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Water coming out over flow hose not cooling motor heating up but not on guage not holding water in cooling system

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  • woodstock84 Jul 17, 2008

    thanks heaps but i didnt want to go to a mechanic get rripped or embarrassed eternally grateful

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Possibly thermostat stuck shut. Try removing the thermostat completely to se if this cures the problem, if it does, fit a new one!
Cheers....Dave

Posted on Jul 17, 2008

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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.
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I replaced my 2004 Nissan radiator and thermostat still over heating , any ideas?


Is the thermostat installed up side down. That does happen sometimes and will cause that.
Is the radiator a new one if not could be plugged and won't let the antifreeze flow.
Is the water pump functioning right. Check your belts as well.
Is the fluid in the rad up where it should be. Low fluid will cause the water pump to not work. Just thoughts of what would cause your problem.

Feb 02, 2015 | 2004 Nissan 350Z

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My 2006 Nissan sentra will not put out heat. I replaced the thermostat and no difference. I removed the heater hoses from the block and ran the engine. Water just trickled from the hose. What am I missing?...


The first thing I would do is drain all of the fluid from the cooling system (check to see if there is an engine block drain and open that too) and replace it with water. Turn the temperature setting to full hot and run the car. Leave the radiator cap off when you do this since the fluid level will go down as the car warms up. Add more water as necessary. Now does the temperature gauge on the dash reach the middle setting? Any heat coming from inside the car? Listen to the engine do you hear any noise from the belt side? Possibly a bad water pump? Turn the car off and let it cool down for about thirty minutes. Drain the water out of the radiator (you can remove the lower radiator hose if necessary) and engine block. Notice any sludge coming out in the water? Close off all the drain cocks. Now start the car and add water to the radiator and start the process all over again. The car must be running as you add the cold water to a slightly hot engine to keep the engine block from cracking. Let the car run, watch the temperature gauge, keeping filling the radiator, check for heat inside. Any better? Wait for the temperature gauge to hit the middle point between hot and cold (normal running position). Any heat on the inside? Turn the car off and let it cool again for about thirty minutes. If there is no change then let it cool off for about an hour (engine cool to the touch) and drain the system again. Pull off the hoses that go from the engine block to the firewall (heater hoses). Turn on your garden hose and place it over one of those heater hose openings. Do not turn the water on full blast you may have a leak in the car and I don\'t want you to have a flood. How much water comes out from the other hose (be careful it could be hot)? I have even blown air through one of these hoses to get any water out of the heater core. It sounds to me like you may have some sort of blockage in your cooling system. When you pull off the heater hoses take out the thermostat again and put the garden hose in the engine block to get water flowing through the entire system (all drains and hoses are off to allow the most flow). When was the water pump changed on the car? One other thing that is critical is the possibility of a regulator valve inside the car connected to the temperature setting on the dash. Some cars today do not have any way to regulate the water going through the heater core (flows freely) but if your car has one of these valves it could be bad (frozen shut). Once everything is working correctly remember to fill the cooling system with 50% distilled water / 50% anti-freeze solution.

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1 Answer

1999 ford taurus overheats boils out of res.new thermostat...saw water pumping 2 water pump....saw water pumping out of thermostat....not sure though seems like not enough water pumping through...


It sounds like you have an air pocket in your system. By the RH strut tower take the heater hose loose from the metal line and fill the cooling system when coolant starts coming out reconnect the hose. If that doesn't work jack the car up where the over flow tank is the highest point and fill the cooling system.

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1 Answer

After the vehicle is running for an hour, the vehicle get hot and shut itself off.. After it cool down, it start up. We were told it might be in the steering column.


have you replaced yor thermostat? have you checked your radiator cooling fans to see if they are coming on while your car is heating up? when your temp. guage is halfway up your fan should come on. you can check fuses and relays in fuse box[black box under hood drivers side] check those to see if fuses are blown or if fan relays are coming on[ticking while engine heating up]radiator could need flushing out also, just narrow your search some by elimination. if you open radiator cap before you start engine,then start motor, let it warm up.look for circulation,,flow of fluid,bubbling, then thats a sign it's circulating,thermostat is good. no flow means that thermostat not opening,thats bad thermostat.replace the thermostat.if not that are fans coming on? when engine at mid range on temp. guage does fan come on? if not check fuses @ fan relay. if fan comes on ,it's good.check water pump pulley for wobbly pulley while motor not running, shake pulley back @ forth for play. any play in pulley means bad water pump. are the belts on? i went through everything i would look for myself. hope this finds your problem!!!!

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3 Answers

I own a 1990 Chevy Lumina car. I had a new radiator put in it. Then I replaced the jhoses, water pump and thermastat. After refilling the system, I ran the motor for 7-8 minutes idling, then I ran it at...


It could be the fan temp. switch but it shouldn't have been boiling in the overflow tank. I'd recommend doing a compression test to see if you have a blown head gasket. If it's a blown head gasket, the compressed air/fuel mix being force into the cooling system could well look like boiling in the over flow tank.

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1 Answer

Radiator is cold, hot tmperature guage after 15 mins. red light


head gasket for sure or the cylinder liner, whats your oil look like? milky? if so you got a severe problem, I would pressure test the cooling system and leave pressurized for a time and watch oil level as its pressurized

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4 Answers

When you bypass the heater core the path for the water to go through the core is gone. Correct?, you have connected to engine water line out to the engine water input? thus bypassing the heater core........


No, you just won't have water flow through the heater core, Coolant flows through the engine through the lower radiator hose as the water pump sucks it out of the radiator and pushes it through the engine. It then flows out the top radiator hose when the thermostat opens. It then flows into the radiator to cool off.

Is your heater core leaking?

Aug 27, 2009 | Ford Expedition Cars & Trucks

1 Answer

No heat in 91 Cadillac Sedan Deville


I would beleive more that you have build up in the heater core. Try taking loose the heater hoses from the block and use a water hose to spray into one of the hoses letting it come out the other hose then switch hoses with the water hose and keep reverseing for 2/3 times each hose. sounds like stop leak may have been used in a prior time and may be blocking water flow.

Good luck,
Lugnut61

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