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Toyota Repair/A/C pressure readings


Hello, I own a 2008 Highlander Sport with the 3.5L engine and 66,500 miles. I purchased the vehicle used with about 58,000 miles on it. The vehicle has the driver and passenger auto a/c system. It does not have the rear auto a/c control. What should the correct high and low side pressure readings be on a fully charged system at a 90-93 degree ambient temperature? I just started having a problem with the drivers side blowing warm air but the passenger side still blows cold air. I would like to check the pressure readings first off. What else could be the problem if the pressure readings are good on the gauges? Thank you for your time.

Hello, with the engine running and the a/c compressor running the low side pressure should be 35-38 PSI, the high side should be about 125-150. The vent problem may be due to a malfunction air door actuator or the control system, if it has the auto control the system has to be diagnosed using a diagnostic tool that can access the auto air control system.

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Ted Ritter


I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.


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