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Running hot , top hose on radirator hot,bottom hose on radirator cold

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Sounds like a bad or stuck thermostat... replace the thermostat which is inside the top hose where it is attached to the motor.. cheap and easy fix.. make sure you put the new thermostat back in the same direction the other one was

Posted on Mar 25, 2011

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Why does my mazda drifter 2.5sleTDI the top radiator hose gets very hot and the bottom hose remains cold after a long trip.


The top radiator hose is were the hot coolant goes into the rad and the bottom provides cool to return.
If you hold your top hose while warmed up and running you can see if thermostat is open you can feel the coolant moving through. careful its hot mike

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

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You need to replace your thermostat its stuck shut and will not allow water to circulate through the radiator.

Jan 11, 2014 | Cars & Trucks

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I have just replaced the radiator in my hyundai elantra 2004 why is the top hose hot an the bottom hose cold


beside this all is good,it is normal hot to the top and cold to the bottom.

Mar 09, 2013 | Cars & Trucks

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Have a Peugeot 406 1.8 petrol LX on a 52 plate. Smell of coolant in the cab, no visible leak, top radiator hose hot, both hoses to heater matrix hot, bottom radiator hose cold. Air con works fine.


it could be a slight leak from the heater matrix (check for damp in the passanger foot well) its self or the thermostat may be sticking this may cause the bottom hose to stay cold. you could try removing the thermostat and running it without it and then putting a rad weld in the coolant system to seal the matrix.


let me know if this helps


cheers big mike

Mar 31, 2011 | 2005 Peugeot 405

1 Answer

Driving on interstate and car started running hot. Heater was working and blowing hot air. Had steam coming from under hood. Top Radiator hose was hot but bottom hose was cool. Could it be a blown heater...


it seems as if there is a clog in the radiator, flush out coolant system and see if this helps.usually when top hose is hot and bottom hose is cold there is a clog somewhere in system. check radiator and make sure coolant is circulating. hope this helps carl,

Dec 12, 2009 | 1992 Honda Accord

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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My VW Cabrio is overheating after 1-2 miles. Coolant in recovery tank is boiling by this time and making bubbling noises. Someone changed radiator hoses, flange, some housing. They are saying that radiator...



Run the engine and look at the header tank , is there lots of air bubbles coming back out of the water if is then the head gasket may have split and that is down to either a can of Radweld or a strip down repair

If the radiator is not uniformly hot them I would go for that as your problem

Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

The stat opens and the bottom hose should get hot as the water from the block is pumped into the radiator for cooling.

The radiator should get hot all over and the cooling fan should kick in when the sensor hits the over limit stop.

If that does not happen then get someone to remove the stat altogether (It is only there to get the engine block warm quickly in cold regions )

In which case the bottom hose should go from cold to warm to hot

Jun 23, 2009 | 1997 Volkswagen Jetta

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