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Cooling fans not running system losing water - 1991 Honda Accord

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Cooling fan sensor bad

Posted on Jan 11, 2009

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on the radiator there is the fan temp switch. it sits on the right side of the front of the radiator as you look down. there is also a temp sensor for the ecu a smaller type. fan switch connector is clipped in wiring. usually a large spanner will remove it but you will need to bleed the watering system when you replace it as you will lose alot of water. so after refitting with new one. top up the system and leave the top off the filler tank and run engine till the fan comes on and keep it topped up rev engine a bit some times as this will help to get the air out. squeeze the water pipes and keep topped up. when fan comes on turn of engine and leave to cool down. wile engine has been turn'd off it should not lose water if it still keep bubbling out of the top. then there is air still in the system. repeat when cooler.

Dec 07, 2013 | Opel Corsa Cars & Trucks

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I have already replaced the radiator and thermostat but my 91 Honda Accord still overheats, why?


Run a cooling system pressure test. If you are losing pressure, then you will have to first locate the source of your leak.

With the engine started and the radiator topped off with coolant, does the radiator spout water out of the top? Does the spouting become more aggressive with engine revs? Yes? = Blown head gasket, or cracked cylinder.
No?- check operation of radiator cooling fan. With car stationary and hood up, run engine up to temperature and make sure radiator cooling fan kicks in before the engine temperature rises too high.

Nov 03, 2012 | 1991 Honda Accord

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Engine running hot , not thermostat , not fans


Some of the cars have 2 speeds for the fan. The high speed on the fan or the high speed relay could be bad. Then you could have a clogged radiator or cooling system needing a backflush. Some Quickchange oil companies will flush a cooling system while you sit in the car.

Its not impossible for the thermostat to act up if the system is dirty.

Aug 11, 2012 | 1991 Cadillac DeVille

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The car is running hot..we went to change the thermostat, but discovered it didn't have one in the line. What could be causing it to run hot??


check electric fans to see if they are coming on. and also make sure there is enough anti freeze in system. if fans do not work proper, check the fan relay if relay is ok. then the problem is either a bad wire or the fans itself are bad. to check fans-- take wire connector off of fans, then run a wire from positive on battery to positive on fan, ground other wire if need be. if fans do not run then thats your problem.

Aug 20, 2010 | 1996 Nissan Sentra

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Runs cool for about 15 miles then it gets hot(220) so i turn it off to let it cool about a half gallon of water is gone


220 to 230 deg. F is actually normal for the 1998 Cadillac Deville. If it goes to 250 deg. F or even 260 deg. F it goes into a limp mode where fresh air is pumped into 1/2 of the cylinders to preserve the engine up to 40 mi. of travel (in the case that a radiator fan isn't working or coolant has completely leaked out of the system).

If a half gallon of water is gone in the system and you keep losing it, there is a leak in the system say in the water pump o-ring or the radiator, or a hose.

Jun 28, 2010 | 1998 Cadillac DeVille

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I have a 1999 Porsche 911 it overheats on side street but not on the freeway. All radiator fan works including engine fan. Any suggestion?


air pockets develop over time and what most people do not realise is that the cooling system of the car loses water through damp over time. when there is not enough water in the cooling system it pushes air through which rapidly heats up. on the highway higher speeds cool things down. but lower speeds not. open the waterbottle cap when the car is totally cooled off. not hot. never when its hot. this will create more air pockets in the cooling system. open the bottle cap and fill it up full. start the engine and add water. if you car has an aircon switch it on to full. this will push air pocket out off your cooling system. as bubbles blow out keep on filling water until cooling system is bled. good luck

May 07, 2010 | Porsche 911 Cars & Trucks

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Losing water from radiator cap have tried replaceing but problem still there is there diferent caps or is the fault with radiator local garage says no


You should not be losing water from your radiator cap. When the water in your system reaches such a pressure that it needs relief, it will normally flow into the overflow tank (the opposite occurs when the system is cold; water flows from the overflow tank into the radiator).
So, the first thing I would do is to get the proper cap for your radiator.
Second, I would check to make sure my cooling fan was running (I'm assuming that you lose water when the engine is hot).
Third, I would make sure to bleed the system if I had to add a significant amount of water (bleeder should be on top of the fitting that your top hose goes to; loosen and observe until water flows cleanly without bubbles, then close).
I have to think that your cap, new or not, is the problem.
Hope this helps you.

Nov 15, 2009 | 1998 Honda Accord

2 Answers

Cars losing coolant pressure not losing coolant running very hot!


you need to verify and fill the coolant in the radiator and reserve when the engine is cold,also check to make sure your cooling fans are kicking on when it is hot

Oct 30, 2009 | 1996 Ford Thunderbird LX

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Engine overheats and cooling fan cuts off


try to replace the hoses, they may be collapsing, then replace the thermostat, and give it a radiator flush to clear any possible clogs in the lines, last thing i would say is to replace the fan

Jun 24, 2009 | 1995 Ford Escort

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