R4 compressor knock
 

guys,
today i had a brand new compressor, accumulator, orifice screen, oil and freon installed in my 1990 k-1500 4x4 with 5.7 v-8.
its cooling fine, but i still notice somewhat of a slight knock when the compressor is turned on.....even increasing when i up the rpm's, obviously........nowhere near as load as it was before he put the new compressor in..... is it normal for the compressor to make a slight knocking sound ? i dont have another vehicle to compare it to. .... is the slight knock always present on these R4 type of compressors in my 1990 ?
thanks for the help guys.

leonard

Re: R4 compressor knock
 

Usually knocking is bad, did you put enough oil in it when you installed or just what was in the can?

Re: R4 compressor knock
 

i took it to a garage thats been there for 30 years... i hope the mechanic did everything correctly, like the oil in the freon.....

Re: R4 compressor knock
 

Been there long or not doesnt mean they did a good job. Not saying they didnt but for it to have a knock and draw your attention means something is wrong. They could have replaced everything and charged with all the correct stuff but if the compressor went down before and the system had trash in it and they didnt flush it out then it is pointless to throw new parts on it because the trash will kill it again.

Re: R4 compressor knock
 

thanks man...... supposedly they did everything.. hopefully the right way. i do have a one year, 12k mileage warranty, so that good.... im always a little leary when getting something fixed and i didnt do it, and im always listening for problems. hope its nothing... thanks for your input, and also, you got a killer truck man, love it.

leonard

Re: R4 compressor knock
 

Hope you get it squared away and working right.

Hey appreciate it.

Re: R4 compressor knock
 

took the truck to the mechanic who fixed it 4 weeks ago. he said yes, the compressor is knocking more than it should be and will replace it free of charge.
BUT he is gonna chase down a Delphi compressor and install it. he said they are hard to come by, for some reason.
but it will be fixed soon....
leonard