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Water tempature

Tiny
LPEEK
  • MEMBER
  • 2003 TOYOTA TUNDRA
  • 75,000 MILES
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.
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Friday, November 4th, 2011 AT 5:14 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The top hose is always hot. It then goes through the radiator to cool it down. That is normal an dnothing to worry about
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Friday, November 4th, 2011 AT 7:33 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Remove the radiator cap and the top hose atv the radiator
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Friday, November 4th, 2011 AT 7:40 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
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.
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Friday, November 4th, 2011 AT 7:58 PM

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