No heat 2007 grand prix - 2007 Pontiac Grand Prix

SOURCE: changing serpentine belt 3.8 2007 pontiac grand

• Make sure your new belt exactly matches the old belt demensions
• Take a breaker bar or big rachet & release the tension on the automatic tensioner; very slowly
• Loop the old belt around the pulleys & fan
• Install new

SOURCE: replaced the therastate in a 2007 pontiac grand

clogged heater core very pop prob. check both hoses to firewall from back of engine pass side to make sure they are equal tmep if not it is a bad heater core you can flush these by removing the hoses and blowing them out with air or a garden hose also check to see if you hear a door closing in the vents when switched from hot to cold if you do it is safe to say itis a heater core

SOURCE: my 1998 grand prix blows no hot heat to defrost

Try replacing the filter between the firewall and under the wiperblade cover under the hood.

SOURCE: I have a 2007 grand prix. The lowbeams work but

This would be the third time I've run across this one. I believe one of your low beam filaments burnt out but you didn't notice it much since you still had one working. When the last one went out this gave the appearance that both suddenly died. Unplug each headlight bulb and check with an ohmmeter for "opens" (high resistance). I'd bet you need to replace both the bulbs.