Hi,

I'm switching over to an CSR electric water pump and Flex a lite electric fan, can anyone tell me if I will can keep my stock radiator in and still keep my temp down or will I need to upgrade to a better 3 or 4 core radaitor, if I do can you recomend any radiators. I have a 1988 K5 5.7 liter. Everything is stock in the engine except for headers, exhaust system and cold intake system, Monster 700R4 trannsmission. Thanks

Respectfully Straka

 

You better get an AD244 alternator (from 04 tahoe for 145amp, 02 tahoe for 130amp version; check car-part.com)

The diesel 6.2 trucks have a bigger radiator that should fit. I've been meaning to snag one from my u-pull-it yard to have for a spare/upgrade..

I'm running an e-fan, but I don't know what to think about an electric water pump for a truck application. Honestly, I would highly recommend against it. Your hp/mpg gains are going to be absolutely negligible at the risk of severely fuqin' up your engine.

Electric water pumps are intended for drag racing applications so you have maximum power at high rpm (>5000). When was the last time you reved your k5 above 4000? Probably never =).

No use for an offroad rig or daily driver, and the life expectancy is shorter than a traditional pump.

 

Thanks for the help, what type of e-fan are you running, are you still running a stock radiator. Thanks again

 

I grabbed a 6.2 radiator last week for cheap. I think the jundyard might have lost money (vs. scrap) because it's so massive. It's about 12" wider and 3/4" thicker, has integrated oil cooler and tranny cooler with factory temp(?) sensor ports. I'm pretty sure it will fit using the wider 6.2 top brackets, but I need to make sure my a/c lines aren't in the way. I intend to use it when I [eventually] build a 383.


For now, I'm running the stock radiator with a two-speed 90's ford taurus (3.8l) e-fan held on with some solid copper wire (don't trust zip ties). I'm only using the low setting so far. I wanted to get 00+ dodge/chrysler minivan dual efans, but pick-a-part was going to charge me double to take both fans...

The big consideration is how you're going to control the e-fan. THere are adjustable aftermarket fan controllers available, but they don't monitor the vehicle speed and I'm not sure how reliable they are. I used a switch wired to a relay for a while, but that kind of sucks (you'll forget to turn it on).


I converted to a 7427 PCM (94-95 tbi trucks), so I now use the e-fan code that's floating around the 'net. It was a lot of work, but I wanted to do that conversion for other reasons, too. I burn my own chips because I have vortec heads (96+) with the GMPP intake, and my motor doesn't run well on a stock PROM.

Link: Converting to 7427 for e-fan control. Note: you have to burn your own chip to use the efan code, it's not just a matter of re-wiring...