I have a 95 bonneville se it has 88,000 miles on it. My problem is the check engine light is on and so is the check gauges light. the check gauges light used to blink on and off all the time but now it is constant. I took it to a shop and they ran the codes and said like 7 or 8 different codes came up. they said it might be the battery so i bought a new one it ran for 5 or six miles then engine light came on again i took it back to them and still they did not know what was wrong. a week or two later the a/c compressor froze up i bought a NEW one from parts store and had the shop install it and charge the system but the a/c still did not work well they had my car for three weeks and they couldnt(or didnt have time) to fix it. i replaced the coolant temperature sensor the one right under the throttle body and still the same.....is there any other sensors or maxi fuses or anything that could be wrong? any reply would be helpfull.....thank you

We need to know the numbers on the codes. Those are critical.