No, not what my wife would wish from me, and forgive me if this is in FAQs, but I'm about to run out the door and wanted to plant this. The first time I used the heater this year, I got off and on again warm air, only consistent if I cranked the output temp up to "full". It got worse, until this past week I get nothing but cold air, no matter if the temp control is set to "auto", somewhere in the middle of full on peanut roasting mode. I'm ruling out a heater core blockage as the coolant has been systematically changed at recommended intervals, the overflow tank level is always correct for operating and ambient temps, and the engine temp gauge never budges off the middle, so I'm also ruling out air pockets in the cooling system.
My first question: does the Volvo "Auto climate control" unit have a self diagnosing feature? Most of the Japanese cars I worked on as a tech over a 30 year span did, and while it was never the end-all way to the fix, it was at least a good indicator of where I needed to look.
Second question: anyone ever run into something similar? It's not particularly cold here (Central Texas) but it would be nice to use the defog without my nose getting frostbitten.
I've seen similar issues with my Dodge trucks and if I recall, Lexus had an issue back in the late '90s, but it was two separate issues: broken mode doors for Dodge, and wonky control units in the Lexus, both very expensive. I'm not yet to the point where I don't fill the gas tank (it's got 266k miles) but I'm not anxious to drop a large chunk of change on this thing either.
And thanks ahead of time.