Quote:
Originally Posted by TA-71
I am using a vacuum pump hooked to a rubber grommet that is pushed into the neck of the pump tank. I can pump it up to almost 28 inches of vacuum, which should help to pull the air out of the system.
I’ve done the vacuum pull with the engine running, when I get over 26 inches of vacuum the pump will start to squeal, signaling that it has air trapped somewhere. The vacuum will hold steady, so I know there is no other air leaks in the system.
I checked the belt and it is as tight as I can get it.
The fan clutch seems ok, but I will have to double check it’s operation.
I am at a loss
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it may not be a tightness issue on the belt, could be the wrong one for the pulley or its glazed over from previous slipping... or the pulley is out of alignment with the crank pulley. can you post a side pic showing the pulley alignment?
sounds frustrating but i dont think its a air issue, when doing the initial bleed you should be able to tell if there is air in the fluid by either seeing bubbles as you do the lock to lock of the wheel, or when starting the engine there will be frothing or aeration of the fluid. if you dont see any of that i doubt a vac pump will help anymore.
all i had to do on my new pump or resurrecting an old dry GM pump was to fill with fluid then turn the pulley backwards by hand or with a drill at lower speeds, i could see some air bubbles in the fluid, i cant say for sure where i heard to do that, might have been in the instructions with the new pump or a mechanic friend told me.
then i did the same in the operation direction for a bit. then turned the wheels lock to lock 6 or 7 cycles checking the fluid level like when bleeding brakes, dont let it get to low & suck in more air.
then did a couple cycles with the engine running, the first few times the pump made a bad noise & the wheel was a little jerky but that cleared up pretty quick. when shut off the fluid was very aerated, i let it sit overnight until it cleared up, topped off the fluid & started the next day & put the car on the ground & it has worked great since.
cant rule out a defective pump either, have heard of some remans being defective. my reman pump didnt come with the inlet fitting, had to swap one from my old pump, it was pretty gunked up too & i had to clean it out before installing. just some other things to consider.