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I have a brake fluid leak on a Chevy truck silveraldo
Buy a new truck.
By removing it and replacing it with a bran new one.
Replace it.
Probably needs lubrication and the control cable adjusted
You will have to replace it. The bearings are worn out in the blower motor.
Start with replacing the thermostat.
replace cat
change your o2 sensor
I've got a better question, why is this question in the Chevy venture forum ?
Replace the high speed relay.