Overheating

1990 CHEVROLET BLAZER
2,017 MILES
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RUBENVALDEZ
  • MEMBER
  • 2 POSTS
installed crated 350 cubic inch engine in my Toyota now it is overheating changed thermostat, water pump, installed external radiator (small like a heater core) to help the radiator, did not work. checked head gaskets okay, no leaks in system. I have installed a 15" electric fan 2450 CFM low voltage 9.5 amps, but I am wondering if the radiator is too small the one that is on there measures core 2" with a 3" tank x18" high, 21" wide, two core, side tank top inlets 1-1/2" bottom 1-3/4". I am thinking maybe the radiator is too small. should I put a bigger radiator with two small electric fans both with 2350 CFM's each?
Jan 29, 2018 at 4:45 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
yes, the radiator is too small. You will need a bigger radiator.

take the temp of the upper part of the radiator and then the lower end. the temp should be almost 1/2 of the upper temp

Roy
Jan 30, 2018 at 1:57 AM
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RUBENVALDEZ
  • MEMBER
  • 2 POSTS
should I install the two 10" electric fans both producing 2350 cfm each?
Jan 30, 2018 at 2:31 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
with the correct size radiator, no. are you running a mechanical fan? If not then just use one.

Roy
Jan 30, 2018 at 2:59 AM
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