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97 Toyota 4 runner V6 3.4 157,890 miles overheating

Tiny
RAULVIABREGU1
  • MEMBER
  • 1997 TOYOTA 4RUNNER
This truck start to overheating about 2 weeks ago, has been replace thermostat, radiator, fan clutch and coolant system flushing twice and the truck still overheating, we open the water pump but looks ok.
So let me tell you how it does when the engine is cold you can drive for about half hour with no problem, but after that start raise the temperature until red, I notice something when the truck the fan doesn't blow like when you start the truck it's blows a lot air to the engine that's why we change the fan clutch but still the same.
Tanks for answer.?
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Tuesday, September 18th, 2007 AT 11:45 PM

6 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
If you let it sit and idle will it overheat, or just when you are driving? Any obstructions in front of the a/c condensor?
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Wednesday, September 19th, 2007 AT 1:46 PM
Tiny
RAULVIABREGU1
  • MEMBER
  • 4 POSTS
Good question, yes it got overheating when you drive, am not sure at idle but yesterday I let it run for about 30 minutes at idle and no overheating after that I went to test drive and my way back it goes to the red(about 25 minutes. Ah no obstruction in the front.
Tanks for your time.
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Wednesday, September 19th, 2007 AT 11:29 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Possibly a flow problem. First have it chemical tested for a blown head gasket to rule that out. You removed the water pump and looked in it? If the back plate comes off, I would be sure the impeller isnt spinning on the shaft of the pump.
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Thursday, September 20th, 2007 AT 7:50 AM
Tiny
RAULVIABREGU1
  • MEMBER
  • 4 POSTS
Yes, I did puller out the water pump and check the impeller it was tight unless getting loose when is hot, do you think, I'm not familiarized with the chemical test for the head gasket can you give me a idea how is that work.
Tanks.
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Thursday, September 20th, 2007 AT 6:46 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
It is a chemical that reacts to exhaust gasses in the cooling system. Slighthly lower the coolant level (coolant cant directly touch the chemical) with the engine completely warmed up a tube is placed on the radiator filler.
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Friday, September 21st, 2007 AT 7:54 AM
Tiny
BUZZSAW
  • MECHANIC
  • 1,198 POSTS
Head gaskets bad if no coolant loss, toyota may have a open campaing on this call dealer and have VIN ready to give them. If already done once its on you
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Friday, September 21st, 2007 AT 10:32 PM

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