Before you start the engine see if the fan will turn freely and not wobble. If it wobbles or doesn't turn it isn't any good. First though, are you sure it has a fan clutch. That would be pretty rare on a 65 model. To make sure check the front of the fan and see if it has a large aluminum piece on it. If not you don't have a fan clutch. Now assuming you do have a fan clutch and the fan shroud is still in place drive the car until it is at operating temperature. Shut the motor off and check the fan. It should only turn a couple of times before it stops when the engine is at operating temperature. Good luck.
Start the engine and drive it if possible and get it hot. Then open the hood and watch the fan turning, then turn the engine off and the fan should only turn about 2 times at the most after engine is HOT and then turned off. If it free spins several times then the fan clutch is bad. Replace clutch.
If it is an electric fan, NO. If it is a mechanical fan test it to see. If you can turn the fan by hand with the engine not running it has a clutch.
It is designed to free wheel until the engine reaches running tempture. The way you check the fan clutch is make sure the engine is hot, norther words go and drive it a few miles, then come back and leave the engine running, open the hood then stand somewhere where you can see the fan turning. Then turn the engine off and the fan blades should only turn about 1 time as soon as you turn engine off. If the fan spends several times then the fan clutch is bad. Replace fan clutch. Just be sure the engine is hot when you do this test.
Clutch slippage can cause an engine to overheat by running the engine at higher rpm's than what it is recommended for the motor. Excessive heat in the engine can cause the head gaskets to leak building up heat in the motor. There are inexpensive kits to test whether your headgasket is leaking or not.
You can run a diagnostic test for the knock sensor, on your 2005 Chevy avalanche, by hooking the engine up to a diagnostic tester.
Find the clutch fluid reservoir and take its cap off. Look under the dashboard to locate the stop-nut. Loosen the nut and set the pedal where you want it to be. Tighten the stop-nut and test the clutch pedal.
Screen Test Paul America - 1965 was released on: USA: 1965
Screen Test 2 - 1965 was released on: USA: 12 June 1965
It is very easy to test your car for a worn clutch. Driving on road put 2nd or 3rd gear, push all way down accelerator pedal, car will not run as it should, only engine will speed up its rpm. This means clutch fiber is worn; traction has been lost and clutch disc should be replaced.
loping idle. does not maintain idle, sometimes shuts engine off. do an ohm test.
check fuel fliterthen test fuel pump
step on the clutch and hold it to the floor clutch should stay disengaged for as long as you hold it down