Lound huming noise whrn cold then goes when warms up
Duplicate question.
SOURCE: Air conditioning fan makes loud noise the faster you ru it.
Concerning your broken vent -- this can be caused by a broken linkage or a malfunctioning servo motor as well. these vent have air ducts the sway back and forth to adjust the dual air flow function. if the servo o linkages are malfunctioning or not connected for some reason, it will not allow total control of the air flow and temperature range. Now, if you have a combination of a flow error and temperature error as well, thai can be caused by a combination of the two.
In this case, you will need to inspect the linkages as well as the servo motor function as well. in addition, i would test the air temp sensors for there operational value. they control the temp when you adjust the coll or hot function.
Concerning the Loud noise coming from the blower fan---
This issue can be caused by a misalignment within the blower housing or, it can also be caused by some minor damage within the motor itself, causing it to rotate in a erratic manner, in return, forcing it to rub against the housing itself. the best solution here is to extract this blower fan housing and inspect for lose fan propeller and motor stability. replace parts accordingly.
PLease rate and have a great day:)
SOURCE: engine noise when cold but goes away when warmed up
That is oil not getting in the motor. go with a light high mileage oil my want to use some marvel mystery oil to keep the walls slick.
SOURCE: Cooling Fan Spinning Fast On A Cold Start
most fans are clutch fans and they work or are engaged by temp.most all will spin under really cold conditions.this is normal.but to be sure, with the motor off and key in your pocket grab the fan and see if it wiggles or has any slop. if not alls good
Testimonial: "Although his response was very brief, it was helpful."
SOURCE: ticking when cold
It could also be the infamous "Piston Slap" common in 1999-2002's.
GM
"standardized" pistons or something like that and they did not fit the
cylinders tight enough. The pistons "slap" the cylinder walls and make a
tapping sound for the first few minutes until the pistons expand to fit.
GM would not fix it and says it does not hurt the longevity of the
motor ( yeah ri--ght! ) Do a google search for piston slap.
Oil level would help if it is a lifter ticking but will do nothing if it is the pistons slapping the walls. My 02 silverado has been doing this since almost new and the above description is straight from GM and a few visits to the dealership while under warranty.
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