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| - I have to say at Gregs customer service is great. I first requested for a quote on Yelp, and the business owner responded promptly. The communication was done in a very professional way, both online and over the phone.
In the shop, the receptionist as well as the mechanic I met with were both very friendly and helpful. Despite that at checkout the receptionist falsely swiped $1100 from my card (which did not go through) the first time but quickly corrected it, I am very satisfied with how I was treated in the business.
I had my vehicle's air conditioning system inspected and recharged. The mechanic evacuated the system, recharged refrigerant and mixed refrigerant with oil. The cost for the service is not competitive compared with quotes I received elsewhere, but I am okay with it.
The main reason for my dissatisfaction is probably the overconfidence of the mechanic about his experience and judgement. I have air blowing out from the passenger-side vents being warmer than that from the driver-side vents. The mechanic's diagnosis is "stuck or broke mixer door" and recommended labor is "remove and replace mixer door and motor".
The truth is, the air conditioning on my vehicle operates on a reheat principle, not a blend principle like on many other cars. Air is first cooled through the evaporator, and is then heated again in a heater matrix. Temperature is adjusted by directing different amount of hot engine coolant into the heater matrix. On many other cars, though, cooled and hot air are blended through the blend flap/mixer door. Temperature is adjusted by mixing them with different ratio. These are two distinct types of air conditioning systems, and mine does NOT have that mixer door at all.
I tried to explain this to the mechanic, but politely but firmly insisted that he was right. He stated the dash must come out and the mixer door and motor replaced. I have removed the dash and gained access to the heater assembly before, and I can confirm there are six motors: fresh/recirculated, windscreen vent, face level vent, foot well vent, "ram air" and rear temperature blend (NOT passenger side). There is not the blend motor he thought was there.
Finally he said there was nothing he could do if I did not believe in him. I left because I certainly did not want him to waste time on finding a door and a motor which simply do not exist.
Again, the mechanic was courteous and warmhearted, but I would appreciate it if he respond to my insights in a more humble manner. I do not doubt that he is way more knowledgeable and experienced in vehicles in general than I am, but when it comes down to my particular car, what he believes may not always be true.
Myself: Engineer, former mechanic apprentice, owns official workshop manual of my car, worked 200+ hours on my car
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