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You don't mention which GLA model and year, nor location (Pep Boys sounds like US), but you report symptoms of a sticking thermostat. However, our GLAs, and MBs in general, also have a tendency at times for bogus sensor readings for a number of various reasons. Is your GLA still under warranty? Perhaps the best option for hopeful peace of mind is taking it to an MB dealer to determine if any error codes are in the recent record, and also to ensure MB-approved parts are used if necessary.
Gla250 2016 I took it to the dealer and they said they found nothing. As I was still under 50k miles it started doing it again now it is doing it daily. I am unhappy because I brought it in and have video of what it does. I am about to take it back tomorrow and I am hoping they have it all documented. I really like this car but I am worried all the time now that something will go wrong
 
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