1. I have 1995 buick regal 3.8L V engine. In August the antifreeze leaked out and the temp gage went very close to the red. I stopped in time and my amateur buddy replaced the water pump.
Now if I am in traffic jam the gage starts going up and as soon as I put the heating to high and the fan at top blast the gage goes down. OR if I do 2 or more short stops and start the gage goes up and I start the heating and it goes down. What is the solution and how much should it cost?
2. At the same tinme my buddy replaced the spark plugs. The last spark plug at the back was difficult to replace. As soon as I started the engine we could smell oil burning but it went away.
But after that whenever I go at 80KMpH (50MPH) I hear a noise like a tapping on a drum(hard to describe). Noise comes on if I try to accelerate too quick or try going up a hill. Otherwise the car is very smooth. Are the 2 problems related? What is the solution to this one and what will it cost? Can my buddy fix both of them/