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cooling fans not comming on when engine temp is over 250 degree. should i replace fan relay switch or temp sensor?

how to test the relay and temp sensor?

Q. 1)Car runs rought (HESITATES) in idle, sometimes smooths out after driving, usualy it dont. It does little less hesitation in traffic light idle. Sometimes it smoothes out after turning the airconditioner on, however the dealer chkd compression test ok, no chk engine light on. Car starts right away. They think it a gas issure that's used in winter & was told to try end of june gas. They also think it could be a leaking valve or FI (cleaning). The compression test was very good. I used Techron & Lucas didnt help. changed gas stations didnt help. did tunup, air filter didnt help. they said the hesitation is not from fuel pump. I do have a slight leak from R-Valave Cover. Accelaration is good????? please let me know.
Q. 2) Noise (clunking) from R-Upper Rear Shock area, over small bumps: lower R-R suspension components are very tight. HOW DIFFICULT IS IT TO REMOVE THE R-TRUNK PANNEL FROM THE INSIDE, SO I CAN SEE WHETHER IT'S THE UPPER SHOCK MOUNTS OR BUSHINGS OR IS IT THE AIR SHOCK. HOW DIFFICULT TO CHANGE THE AIR-SHOCK??
ANY HELP WOULD BE GREATLY APPRECIATED!!!

I was told that my transfer case may be failing (trans issue?), due to the truck "shuddering" and shaking in turns, moving forward or in reverse. In a straight line (forward or reverse), it does not shake.

2003 Monte Carlo

Just need to know which solenoid is which, how to tell because there exactly the same .. 2002 isuzu trooper 3.5L 2wd

No play, no sign of any trouble.

Ac compressor needs to be replaced

Started getting bad gas milage, then acted like it was running out of gas. Finally wouldn't run at all. (over period of approximately 1 month)Completed full tune-up/oil change,wires, rotator cap/button, gas filter, Mass air flow replaced as well as temp. sensor, removed cat. d/t stopped up. Vehicle will start but doesnt idle, smells rich & has NO power when driving. Occasional backfire.NO check engine light. Where do I go from here?

thanks for your help

2.0L 14 SFI engine Neon SXT

I have replaced both cam and crank sensor, because of po340 code. Has new battery, also. Car died while turning right. I can hear the fuel pump humm for about 1 second when I turn the key.

I saw a note you had to loosen moter, is this true?

Always has been about 2 degrees too high. Now it is 5-10 degrees off, usually high. I removed the sensor, cleaned the contacts, but does not seem to help. Can it be adjusted?

ENGINE ONLY FIRING ON ONE SIDE