I've noticed my '99 suburban's front AC is notable warmer than the rear. I can tell quite a difference simply holding my hand in front of the two units. Front use to be colder than the rear. Front is an orifice tube. Rear is an expansion valve. I did the last charge and it was done by weight. I can check the pressures and blown air temperatures easy enough but I'm not sure what that info tells me.
Questions:
1) If the charge is low, is it common for the two systems to blow significantly different temps? Meaning, is this ever indicative of a charge problem?
2) I'm suspecting a partial clog somewhere. The evaporator and orifice tube being the likely place to look since the rear system seems unaffected. Orifice tube would be the easiest to replace. What are the symptoms of a bad orifice tube? I'm assuming they can go bad.
Thanks for any suggestions on where to begin.
Questions:
1) If the charge is low, is it common for the two systems to blow significantly different temps? Meaning, is this ever indicative of a charge problem?
2) I'm suspecting a partial clog somewhere. The evaporator and orifice tube being the likely place to look since the rear system seems unaffected. Orifice tube would be the easiest to replace. What are the symptoms of a bad orifice tube? I'm assuming they can go bad.
Thanks for any suggestions on where to begin.
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