04 gmc yukon heater problem, heater turned on heater warm in car,and when driving car only , cold air come in under dash on rt side floor board. stop car cold air stops also.
Check your radiator fluid level, if it is low it is a good chance your heater core or the hose to the heater core has a leak. The heater core is a small version of a radiator which has the air from the blower blow across it to force warm air into the cabin of the vehicle. You will need to probe under the passenger's dash to locate the leak.
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