( not sure if this makes a difference ) - my exhaust broke & i just today got it fixed . now my heat wont work .
i have very little knowledge about automotives & dont really trust anybody i know bc it seems like every person that " helps " me fix my truck , breaks it even more .
Ask your shop techs if they did anything that might affect the Mazda’s cooling system when they repaired the exhaust system. That’s where to begin.