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My 99 gmc suburban is stuck in 4 wheel drice low
low radiator fluid or a possible bad thermostat.
most likely a selector arm is broken
Looking at it the one on the right
vacuum leak,plugs or plugwires,fuel filter,throttle positioning sensor,
The Low side line attaches to the compressor on the driver side of compressor. The charging port faced forward. The high pressure port faces up.
could be a fuse out
your idle settings might be to low. check on your engine near your carb for a small screw that is all by itself
change low beam lite in 1999 suburban
Could be hi-speed fan relay or secondary winding in blower motor
May need new motor low speed winding may be burned out
It is Low on Freon. I have a Tahoe that does the excat thing when my freon gets low..the back will be freezing cold and the front not.