Did anybody else get a letter to this effect of the relay for the HVAC module is a possible weak link with connector that will smoke and give off burning smell out of the system flow. High blower motor speeds will show if the system has a bad relay/connector... First I've heard of it with letter today from GM they Extended the coverage for this defect for 10 yrs. or 150k mi. for dealer to fix. Says call dealer if you have problem already or had to fix it on the road for payback from GM. Mine's worked fine so far but now it's time to check the circuits on this HVAC to see if any problems show yet I guess. Just wanted to see if anyone else got this letter last week on this so you know it's an issue if GM put out notification letters and the heat/AC might crap out.