the noise is under the hood on the passanger side fire wall i think it is a sollinoid valve. what is this part called and what does it do

I have checked all the fuses and breakers, all are good. All the rest of the panel lights work. There is a humming noise that is coming out from under the dash. It is related to the the dimmer control for the head lights, the noise gets louder with the brighter the dimmer wheel is set. Pulled the headlight switch and all looked good, what's next??

They both have a 3800 motor

I am looking to just get rid of it really, and don't want to put it out for garbage.

engine starts fine idles fine for about 2-3 min then idles erratic and sputters out tail pipe have replaced almost every part on engine. running out of parts to change. manifold will glow red with or with out converter and exhaust hhoked up have installed new dist and timing is correct 0deg per gm manual.

The coolant leaks only when the engine is on. Looks like it is behind the water pump but hard to see exactly. Coolant smells a little like it's burned. Car running rough. Water pump or a gasket?

LOW HEAT Some said it's the ACTUATOR not openjng the BLEND door. Checked everything else

what would be a good fix for this problem

Lexus RX300 1999-2003 Diagnostic in Advance Auto Parts show P0021 Camshaft Position Timing Sensor need to me replaced.
Misfire P0300,
P0304 CYLINDER 4, 5 AND 6

Symptoms: While driving in about 60 mph feels like transmission does not switch correctly it idle a little then shift like a punch. Never happens before.

If idling on tachometer show less then 1000 rpm and not stable car shaking, rpm move up and down.

I bought a new battery and alternator and the voltage gauge says its not getting any voltage

I drive car for a 30 minutes and shut off. When I go to restart you have to give it the gas and it takes a few attempts before it starts. The service engine lite is on constantly and I checkedcodes and it says it is a emission vaccume.

Drving down road. puff of black smoke came out exhaust. Got home and strong smell of oil from exhaust. Engine now hard to start. What could it be and where should I start looking. Thanks

I was given a new one.What is the procedure for programing for my car? ..Something like turn the ignition key on and off seven times?

it shakes hard and I want to know if its the fuel system or a blown head gasket

there is not air comingfrom heater. the fuses are good and no air at all hot or cold