Question about 1994 Nissan Sentra 4-Door

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Top radiator hose hot bottom hose is cold - 1994 Nissan Sentra 4-Door

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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old marine
  • 2005 Answers

SOURCE: seized thermostat

Not always. If you have a KA24E (2.4L 4 cyl) engine, the thermostat is located where the lower hose connects to the engine. I have had to change mine. It's easiest to get to if you remove the power steering pump and set it to the side. The thermostat housing is directly below where the PS pump mounts.

Posted on Dec 12, 2008

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  • 19 Answers

SOURCE: temp gauge over heating no heat through vents cold

You will need to bleed the air out of the system there should be a bleeder where the top hose connects to the engine

Posted on Dec 06, 2011

davidkay61
  • 23 Answers

SOURCE: running hot

Radiator Fan Control Relay Switch. I bet your electric fan doesn't run?

Posted on Dec 01, 2008

  • 1779 Answers

SOURCE: I have a 05 Nissan

Hey iisha, although obvious, 1st thing to check is the coolant level. If it's low, the engine will run hot and the low level prevents coolant from circulating to the heater core inside the car, so the result is little or no heat, but engine running hot situation. The top rad. hose takes hot coolant from the engine, it flows down thru the radiator where it is cooled (w/ help from the fan) and the coolant returns to the engine at a reduced temp. to keep the temp under control, and it's returned thru the bottom hose (the result is the bottom hose should be cooler thant the top. There's more involved than that, so 1st check your coolant level, if it's ok let me know I'll help further. Hopefully the fix is that simple, and it is a rather common problem.

Posted on Dec 08, 2008

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1 Answer

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

Feb 19, 2016 | Mazda 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

1 Answer

Top half or Radiator is hot while the bottom half remains cold . Is this normal


This can be due to one of a few different things...First of all, water flows from the engine to the bottom of the radiator, using the water pump and gravity, and the water returns from the radiator back into the engine on the top side.

Thermostat isn't opening...this causes the water / antifreeze to remain in the engine, and not flow through to the radiator. If the water / antifreeze gets hot enough, it should activate the thermostat and water should flow into the radiator through the bottom radiator hose.

The bottom radiator hose is either worn out (there is a spring inside the length of the bottom hose. it is there to keep the hose from collapsing under the suction pressure during normal use) If the hose feels spongy, soft, or shows signs of cracking, replace it.

The radiator may be clogged, preventing the water from flowing freely through all of the 'fins' in the grill section of the radiator. Hot water usually isn't just in the top section during a clogged radiator situation...

Jan 09, 2015 | Cars & Trucks

2 Answers

If my top radiator hose gets hot but not my bottom one does this mean my thermostat is bad


I don't know how did you test your radiator but if you apply below steps you can clarify your problem easier.

If you want to test your radiator:
A) Park your car (it takes more longer to get real temperature values, if the car is moving)
B) Start the engine (don't forget to engage handbrake)
C) Wait around 10 to 15 minute
D) If your top radiator hose gets hot and bottom radiator hose gets warm; your radiator is functional. (In few minutes your radiator fan suppose to work)

If bottom radiator hose is still cold, it means there is a problem at thermostat. If you see any leakage at thermostat housing at the end of above step C, you need to renew thermostat housing gasket too. Even if you buy new thermostat, i suggest you to test it before assembly. If new thermostat doesn't open enough, your car may run so hot.

If you would like to test your thermostat:
A) Boil water in disposable bowl (thermostat may exposure chemical substances)
B) Put thermostat into boiling water.
C) If thermostat opens totaly, it is ready for assembly.

top-radiator-hose-gets-hot-but-not-3h5pkc2unruv115jj1tsixdi-5-0.jpg

Nov 20, 2014 | 2000 Jeep Grand Cherokee

1 Answer

Bottom hose cold rest ok 96 celica 20 gt


the bottom hose will be cooler than the top hose because the heat has been transferred to the air via the air flow through the radiator. However if the bottom hose is cold while the rest are hot it is a fair bet that more than 50% of the radiator is blocked and it needs attention

Mar 30, 2013 | Cars & Trucks

1 Answer

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

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

2 Answers

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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