water tempature

2003 TOYOTA TUNDRA
75,000 MILES
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LPEEK
  • MEMBER
  • 55 POSTS
I replaced the water pump and thermostat 3 weeks ago. While checking I noticed that the bottom rad hose was not hot, the top hose was. I had drove the truck for a half hour or more. The gauge reads in the normal range the heater is warm, but I am concerned that the coolant is not circulating even though the engine is not running hot. I installed the thermostat with the jiggle hole down as the instructions read. what are your thoughts on this.
Nov 4, 2011 at 5:14 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
the top hose is always hot. it then goes through the radiator to cool it down. that is normal an dnothing to worry about
Nov 4, 2011 at 7:33 PM
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CADIEMAN
  • ✓ASE Certified Mechanic
  • 3,544 POSTS
  • ASE Certified Mechanic
remove the radiator cap and the top hose atv the radiator
Nov 4, 2011 at 7:40 PM
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CADIEMAN
  • ✓ASE Certified Mechanic
  • 3,544 POSTS
  • ASE Certified Mechanic
get the water hose to keep the radiator full.when the thromastate opens the hot water comes out the hose.then it pulls cool water from the radiator.it will keep doing that cycleing.this will answer the question about cyculation`then just put the hose on.
Nov 4, 2011 at 7:58 PM
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