Over-cooling in Texas summer heat wouldn't be a problem...I was always trying to achieve just that effect, whether on my daily drivers or my drag-racers. Especially on my pickups, which were dual-use, daily driving and towing.

Over the years, I tried "high-perf" water pumps (such as they were, not many nor actually hi-perf), and found name brands with quality control problems (seals, shaft run-out), so I always added supplemental electric fans whenever and wherever I could, even on my wife's old '92 Olds Achieva SC Quad4, '88 Pontiac Fiero 4 cyl., and her '85 Chrysler Lebaron 2.2L turbo (she had this thing for oddball cars). The combination worked in stop & go traffic and in long staging lanes (both in <100F).

If I'm not mistaken (my memory isn't what it used to be), both my '98 GMC and the 327 c.i. engine I used in my Chevelle in the late'90s (on a furniture dolly in the garage, unused for 22 years) each sport Stewart water pumps.The one on the GMC was installed by its' previous owner in 2005, before I bought it. Good pumps.

However, there have been exceptions to adding a hi-perf water pump and a supplemental fan to my vehicles (not counting the 3 air-cooled VW's I had in the early
70's):

• 1) I used a 55 gpm electric water pump on my last two racing big block Chevy engines, as they could be switched on/off as I wished. I had two radiator and one transmission radiator fans (dedicated radiator/fan combo, placed behind a deleted headlight) on them, as well.
• 2) My '04 Chevy 2500HD WT, with a mechanical fan cooling the 6.0L, has never given me a hint of overheating, though it has endured the heaviest duty, and heat. I love that LS engine.
• 3) Our '08 Cobalt and '09 HHR Panel, both with Ecotec Gen 1 engines. The factory fans have kept our daily drivers cool (unaided by extra fans) for nearly 300k miles (added together). Then single overheat episode was after I didn't burp the air out of the HHR after re-filling, and it got to 242F just as I got to the house. No damage, though.

As for my X5, the first thing I repaired/replaced was the cooling fan. I removed the mechanical fan and installed a 3000 cfm electric fan. I didn't get an accurate temperature reading for the coolant while the mech fan was still on (I took off the old fan with broken blades before I had driven 10 miles), but the new electric fan always keeps the M54 cooled to 194F (+/- 3 degrees), at all times. Whenever I get around to a new water pump, I'm gonna get the Stewart, for sure. A perfect combo, IMHO.

__________________
01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide