1999 Pontiac Grand Prix Lights Goes Out

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Question:
1999 Pontiac Grand Prix GT.
Question = Initially the L.E.D went out on my radio but it still works. Then the Driver information center stopped working. Now my dual climate A/C L.E.D is flashing very fast in the morning but when I leave work it is out completely. Suspect a bad module or two but I have no idea where they are or if that is even the problem. HELP, all kinds of electrical issues with this car. Need my radio lights.

Answer:
Hello and welcome. The radio light being out may be a faulty radio, but with the other items having problems they may all be related. Try moving the interior light dimming switch from low to full very quickly and several times. You may have a headlight / interior light dimmer switch problem. They can act up and you will see the lights get bright and dim irratically instead of smooth as you turn the dimmer switch. Also be sure to check all fuses.

Another possibility is a faulty ignition switch. The ignition switch supplies power to many of the cars systems. This would not explain the radio problem but it may explain the other lighting conditions. Cycling the ignition several times quickly back and forth can sometimes indicate a faulty ignition switch. You would see things get dim or bright.

2000 Pontiac Grand am 3.400 litre.
Question: Where on the motor would I find the a/c port gauge with the blue cap. I found a black cap and a green cap. I need to add A/C freon to the system because the air is warm from the vents.

Answer:
Any A/C system has only 2 service fittings- high side and low pressure side. The high side is usually red or black, the low side is blue. I think the cap you are looking at that is green is for the EVAP emissions system service port. DO NOT try to put freon on that one. There are other things that can cause your problem. But first you must be sure the freon charge is correct. Just adding to it may not help the problem.

That is used to diagnose the evaporative emissions system if there is a leak. The low side A/C fitting is on a line either near the radiator on the passenger side, or near the firewall where the lines go into the evaporator core on the firewall. It can also be near the upper engine mount on the right side of the car.

Question:
1997 Pontiac ETS and Check Engine Light on when driving. Car runs and starts just fine. No other lights or problems.
What Sensor is bad and needs to be replaced? I have a some mechanical knowledge but just need to know what to replace.

Answer: The check engine light can come on for many, many different reasons. Step one is to have the codes scanned. This can be done for free at most large national auto parts stores. If you give us the codes we can be of more help. After the engine light is fixed clear the codes and see if the ETS comes back on- it may not since many engine codes will turn on the ETS light as well.