Question about 2000 Dodge Ram 1500 Truck

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Dumping water if the top radiator hose gets hot and the bottom stays cool is that a water pump and thermostat problem?

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Could be a problem but it sounds like the rad is plugged. i would start there.

Posted on Jul 25, 2009

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Posted on Jan 02, 2017

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I've just gotten a 1987 Toyota Corolla and when I run it until it's warmed up, the lower return hose stays cold to the touch while the upper hose gets too hot to touch. Shouldn't both be hot?


indicates a blocked radiator
The fix is a new radiator
no-- it is not a problem thermostat as the top hose will not get hot if the water is not flowing through the thermostat
yes the bottom hose will get hot but will always be 10-15 degrees cooler than the top hose because the water is being cooled down by the heat exchange from the fins of the radiator
If you switch the engine off the the bottom hose will get hotter to equal the top hose as there is no water circulation from the pump

Jan 29, 2018 | Toyota Cars & Trucks

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Runs hot sometimes. Top radiator hose hot, bottom cold. What's wrong?


top hose should be hot, all water from engine goes through upper hose, then radiator to cool and out lower hose.

Jan 29, 2016 | 1997 Pontiac Sunfire

3 Answers

Started running hot,replaced thermostat and still runs hot.Top radiator hose is hot bottom is cold.


Did you put the thermostat in backwards? If you did, it wont open when hot. Thermostats look pretty much the same - with some minor variations. It's important to note the the side with the spring should be facing the (hot) engine and the other side facing the (cool) radiator as shown in the image below. If the spring side doesn't get hot - it won't open to let hot water from the engine flow to the radiator for proper cooling.



25817017-e22e11id3nt023xxjpdtazbf-3-1.gif

Aug 10, 2015 | Cars & Trucks

1 Answer

Replaced thermostat water pump overheating seems to have no backflow thru top radaitor hose


The engine gets cool water from the lower hose. And dumps hot water back in the radiator thru the top hose.

The water won't come your the engine until the thermostat reaches the appropriate temp.

After the thermostat opens and the water level drops in the radiator you can fill the radiator.

May 05, 2015 | Cars & Trucks

1 Answer

2006 CHEVY COBALT OVERHEATING HAS NEW RADIATOR WATER PUMP AND THERMOSTAT


That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.

Oct 26, 2011 | Cars & Trucks

3 Answers

1995 Chrysler Cirrus overheating


Probably not water pump. Engine is notourious for vapour lock.
Cooling system must be blead of air before thermostat will work. Cool bottom rad hose is a dead give away. If you are still watching this forum reply , and I will walk you through the only way I know how to make it work properly. It's actually easy if you do it my way. I have worked on lots of cars , and this engine was the hardest to bleed out. Did one Yesterday , and works perfect.

Apr 07, 2010 | 1995 Chrysler Cirrus

1 Answer

The temp gauge on the instrument panel was


Sounds like the radiator is clogged, have the cooling system flushed, the water pump pumps water into the engine and it comes out the top hose to return to the radiator to circulate through it to cool, if the radiator is clogged the water pressure will build on the top hose, also look at the bottom radiator hose, if it collapses when you rev the engine the radiator is clogged, although sometimes the bottom hoses are reinforced with wire to prevent them from collapsing so just because they do not collapse it does not mean the radiator is not clogged.

Mar 01, 2010 | 2000 Jeep Grand Cherokee

2 Answers

Radiator problems


it may be a little off, but the lower water hose seldom gets very hot,, as its this hose that suplyes the engine with ""cold water"" the hot water comes out the top hose,, drains down the rad and cools on the way down then enters the engine through the bottom hose """if your engine stayes running in the normal place on the gage,,,and not over heating""" why are you spending money for nothing???""
you wont get the bottom hose to run hot unless the engine is cooking

Oct 30, 2009 | 2001 Chevrolet Tracker

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