2004 Pontiac Grand Prix 6 cyl 3800.Question = I need to know how to change the spark plugs. I took the
wires off and only the bottom of the plug showed. Do I need to take the cylinder off?

If you mean that the spark plugs broke, and all that remains is the lower portion, then no you do not
need to remove the cylinder heads. You will still be able to get a socket on the plugs, as the lower
portion has the fitting for a socket. See this link for a pic of a spark plug.

2003 pontiac grand prix still overheating.
Question: My car started running hot about three weeks ago. Heater would work on and off. Checked
water and had oil in it. Replaced intake and head gaskets. Flushed Radiator. Ran fine for day or two.
Started running hot again. Heat did not work at all. Changed thermostat. It was stuck. Flushed again.
No change, still running hot.

Replaced water pump. No change. No oil in water, heat still not working even after new thermostat. Can
idle for a while but when accelerated or tr to drive it instantly begins to run hot. Not sure what else to do.
Any advice would be greatly appreciated. Thanks

You've covered just about all the bases there, and with most of the parts that have been replaced, there
can only be a couple things left that are causing your problem. Depending on how hot the car got, you
could have warped or even cracked the cylinder heads. Just replacing the head gaskets wouldn't fix the
problem, and this would lead to an additional overheating problem.

If the heads weren't checked out properly for cracks or warping during the repair, you may have to take
them off again to get that done. Sometimes it's just a small amount of warp or the tiniest crack that can
lead to big trouble. Since you stated that you had oil in the coolant at first, I would definitely be leaning
towards a problem like this.

You could have even cracked the block if it got real bad. If there is enough damage, you will probably end
up needing to replace the engine.

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2005 Grand Prix Overheating- Head Gasket Replaced