Question about 2001 Chevrolet Tahoe

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2001 Tahoe LT 5.3. Air conditioning compressor cut out when outside ambient air is 60F or above and engine reaches OP temp. Hi and low pressure perfect. Replace Hi & Low cutout switches. Drew down system and recharged. Reset climate control unit. Polar cold until OP temp reached. Suspect ambient air temp sensor or sunload temp sensor. Where are they located. Any solutions to or thoughts about this problem

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  • pcmurphy Jun 02, 2011

    Helpmech,



    I do not see a sensor near the top radiator hose connection to the engine. I replaced the temp sensor that is just below the right side running light, and the A/C ran like a champ. However, the ambient temp today was arounfd65F. There is another, what I assume to be a temp sensor, midway between the headlights and in front and at the lower edge of the condensor. I may have to replace it as well.



    Phil

  • pcmurphy Jun 02, 2011

    Help,

    I've replaced the high and low sensors.

    Phil

  • pcmurphy Jun 02, 2011

    Help,

    I've replace the temp sensor that is just below the right side running light. A/C good. However ambient temp was 65F. There is another temp sensor between the headlights and at the lower edge of the condensor. I may need to replace it.

    Phil

  • pcmurphy Jun 13, 2011

    Help, I replaced the ECT sensor and reset the PCM. A/C seems to be working now.

    Phil

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  • Chevrolet Master
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There's a feed from the engine coolant temperature sensor into the AC controller as if the controller thinks the engine is overheating it'll shut down the AC to reduce the load on the cooling system

Try unplugging the cooling sensor on the engine ( follow the radiator top hose back to the engine as the sensor is close to this) and see if this replicates the problem, if it does then you know thats the issue.so the coolant temperature sensor needs to be replaced.

--------------
Also the possibility is faulty evaporator temp sensor.It may be sending a false signal to the climate control module that the evap is around freezing temperature thus shutting down the compressor. The evaporator temp sensor is located on the evaporator housing, in the a/c system, and monitors the temp to prevent the evaporator from freezing up. If the AC control module sees the temp going too low, it will send a communication message to the pcm to turn off the a/c compressor until the evap temp returns to an acceptable range. The other possibility is the high pressure switch located on the line in the right hand side whell arch. Why I mentioned the high pressure switch because as the temp increases the pressure in the system increases and if the ECU sees this signal from that pressure switch in the wheel well on the a/c line it will shut down the compressor. You can test this with a digital voltmeter or install a set of gauges to the high and low side service ports and see where the pressure go. It also may be the temp sensor element on the compressor itself. ----------- This should help.Thanks.Helpmech.

Posted on May 29, 2011

  • raj somaiya Jun 03, 2011

    Yes replace that sensor too.And check, if that makes any difference.Keep updated, with results.After replacing the sensor.Disconnect negative terminal of battery for 10 minutes, then reconnect and check.this resets the computer system and new replaced sensor gets detected.-------Thanks.Helpmech.

  • raj somaiya Jun 13, 2011

    Thanks, for the update.Helpmech.


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