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HEPU always gets thumbs up on this board. Additionally, I found that the original pumps on my cars were all HEPU, whereas the replacement pumps sold at Volvo dealership parts counters are not HEPU. Given it takes so long* to wear out the OEM pumps, to me these are strong arguments to stick with HEPU.
[ * I'm still on the original on my '84 with 224,000 miles which always got new antifreeze every other year, although I have changed them both on my two '93s that I bought more recently.]
About your disappointment with your HEPU, there's a notorious caveat -- you can easily and quickly ruin the bearings of any water pump if you have too much belt tension on it. And, IMHO, there's a fine line between too little and too much -- you really have to observe the tightening criteria in your green book, and if you find that the belts are still noisy or slipping, instead of tightening it further (assuming it seems to be tightened properly), you should just consider replacing the belts with new ones, something a lot easier than replacing a prematurely failing pump.
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