Dear Car Talk: I have a “no heat” problem on my ‘99 Pontiac Grand Prix SE 3.9 liter. It runs fine with no overheating (yet). I suspect a plugged heater core and want to bypass it for the rest of the ...

DEAR CAR TALK: I have a "no heat" problem on my '99 Pontiac Grand Prix SE 3.9 liter. It runs fine with no overheating (yet). I suspect a plugged heater core and want to bypass it for the rest of the ...

so If I read this right, your blower is running but the air is cold... right? You could have a clogged heater core, an air pocket trapped in the core, or perhaps your HVAC blend door is stuck.

I have a “no heat” problem on my ‘99 Pontiac Grand Prix SE 3.9 liter. It runs fine with no overheating (yet). I suspect a plugged heater core and want to bypass it for the rest of the summer. Will ...