Only a shop that has a proper coolant recirculating machine (like the dealer) gets it right.
That machine uses vacuum & compressed air, distilled water etc and of course dealer Hoat.
Try another dealer if you have to, but I doubt the Indy shop has the big$ recirculating machine!
Anyways, if you want to compare performance of your heat/system, I took the time to measure dash air temps for you to compare. Outside air temp was 43F.
Using the meat temp probe in
center vent closest to driver, set to recirculating etc see pic below.
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At 20 minutes (12 min driving time) the heat would fry my hand if I got too close!
Had to turn it down big time!