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Message: <blockquote data-quote="ORVietVet" data-source="post: 24807" data-attributes="member: 9438">Widow of an A/L friend of mine with a 2005 Tahoe LS with the manual HVAC controls. Problem: Intermittently the a/c will be on and then blow warm. Intermittently the a/c will not even turn on and then will kick on while driving.Attached gauges at shop for intermittent a/c problem. This is the same 2005 Tahoe I did the exhaust manifold clamps on recently. Drove to pick her up and was ice cold and 1/2 way there, started blowing warm till got to her house. Shut off. She got in. Drove back to my house and a/c worked the whole way.At shop today.....Ambient temp at 84 degrees.....29 degrees out the vent..... low pressure at 25 psi and high pressure at 200 psi.....system working normal..Found 2 history codes: B0408-Temperature Control 1 Circuit Malfunction & B0418-Temperature Control 2 Circuit.</blockquote>