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I have a 2008 Pontiac grand prix. The heat doesn't seem to blow as hot as it used to. It comes and goes with waves of heat. Any ideas?

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Check your antifreeze level it could be low fill it and then see if that fix it

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Your heater problem could be a few different issues. If the actual blower is coming and going fast and then hardly blowing it could be the actual blower or a relay switch. If it is the heat that is not consistent it could be the heater core. You may want to take your car to a mechanic for an estimate.

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Could also be your thermostat failing

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dross1958

Low coolant level

Thermostat needs to be replaced

Plugged heater hoses or heater core

Also reverse flush the radiator - it may be partially plugged and reducing coolant flow to the heater core

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