 Toyota head pressure runs high when setting still replaced compressor and condenser .System cools when driving highway speedTxV was not replaced can this be the problem?

  • #2
    High head pressure is caused by the condenser not cooling the gas and changing it to liquid. Are electric fans or engine driven fan used? It sounds like not enough air is flowing over the condenser when stopped or the condenser is failing do to poor heat transfer from the tubes to the fins.

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    • #3
      Toyota has a clutch fan and no electric fan .Clutch fan operation is working correctly engine runs normal temperature with AC off

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      • #4
        It works with "natural" air flow but not with this clutch you said was working correctly and about can't be. If viscous oil/thermostatic type they lose a % of pull power year by year usually and a common item to replace some by about 5 years not very strong anymore just enough engine is happy.

        Just feel the air over it with hood open it's not blowing very warm/hot air off of cooling system condenser or radiator if exactly the same one is for both. Prove that misting with water at idle or higher and see pressure come down and cooling restored proves it,
        Tom
        MetroWest, Boston

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        • #5
          Cooling was restored when condenser was misted with water.

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          • #6
            It would be better anyway but from not working this diagnosis both Cornbinder89 and myself is almost sure. Do check for how strong a replacement is said to be and do choose "thermostatic" so it will NOT work hard when not needed, off season they are annoying to me.

            Super HD ones are annoying but if you really want cool A/C that will really help. Good luck, common issue as I said,
            Tom
            MetroWest, Boston

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            • #7
              Originally posted by SKIPPER View Post
              Toyota has a clutch fan and no electric fan .Clutch fan operation is working correctly engine runs normal temperature with AC off
              A bad fan clutch can affect AC cooling and yet not cause the engine/radiator to run hot.


              Originally posted by SKIPPER View Post
              2003 Toyota head pressure runs high when setting still replaced compressor and condenser .System cools when driving highway speedTxV was not replaced can this be the problem?
              I read this as "head pressure runs high when SITTING (idling)". This and system cooling at highway speeds points to a bad fan clutch !!!


              Originally posted by SKIPPER View Post
              Cooling was restored when condenser was misted with water.
              Yet another indication that the fan clutch is bad, not cooling the condenser enough at idle/slow speeds to condense refrigerant from hot gas state to hot liquid state.

              REPLACE THE FAN CLUTCH, AND MAKE SURE FAN BELT TENSION IS OK. Note use of CAPITALS !!! I just replaced the 4-year old fan clutch on my Nissan truck last week, same type of symptoms !!!

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              • #8
                Yes x 3 now for the clutch. Skipper and all, some Toyotas and other hung on to manually adjusted belt(s) even this late so check that as Cusser said. Quality counts and with non self adjusted belts for this do suggest not way too tight but rather check it again in a few days of use it will be different then where you left it.

                Fan noise again: If easy enough and practical for you and it's bearing is good now save it for off season if prolonged known off season for you it's less annoying. Most are OK some obnoxious just me maybe?

                Concur again they don't last for full fan power just work so much but less and less till noticed.

                Side note that I still drive an OE 1997 vehicle and let it be weaker - aware A/C could be stronger but engine temp never falters so leave it for now is only personal not a universal suggestion. Work vehicle - A/C at all of little real importance,
                Tom
                MetroWest, Boston

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                • #9
                  The first thing I'd question is the amount of refrigerant dispensed. Please provide full vehicle data to verify you are correct.

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