big66440 Posted June 19, 2015 Share Posted June 19, 2015 Hello, I'm in the market for a new water pump and was interested in the flow kooler high flow pump part number 1748 but its only listed for 91 and newer 4.0's though, is there a difference in the older Renix era water pumps? EDIT ; correct part number is 1747, my mistake. Link to comment Share on other sites More sharing options...
Rockfrog Posted June 19, 2015 Share Posted June 19, 2015 I have the water pump off my 2000 XJ 4.0 block currently cooling my 1988 MJ's 4.0 Renix block. Didn't notice anything different from the one I took off. Link to comment Share on other sites More sharing options...
Crash Posted June 19, 2015 Share Posted June 19, 2015 DO not waste your time with Flowcooler pumps. They are problematic. Either go to your local Carquest, Napa, etc or the dealer. Link to comment Share on other sites More sharing options...
Siopposition Posted June 22, 2015 Share Posted June 22, 2015 ^ this!!! Link to comment Share on other sites More sharing options...
Minuit Posted June 22, 2015 Share Posted June 22, 2015 :agree: If the system is in good working order there's no need for a high flow water pump if your engine is stock. Link to comment Share on other sites More sharing options...
big66440 Posted June 22, 2015 Author Share Posted June 22, 2015 DO not waste your time with Flowcooler pumps. They are problematic. Either go to your local Carquest, Napa, etc or the dealer. Thanks for the heads up, do you know what problems they have? Link to comment Share on other sites More sharing options...
Siopposition Posted June 22, 2015 Share Posted June 22, 2015 I went thru 2. First one the bearings went on me within a couple months, second one I never did figure out what was wrong with it...just wasn't cooling the xj right. I think the fins inside were cut wrong. Went back to a Napa stock on and haven't had issues since. Link to comment Share on other sites More sharing options...
big66440 Posted June 23, 2015 Author Share Posted June 23, 2015 Thanks again for letting me know. Link to comment Share on other sites More sharing options...
75sv1 Posted June 23, 2015 Share Posted June 23, 2015 I think there are two lengths of water pumps or hieghts. At least for XJs. So need to match with the old one or could change the pulley to match. About '03 the bolt pattern changed. As for water temps, don't forget to replace the radiator cap. Might also try a Robert Shaw or I thinm Mr Gasket HI Flow. Link to comment Share on other sites More sharing options...
Rockfrog Posted June 24, 2015 Share Posted June 24, 2015 The change you refer to is also a change in the overall block design. In 2000 the 4.0L block was redesigned considerably rendering it nearly incompatible with earlier vehicles. The mounting positions and filter boss locations, along with the addition of a spring tensioner were among the biggest changes. This change was only implemented on the Wrangler (TJ), and Grand Cherokee (WJ) platforms ... with the XJ Cherokee continuing into its final year with the same base block design of previous years. As stated previously ... the water pump from my 2000 XJ was exactly the same as the water pump from my 1988 MJ and it resides there still to this day. I have had no issues with AC DELCO and CARDONE pumps thus far (I've owned my XJ since 2002, and changed the pump three times twice "because I was in there anyway" keeping the pump as a working spare). Link to comment Share on other sites More sharing options...
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