Is the fan stuck on or is it just hot air even with the a/c on???
If the problem is that the air never gets warm, it's most likely a stuck-open thermostat. If not that, heater core may be plugged.
a stuck rely. and some time spring in the button on steering wheel gets stuck too
Describe what to do if food gets stuck in an appliance.
because before they were not dim The heater could be drawing too much power or your alternator isn't producing enough.
Silverado 1500 gets 16/21
If a 2000 Grand Am sometimes has the heater blower working and sometimes it won't, the problem could be with the heater relay switch. The heater relay switch lets the heater blower know when to come on and when to go off. In most vehicles this switch is behind the glove compartment. This part sometimes gets corroded from condensation in this area.
a heater
The fuel efficiency of a 2009 Silverado varies greatly based on it's engine size and the features it is equipped with. While the Hybrid Silverado gets about 21 MPG, the standard Silverado gets an average of around 13 MPG.
10-14 mpg is what my silverado gets
Does the fan work? if not, check fuses. if does work, check coolant level first. Next, check heater valve in engine compartment, on fire wall, has ~ 1 inch hoses connected between the engine and to the heater core inside the passenger side. Have someone turn temperature knob inside car and observe cable on Heater Valve is moving. (Can be simple as the screw on top of heater valve loose or cable maybe stuck). Heater valve can be stuck closed. Check hose gets hot between valve and heater core.
i can turn the blower speed on low and the air gets warm , but not hot . then i can turn it to high and it get even cooler Check your thermostat, it may be stuck.
what it it stuck on?