Sounds like your getting help from mechanics and so far it hasn't been to expensive. If your getting knocking during startup and it stops as it warms up, that is usually hydraulic lifters. They can get sticky and not pressurize correctly with the oil pressure. For a mechanic to replace 2 or 3 and not all of them is sort of dumb. Actually it is really dumb. They all should been replaced when they had the engine down. The test with the fan your mechanic showed you was good. It is very good he showed you also what it does. Do you service your vehicle at regular intervals? Change oil, Check water, the normal things will save you repair bills later.
SOURCE: engine fan keeps running
It's possible that the fan control relay is intermittently sticking causing the fans to run continuously. This can overheat and subsequently blow the fuse. Try replacing the relay and see if anything changes.
Hope this helps.
SOURCE: 2004 Nissan Xterra 75,000 miles
I had the same problem recently, but gave me 2 codes knock sensor (which will not activate the service light as i found around)
and gave me the air flow mass sensor. took it out clean it,
change the air filter,with a good one, vacum the inside of the filter holder and light went of about 2 days later.
SOURCE: mechanic said valve lifters need to be replaced
valve lifters make a kind of rattly knocking noise! which sort of follow engine revs.if they are gone you may need a new camshaft as well, best to do itr all at the same time and are sold as a kit.are you sure there is a new noise or are you just listening harder?
SOURCE: rav4 mystery oil leak
time for a new car. You single handedly ruined this motor. Don't waste anymore money on this car, buy another car and do the prescribed maintenance as required. Think of this as an expensive lesson.
SOURCE: overheating fto
make sure you have 50/50 antifreeze and coolant.if its been awhile replace radiator pressure cap and thermostat.
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