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Multi-Diag Access J2534 has the function for air condition, such as Diagnosis of cooling electronic, Reading settings cooling circuit,Test servo actuators http://www.careucar.com/wholesale/[email protected]
The first thing that you would want to check is that the a/c compressor is coming on when the a/c inside is turned on. If the compressor is turning on and off really quickly then you are probably low on R-134A refrigerant for the a/c system and you will need to check for leaks.
3500 is about normal for an xb at 65 mph. My previous ride was a pickup and rolled at about 2000-2500 on the highway. But the XB's engine is way more "tightly wound". Your rpm gage should run at about half of of your speed...ie: 70 mph will be about 35 (3500) rpm, 80 mph will be about 40 (4000) rpm. Freaked me out when I first got the thing, but after researching it Ive found out that with a stock engine it actually runs more efficient at the higher RPM's. The 06 boxes won't redline until 6000 rpm, so unless you are driving 120 on a frequent basis you're good. You can probably have it modified to run lower, but you will lose the awesome gas mileage and overall it is not going to improve the way it runs, and would have no benefit............
You can buy a neat little tool called a settingsaver (pretty much a 9v battery that plugs into the lighter. It permits you to disconnect battery without having problems with radio, security system etc.
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