Originally Posted by
foama
We know some Mirage heat exhanger cores have already become fouled-up with gooey gunk, and we know it comes from chemical reactions from parts reacting with coolant.
For those who haven't been following Doax's heater core saga, it sounds like Mirages might be experiencing the same heater core restriction problem that is affecting some VWs. Here's a VW TSB explaining the issue. The symptoms sound amazingly similar to what some Mirages have...
The PH level should be around PH 7.5 to PH 9.
So did you check the pH of your used coolant?
I think this is a great idea, especially for new Mirages...but I'm not touching my factory coolant because I know my heater core is well on it's way to being internally restricted already (a simple test of the heat output temperatures will tell you this). By this time next year, I expect my heater to be mostly ineffective on cold days...which is when the car will go in for a new warranty heater core.
I can only assume at this point that their is no easy flush remedy for this problem. If there was, I would think that VW would be doing it instead of telling dealers to just replace the heater core in affected vehicles.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)