Buick Repair Questions? Ask a Mechanic for Answers ASAP
I see, so are you saying that the temperature doesn't change at all as of today but as of yesterday and before, the air conditioning was working properly?
I agree, it is impossible for the cooling system to cause this, because the heat is generated by that system and you are not describing a no-heat condition, it is an only-heat condition :-)
I would tend to agree with you that the problem seems on the surface to lie within the blend door controls...do you have passenger and driver dual zone climate control on this vehicle? also, is it an automatic or manual system?
First of all, I am glad to hear that it is no longer emitting only heat! But, that does leave you with a sticky situation, because you have not done anything to actually fix this problem. I would assume that you are correct in that there is likely a sticking blend door actuator, but that will be nearly impossible to diagnose in the absence of an actual failure. I would recommend that you have the body control module scanned at a local shop (they should do this for free) and see if there are any codes related to this. Codes in the BCM related to climate control will rarely cause the engine light to illuminate but could prove to be invaluable in diagnosing an intermittent condition. I only recommend that you do this if the problem reoccurs...Good luck my friend!