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Las Vegas, NV
it could be several issues motor blower, heater core, thermostat,coolant level or water pump. just saying one of these your problem.
the same answer to previous post
check the hoses in/out to heater core
stock radio or after market?
fuel gauge sender unit could be your problem inside the gas tank. temperature is another issue like temp switch, thermostat or low coolant
maybe blower motor getting weak or loose wire connection
seek to diagnose on your local transmission shop
seek to diagnose it like AAMCO transmission
get it scan for codes and post it
could be the thermostat not working properly and not opening if the hose do not get hot.