I purchased a used 2005 A4 back in January and noticed upon driving it off the lot that there was no heat. Audi took it back and said they'd flush the heater core. Picked up the car a few days later... heat was good to go. The car has mostly sat in my garage but is now, a few months later, becoming my daily. I popped the hood the other day and noticed the "coolant" was low... also noticed it was clear rather than pink like G12 should be. Long story short, took the car back in to the dealership today and the tech, who seemed seasoned and nice enough, came out and said "its not G12, its the CLR we used to flush the heater core." He then acted like all that needed to be done to bring the "coolant" up to a normal level was to just add water. Has anyone ever heard of a dealership intentionally running f**king CLR instead of G12. To me it seems like someone missed the step of flushing the CLR after the heater core flush was done and adding G12 back to it. And knowing the corrosive nature CLR, it seems to me like it could do damage running through anything other than the heater core not to mention left in the core for a prolonged period of time... which it was.
Anybody have any thoughts here?