Have a 2005 grand prix and romantic is running high. It read 100rpm nut it actually running at

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2005 Pontiac Grand Prix ECM 3.8L Engine Computer (PCM ...

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The 2005 Pontiac Grand Prix is usually located in the engine bay on the driver side, on the firewall or near the battery. There are several symptoms of a bad or ...
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check speed sensor and wiring for fault

If it were mine, I'd want to be very sure what it was and so I always use a Repair Manual I can see and read, but that me.

I actually have the same car, and when mine did that it ended up being a cracked spark plug. So I changed the plug and it cracked again. Ended up needing new spark plug wires.

this should tighten when the wheel lug nuts are tightened-Denny

Sounds like you have air in the system. Look for an air bleeder near the thermostat on the black steel coolant hose. It will take some experimenting and patience to get the air out but it will happen.

3/8" hex screw from the inner side of the rotor

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

Problem is the inside blower fan, not the raditor fan. T/S to a bad relay on the blower control modual which had to be purchased from the dealer. $274 later it is fixed.

your thermostat is probably stuck open. does the rad get hot. if this helps please rate me thank joe