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The first thing to do is check the fuse. Look in your owners manual for the location. Testing the heater switch may require removal or partial dis assembly of the dash. The relay is located behind the left side of the dash.
If everything worked before replacing the battery and alternator, that's the place to start. If the starter just clicks, that would indicate a poor connection at the battery. Remove the battery cables, clean the terminals with a wire brush, baking soda and hot water. Then reattach and try it again. On GM battery cable ends, you must peel back the rubber insulation covering the metal part of the cable end to clean.
High CO readings means it is burning too much gasoline. Emissions diagnosis and repairs are easy for a qualified repair shop. Check the emissions repair booklet that the emissions station should have given you for a reputable shop near you. Look for a shop that has a 95 or better score. That means they can fix your problem. Make sure the shop will get your car retested after they make the repair. That is your assurance they can fix the problem.
The wiper park switch is inside the wiper motor. Swap the wiper motor with one that you know works. If the problem goes away, the motor is bad. It could also be that the wiper arm on the side that had the loose not is positioned incorrectly and not allowing the motor to reach the park position. Remove that arm completely and try the wipers again. If it works, leave the key on, turn off the wipers to allow them to park, then reinstall the arm.
This truck does not have a fuel pump switch. The fuel pump is activated by a relay under the hood. Fords also have a trip switch located in the back of the car that tuns off the fuel pump in the event of a rear end collision.
If the only thing the belt drives is the AC, no it won't hurt anything. If the bracken is cracked, I would suggest getting it replaced. You may be able to get a good used part instead of buying a new one.
If your car is a Subaru, the wash attendant probably flipped the rocker switch located on the top of the steering column, between the steering wheel and the dash. If your car is not a Subaru, it is possible the car wash got the lights wet, and when you turned on the lights the fuse blew. Have the fuse for the park lights inspected. If the park lamp lens is cracked, that is how the water got the bulb and socket wet.
A knocking noise from the engine that increases with engine speed may be a connecting rod bearing. If that is the case, major engine repair is needed. If the engine has many miles, repair may not be cost effective.
Without a doubt noises are the hardest things we are asked to find and fix. There can be many things that cause noises. If the noise started after installing bigger tires, first put the old tires back on and see if the noise disappears. If it does, the offset of the rims or tire diameter can be the cause. If the noise is still there, rule out the tire changeover as the cause. Stop by and we'll go for a ride and make a suggestion. That is the easiest way to help figure it out.
The next thing I would look at is the amount of current the starter is drawing. If the starter is not functioning properly, the engine will turn over slowly. Also test for excessive resistance on the battery cables. Many times a loose or corroded connection can cause slow starter operation. Once you get the engine turning over normally, then focus on the other causes of the engine not being able to start.