Scotty
My 2007 Buick Lucerne CX V6 , no heat on passenger side, cold AC is fine.
Remove glove box, I adjust mode and temp, I can see mode actuator and blend door actuator moves, and pry to arm, manually turn blend door, seem it moved no stuck, I put them back. check the heat core inlet and outlet pipe, seem both hot.
Suspect heat core clogged, flush with water, then vinegar one hour, also with 7psi air blow, SOME improvement, but still not as hot as driver side, this is really confusing. may I use stronger flush fluid? (I tried Prestone AS105 Radiator Flush and Cleaner ,22oz,does not work at all.
Could you suggest some thing, this is reallly stuck and strange issue
Well, you could try some more flushing, but sometimes those things just clog up inside and you'd have to replace the heater core which is a pretty expensive job. I say. Let your passengers be cool while you get warm. You're driving the car
I've never tried it but I've heard of people using CLR to clean them.
