You do not mention the type of noise rattle , squeal , rumble , grinding so any answer is a guess
the only noise from a crankshaft pulley would be a squeal/scream from a failed harmonic balance rubber insert
when the ac compressor is engaged the extra load on the pulley would make it slip on the rubber
however as the ac compressor would not be driving long before the crank pulley came apart I suspect that the mechanic was not experienced enough to advise correctly
suggest that you get a second opinion from an accredited professional ac specialist
SOURCE: 2003 honda accord air conditioning
replace the black relay between the 2 blue relays in the fuse box. cost about 5 bucks.
SOURCE: engine revs up and down during idle
Well I know that on some vehicles, a vacuum leak will cause this. Since you have a vacuum line going into the brake booster and you might need to remove it to get the the Master Cylinder, it could have cracked, broke, or got pulled out and not back in. A vacuum leak will will result in un-metered air,so now you have a lean mix in the intake. The O2 Sensor will sense this after the burn and try to compensate to bring the emissions back into spec. The computer will try to adjust the RPM to see if it can get it under control. Once it does it relaxes thinking the problem is solved, RPMs drop and it tries to compensate again.
Check for a Vacuum leak, thats my recommendation.
SOURCE: Have a 1989 Honda Accord
If you can keep the engine running with your foot on the gas at a stop it is likely to be the Idle control valve. Older Hondas' have 2 valves. fast idle control (which is prone to cause fast, or surging idle due to vacuum leakage) and the Idle control that takes over from the cold idle control once warmed up. They are located at the throttle butterfly assembly.
SOURCE: 2005 Honda CRV A/C problem...
you will need new radiator fans if your car heats up to past half way on the temp guage and the fans do not kick in.
(also, check the fuses for the fans)
SOURCE: Crankshaft pulley slows down when a/c engaged.
sounds like the harmonic balancer might be broken.there is a rubber "sandwiched"in between the inner and outer rings of the harmonic balancer.the balancer has a large bolt in the center that threads into the crankshaft,sometimes the balancer has the "ribs" already built in where the belt(s) sit or sometimes the belt pulley will bolt onto the balancer,usually with 3-4 bolts.but get the alternator load tested by a mechanic first since you mentioned its not charging all the time.also make sure the belt is tight enough to not slip under load(ie. when you put the rear defogger on along with the high beam headlights,etc.)if you hear a screeching sound when you rev up the engine it could be the belt needs tightening or replacing or spring loaded belt tensioner need replacing. hope this points u in the right direction.
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Place the crankshaft pulley bolt removal tool over the end of the crankshaft bolt. Tool will hold the pulley in place while you apply torque to the bolt with an impact wrench. Start the air compressor by plugging it in and turn it on. Set the pressure of the compressor on the highest setting. Attach air hose on the air compressor to the air inlet and the locking mechanism using the quick-connect lock on the end of the air compressor hose. Set the impact wrench to turn counterclockwise. Spray the crankshaft bolt with penetrating oil. Make sure you soak the bolt head in oil so that it is easier for the wrench to remove. Secure the socket end of the wrench to the pulley bolt and pull the trigger on the impact wrench. You might need to reapply penetrating oil several times during this process to loosen the bolt up. Eventually, the bolt will come off 215 lbs torque, and simply stated righty tighty, lefty loosy. Hope this will assist you.
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