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Over heating when idling and coolant explodes out of the overflow tank

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MAKE SURE COOLANT LEVEL CORRECT. REPLACE THERMOSTAT AND PRESSURE CAP.MAKE SURE COOLING FAN WORKING IT HAS TO BE CHECKED BY USING A DRB 3 SCAN TOOL.

Posted on May 12, 2010

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Posted on Jan 02, 2017

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2004 Polaris edge 600The coolant tank exploded and antifreeze was all over the place. What would cause this? Did even get to ride it yet was warming it up. So it was sitting idle for bout 10.


What was the outside temperature? The heat exchangers are under the running boards/tunnel and require to be covered in snow for efficient cooling. IS this model equipped with an electric fan? If so, is it operational. The thermostat may also be in need of replacement

Feb 14, 2016 | Cars & Trucks

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How to fix the heat to work all the time when not moving


This can happen if your water pump is failing. You will get the most heat when your water pump is forcing the fluids to circulate within the engine block.

Jan 09, 2016 | 2008 Nissan Pathfinder

1 Answer

The overflow need to be filled with water?


Yes, it is important to include the overflow tank or bottle as integral with the radiator and coolant system as a whole. They all intermix. Actually, the level in the overflow tank is a true measure of the correct amount to keep your coolant at. There are two marks on the overflow: full hot and full cold. The coolant system on all modern cars is a sealed system and therefore should never require adding, save a very small amount through evaporation within the overflow tank- the only part that is open to atmosphere.

So once you get all the air out of the system that is possible, both in the engine and in the radiator, you have a full level everywhere, including the overflow tank where it should always remain somewhere between the full hot and full cold marks.

You are right that the overflow collects the heated radiator coolant. But it is due to the expansive properties of coolant-or water- that it expands when heated, (but not boiling-that is very bad news of a different sort). Your radiator cap is designed to open at a specific pressure, just enough to allow coolant to flow into the overflow. As the engine and coolant cools, it contracts, the level drops in the radiator, and a natural vacuum there will siphon the overflow tank back into the radiator until it is full again. That is why you have the full hot and full cold marks.
I will shut off the lecture now. I hope you have liked my answer. If not, I give you permission to kill me now- if I may so jest.

Mar 06, 2015 | 1992 Toyota Corolla

1 Answer

My 03 FES is overheating & my check gage light is coming on. i have no leaks under my truck. what is causing it to over heat?


Have you already confirmed that the coolant overflow tank has at least the minimum coolant in it?
Does the water level in the coolant overflow get higher when the engine is heated up than when it was first started?
At what speed does this happen? Idling only, or also when driving 35+ miles an hour.
A quick test - when the engine is warmed up, touch the radiator. If it is still cool, the problem is likely the thermostat - it probably isn't opening when the engine gets hot.

Oct 08, 2013 | 2003 Ford Explorer Sport Trac

2 Answers

Can a water pump make water to return to the water bottle


If the engine overheats from a thermostat
stuck closed or bad head gasket

Aug 10, 2013 | Cars & Trucks

1 Answer

Does a blown head gasket cause pressure build up in a surge tank


could be a air pockets in the coolant system that have top bled out
it is a simple exercise to have a compression test done to check for head gasket or cracked head

Mar 14, 2017 | 1999 Cadillac DeVille

1 Answer

2001 Town and Country. Coolant backing up into overflow bottle, which is causing the overall level to drop. As a result, I have no heat in the passenger compartment. Get heat when system refilled. At a...


If everything is working correctly; thermostat, heater core, water pump, head gaskets, etc. Then that leaves the radiator cap, the overflow hose or the overflow tank as being the problem.

As the engine heats up the coolant expands flowing into the overflow tank. As the engine cools the coolant is drawn back into the engine from the overflow tank. but this depends on the vacuum created by the cooling liquid. the radiator cap has a "valve" that lets pressure out and vacuum in. If it fails then you may not achieve a good vacuum. The hose that connects to the over flow tank must be non leaking as well; if it leaked then coolant would not be drawn back into the engine, only air would be sucked in. And lastly the coolant has to be drawn from the bottom of the overflow tank. again we dont want to be sucking air.

Some engines require a vent screw to be opened when bleeding the air out of the engine.

Jan 14, 2011 | 2001 Chrysler Town & Country

1 Answer

No heat at idle


radiator coolant level and overflow tank low fill overflow tank to max remove radiator cap top off coolant level, start car and let it warm up for 5 or 10 minutes, if fluid level drops top off radiator with coolant again check for heat output if OK replace cap DONE else have someone increase engine RPMs (around 3500rpm) top off coolant level (there was air in system) replace radiator cap

Dec 06, 2010 | 2005 Nissan Altima

1 Answer

97 cadillac eldorado overflowing through overflow pipe


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank(not the cap),this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Apr 11, 2010 | 1987 Cadillac Eldorado

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