I would check the front to rear fade adjustment on the radio first. If that is okay, it sounds like the amplifier inside the radio is having a problem and is not working for the front to speakers of the system. If this is the case, I would replace the radiator with an aftermarket unit or a used stock replacement by searching Ebay. Here is how to change the unit out. Check out the images (below). Please let us know what happens.
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Sunday, March 17th, 2024 AT 10:00 AM