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Hot water on inlet side of radiator very slow running. outlet side stays cold

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If this is happening with only 1 radiator then you have sludge build up inside radiator. Allow system to cool and shut inlet/outlet valves. Drain water from RADIATOR side of valve. Remove radiator and power flush to remove sludge. If this is happening on several radiators then the pump could be failing. If this is a new system then most likely system needs balanced.

Posted on Jun 22, 2010


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2 Answers

Can you hook both heater hoses to the intake i put a 85 chevy 350 in it no were to hook on water pump

One exits the thermostat housing and the other needs to enter at a different point, usually the water pump.

Nov 04, 2015 | Cars & Trucks

1 Answer

I have a new Bradford white 40 gallon gas hot water heater. There are no single handle faucets. The hot water fluctuates between hot and cold. When I close both inlet and outlet shut off for the hot water...

Sounds like water leak.
For example, broken pipe... or water running out of TP valve.
That would explain variable hot-and-cold water at tap.
Turn off all taps, and observe if water meter is registering water usage.

Jun 15, 2014 | Water Heaters

1 Answer

Were is cold water inlet and hot water outel on model 71-40d b

Cold inlet and hot outlet are marked on top of water heater.
Usually there is a letter or word embossed into the metal top.

If tank is connected, then turn on hot water tap for a few moment and feel which pipe is hot.

Cold water enters bottom of tank through dip tube located on cold side. If hot and cold are reversed, the water heater will not perform as expected.

Aug 05, 2012 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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Replaced thermostat and housing, still running hot. is there a cooling sysrem bleed valve? 2002 ford explorer 4.0

check to make sure the coolant is running freely into and out of the radiator. you can do this by squeezing the inlet and outlet hoses when the engine is cold, so you dont burn your hand.
also while the engine is cold, open the reserve/overflow cap outside the radiator, usually next to the side wall. with the cap off, one by one squeeze each cooling system hose, and see if it backs or forces coolant into or out of the overflow reservoir. if coolant comes out of the top inlet hole when squeezing a hose, the thermostat is probably stuck closed, if the coolant in the reservoir bubbles from below, you probably have a clog in the engine ports where the coolant passes by the head to cool it off. if you have ever put only water in the radiator instead of the proper mixture of coolant to water. there could be some mineral or calcium deposits clogging things.

Jan 18, 2011 | 2002 Ford Explorer

1 Answer

Hot water tank does not work when shower is on, it does however work when the faucet in bathroom is on. It quit working in the shower about a month ago.

    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
    If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate. The minimum water pressure for the home should be 30psi or greater. For people on well systems the minimum pressure range is 30-50psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant water pressure to the water heater. Watts brand 25AUB- ¾" or N35B-¾" pressure reducing/regulating valves or equivalent is suggested.
    Major changes in flow rate can adversely affect the output water temperature of the heater. Increases from one major fixture running to multiple fixtures running at one time can cause the temperature to fluctuate. Stay within the heater's specifications. See: TWH E2-03 Outlet temperature vs. flow rate [PDF].
From the Bosch website.

Good Luck,

Dec 16, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Truck is running hot. Relaced thermasta and still runs the same. Noticed the top hose gets real hot while the bottom one doesnt. Dont get it.

The cooling water doesn't seem to making it through the radiator. Look for plugged radiator, blocked upper or lower hose, or ineffective water pump. Remove the inlet and outlet hose after draining coolant from the radiator. Hold your hand over the lower hose outlet while someone fills the radiator with cold water. When full, leave the cap off, then remove your hand from the outlet. If the core is unobstructed, the water will rush through it in a few seconds. Check the upper hose inlet--there should be no obstruction. Inspect the interior of each hose looking for collapse or other blockage. If ok, that leaves the water pump--remove it from the engine and check that the impeller turns solidly with the driving pulley. Any looseness there is grounds for replacement. Hope some of this helps!

Jun 29, 2010 | 2004 Dodge Ram 1500

1 Answer

My radiator keeps running hot and it doesn't appear that either fan is running with the engine on. I've had the radiator flushed and refilled and have no evidence of glycol leaking under the car while...

When radiator is hot feel the inlet and outlet hoses. If the radiator outlet hose(top hose) is hot and the radiator inlet hose(lower) is cold, its your thermostat. If its not that and both hoses are hot, you may need to check your water pump. Hope this helps.

Aug 17, 2009 | 1997 Honda Accord

1 Answer

Hot water runs very slow

The dual inlet valve (water valve) has solenoids that get told when to open and for how long. If the solenoid is bad - it may not open all the way.... OR the inlet screen is clogged with sediment.

The Last one is easiest - remove the hose for hot (might as well do cold while you have it away from the wall)
On the machine side inlet for the hoses - there is a sediment strainer.
These can be removed and reverse-rinsed to clear the sediment.


If the screens are clear - your water valve needs replacement.


Thanks for using FixYa - a Very Helpful rating is appreciated for answering your FREE question.

Aug 04, 2009 | Maytag Atlantis MAV6000 Top Load Washer

2 Answers

How do i flush a radiator

go to auto parts store and get a flush kit,

cut and insert the "T" from the flush kit on the heater hose outlet or inlet.
make sure you are cutting into the heater hose coming out of the firewall heater area and not a large vacuum line.
if your not sure ask a mechanic.

connect the kits anti syphon to water hose and connect to the T you have installed ,
open the radiator , and flush very slow if engine is hot , or wait till engine is cool as a very cold flush can damage the engine.

Jun 18, 2008 | 1995 Chevrolet Lumina

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