Question about 1998 Dodge Ram 2500 2WD

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2000Dodge ram Should the lower radiator hose be warm when the heat is on

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Both upper and lower should be warm when engine is warmed up and thermostat is working properly

Posted on Dec 27, 2008

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Posted on Jan 02, 2017

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With engine at normal operating temperature why is the top radiator hose hot and the bottom hose warm?


It is normal for the top radiator hose to be hotter than the lower hose. The top hose brings the heated coolant from the engine to the radiator, and the lower hose returns the cooler water from the radiator back to the engine to help keep the engine at proper temperature. For the smell, check to see if you have any oil leaks, especially where the oil may run/drip on to the exhaust manifold. Check the valve cover gaskets, and look for excessively oily areas on the bottom of the car to see if you can find where the oil is leaking from.

Oct 01, 2016 | 2006 Cadillac SRX

1 Answer

I have a 2000 Bmw 323 I that is having a overheating problem what would be the cause of the overheating problem a thermastat a water pump or a radiator flush


Could be any or all three or a bad cooling fan. I'd start by replacing the thermostat since they are dirt cheap. After replacing the thermostat warm the vehicle up and feel the upper radiator hose if its hot the rhe thermostat opened and the water pump is circulating coolant next check the radiator it should be hot near the upper radiator hose and significantly cooler near the lower with an even heat distribution if any parts of the radiator dont get warm/hot then you radiator is plugged. Also you need to check the operation of the cooling fan with the engine warm turn on your ac that should immediately turn the electric fan on

Jun 12, 2015 | BMW Cars & Trucks

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I have a 2004 Dodge ram 1500 5.7. Luke warm heat


are you talking about your heater core for heat in the truck ? is there a valve in the heater hose that you have to open to get the hoses hot to the core this is under the hood , follow the hoses , could be clogged core , does it over heat , or get up to temp should be about 190 normal temp for most motors why did you change these parts anyhow , did you use the radiator fix bars leak stuff that you put in , bars leak , if so you may have clogged your core , take the hoses off the core and blow it out ,pain in the but you went this far , ck for that valve to open

Mar 07, 2015 | 2004 Dodge Ram 1500

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Heaters running cold at 90 degrees


If the engine is running at a normal temperature I would suspect the thermostat.
Normally from a cold start the coolant should only circulate through the bypass hose, the heater matrix, and back through the engine, As the engine warms up and the thermostat begins to open the coolant is directed through the main radiator - at this point you will be able to feel the upper and lower radiator hoses warming up.
If the thermostat is faulty and permanently open you will be able to feel the upper and lower radiator hoses warming up very soon after starting the engine and at the same time as you feel the heater hoses begin to warm. This causes most of the heat to be radiated away and so the heater will never warm up.
Unfortunately the thermostat is hidden underneath the water pump on a passat and requires the cooling system to be drained before it can be changed. It may also require the power steering pump to be removed to get access to the thermostat cover.

Feb 01, 2014 | 2001 Volkswagen Passat

1 Answer

2002 dodge ram no heat


Do you live in an extremely cold region? If so, those folks usually have a problem with heater in winter time. With a fully warmed up engine, how hot does it get in degrees F? Are the heater hoses hot?

Mar 12, 2017 | 2002 Dodge Ram Pickup 1500

1 Answer

Over heating


AGE & MILEAGE...SERVICE HISTORY? COULD BE A THERMOSTAT (FEEL TOP RAD HOSE COMPARED TO LOWER HOSE FOR EQUAL TEMPS...IF LOWER IS COOLER (AFTER 15 MINS OF WARM UP)...THERMOSTAT IS STUCK!
ALSO COULD BE PLUGGED RADIATOR, HEATER CORE...ETC.....

Mar 10, 2013 | 2000 Saturn SL

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

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2005 Chevy Impala...all I did was change the lower radiator hose because it was leaking. Now the car overheats, the upper hose is hot and the lower hose is warm. Does this model have vapor lock issues or...


the lower radiator hose is a return hose and there are no vapor lock issues. If your coolant level is full when you start your vehicle and when it heats up and the system pressurizes your coolant expands with heat and then that excess pressure will go through the overflow outlet to the reservoir and the reservoir has a relief opening near the top to relieve pressure or for excess fluid to come out. If the lower hose is just warm then your water pump may not be circulating properly (be sure to check belt for tension no more than 1/2 inch of play should be present). One messy way to test water pump would be to first drain coolant if it is good to reuse it, then remove the lower hose, open the radiator cap and put a water hose in it and turn on half way. Look at the volume of water coming out and have someone start the vehicle and idle at about 2000 rpm if that volume has not doubled your pump is bad

Apr 28, 2011 | 2005 Chevrolet Impala

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