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Anonymous Posted on Feb 28, 2013

Bottom radiator hose cold

New water pump and thermostat but bottom radiator hose is still cold

5 Related Answers

Anonymous

  • 10 Answers
  • Posted on Jan 20, 2009

SOURCE: does not heat in idle

is the heater fan working

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Anonymous

  • 17 Answers
  • Posted on Jun 04, 2009

SOURCE: Water not staying in Radiator

yes, not having an overflow reservoir for your radiator will cause you to lose water. As your engine warms up the water expands and creates pressure in the cooling system. When the pressure reaches a certain point(usually about 15 psi.) the radiator releives the pressure by releasing water into the overflow tank. When the engine cools back down the water shrinks pulling water back into the radiator from the overflow. If there is no overflow, the everytime the engine warms up on a drive water will be lost and not recovered on cooldown.

Anonymous

  • 583 Answers
  • Posted on Jul 27, 2009

SOURCE: Water boiling out the bottle as the car overheat's

it is without doubt blown head gaskit,or cracked block---a quicktest at radiator centre will confirm this only takes a couple of minutes

Anonymous

  • 290 Answers
  • Posted on Aug 29, 2009

SOURCE: coolant leak in the back of water pump.

replace water pump; sounds like it's coming from the weep hole(that's what it's called), because it starts like tears, and then comes the floodgates. your're gonna need a w pump.

Testimonial: "Thanks for the valuable info about my water pumps weep hole. You hit it right on the nose."

steven spiegel

  • 235 Answers
  • Posted on Sep 13, 2010

SOURCE: I have a 2006 hyundai

when engine is running there is more pressure on hose you have to have a pin hole in hose. you better replace right away because if you don't and the car over heats you will possibly blow your head gaskets causing water to get into your oil and costing you a small fortune. replace hose right away and make sure you have plenty of engine coolant in your vehicle.

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Related Questions:

0helpful
1answer

Looking at a 97 Volkswagen cabrio that's been overheating. Start it and within minutes it's overheating with a flashing coolant light. Under the hood the top radiator hose runs to the thermostat housing...

It would have been useful to know where the hose from the tee goes and what diameter as that is new to me. 50 years as a repairer and I have never seen a top radiator hose with a tee branch.

Usually the engine heats and the thermostat opens and starts coolant circulating through the radiator, up the bottom hose into the water pump to be pushed round again.
The volume of coolant moved by the water pump, even at idle should be far in excess of that circulating through the heater matrix ensuring adequate circulation through the radiator as soon as the thermostat opens.

The top hose must be hot because the thermostat is open so why doesn't the coolant go further and heat either the branch or the rest of the hose and radiator...
Sometimes a pump with a plastic impeller will lose a vane and overheating due to insufficient circulation is likely.

Other things are more common - semi-blocked radiator tubes restricting coolant flow.
Silt build up in the cylinder block causing hot spots in the cylinder walls.
Restricted air flow through the radiator.
Electric coolant fan not working.
Excess combustion gas in the cooling system interfering with thermostat operation.
Degassing system blocked with the same result.
0helpful
1answer

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
1helpful
2answers

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.
0helpful
1answer

Why is lower radiator hose cold when motor is at operating temperature?

Ensure thermostat is installed right side up or it wont allow proper flow. If thermostat is correct other problems could be Air in cooling system, low coolant level, plugged rad internal, water pump failure,coolant flow valve stuck,internal engine combustion leak to cooling system.
Auto Repair Diagnostics How to Diagnose Cooling System Problem
0helpful
1answer

Water pump stops pumping at ho water pump stops pumping at high RPMs

check for blocked radiator cores
check that if the thermostat is at the bottom hose in the block that it is operational ( opening)
check that the bottom radiator hose is not collapsing at high rpms water pumps very seldom stop pumping unless they cannot get water to the vanes from thermostat is not opening ( too cold or faulty)
radiator is blocked
air lock in system
bottom hose is too soft and collapsing under suction
1helpful
2answers

Lower radiator hose stays cold after running for hours

could be you fitted the thermostat in the wrong way around ,or the plastic impeller on the water pump with a steel drive shaft has failed they end up with the drive shaft spinning but the impeller is not turning ,go for the thermostat first though .
0helpful
1answer

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.
1helpful
2answers

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
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