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check the vacuum diaphragm for leaks. Might be a hole in the vacuum line.
A likely cause is that the front vacuum line is disconnected. My truck would lose 4x4 in mud or snow because the vacuum line pulled loose. Not a real handy feature for a 4x4.
can I put a 99 Chevy 4l60e transmission in my 86 k5 chevy blazer
Defective modulator valve.
sounds to me like your front end is not disengaging, bad actuator under battery.
what all i need to take a water pump on a 99 Chevy blazer what all i need to take a water pump on a 99 Chevy blazer what all i need to take a water pump on a 99 Chevy blazer what all i need to take a water pump on a 99 Chevy blazer
Yes
The AC does not blow on the main front vents. Only rear and defrost.
YES it does.
vacumn line came off on the backside cant find were to put it back on?
Yes
If they are both 4x2 and 4.3 engines then yes it will fit, but it will not wire up the same give that the '91 is most likely a 700R4 and the '99 is most likely a 4L60E. One is vacuum controlled the other is computer controlled.