Question about 1991 Peugeot 405

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Cooling system I have peugeot 405 1991 1600cc automatic and for some reason it is overheating, although there is water in the system, it is also getting to the point where the excess water comes out. it doesnt cool the motor. i think there is air in the system, how can i drain the air? Thanks Tony

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  • Peugeot Master
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Right you could have an air lock in the cooling system,on the highest point at the back of the engine on one of the heater hose if memory serves me right is a bleed screw incorperated into the hose ,if it has one then start engine and add water with it undone and it should blow the air out .if after doing this and it still dont work then check the thermostat which should be on top of the engine in a housing on the cylinder head .now also it could be at the back of the engine near the bottom in a housing just above the drive shaft .which to remove means removing the drive shaft to get at it (diesel) memory is not what it was and i get confused with a citreon which uses the same engine.if it works remember to use antifreeze ,drain a drop out and add pure ethylene glycol about 2ltrs ,if it doesnt work dont waste money adding antifreeze just pull head off and renew gasket but check head for straightness with a flat edge and check liner protusion ,sorry if iam a bit vague here but old age takes its toll and iam sure these older engines use a wet liner which can cause symptons similar to head gasket problems.if it is liner playing up then scrap car as this sort of repair is a specialist repair with special tool and thats if parts are still available,ie the lower seals for the liners and its costly.

Posted on Nov 20, 2008

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Why did my 2011 DTS Cadillac overheat?


An overheated engine can be caused by anything that decreases the cooling system's ability to absorb, transport and dissipate heat; therefore engines can overheat for a variety of reasons. Let's take a look at some of the most common causes.
Cooling System Leaks
This is the primary cause of engine overheating. Possible leak points include hoses, the radiator, water pump, thermostat housing, heater core, head gasket, freeze plugs, automatic transmission oil cooler, cylinder heads and block. Perform a pressure test. A leak-free system should hold pressure for at least one minute.
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Be sure to use the coolant recommended by your vehicle's manufacturer. The wrong type of coolant and/or mixing the incorrect concentration of coolant and distilled water can also result in engine overheating. The best bet is to perform a complete flush and fill.
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A thermostat is a heat-sensitive valve that opens and closes in response to engine temperature. Heated engine coolant passes through to the radiator when the thermostat is in the open position. In the closed position, it prevents the flow of coolant to speed up the warming of a cold engine. When the thermostat gets stuck in the closed position, coolant stays in the engine and quickly becomes overheated, resulting in engine overheating.
Blocked Coolant Passageways
Rust, dirt and sediment can all block or greatly impede the flow of coolant through the cooling system. This can limit the system's ability to control engine temperature, which may result in higher operating temperatures and engine overheating. Once again, a flush and fill is recommended to remove debris.
Faulty Radiator
By passing through a series of tubes and fins, coolant temperature is reduced in the radiator. Leaks and clogging are some of the most common causes of radiator failure. Any disruption in the radiator's function can lead to elevated engine temperature and overheating.
Worn/Burst Hoses
A hose that contains visual cracks or holes, or has burst will result in leaks and disrupt the flow of engine coolant. This can result in overheating.
Bad Radiator Fan
A fan blows air across the radiator fins to assist in reducing the temperature of the coolant. A fan that wobbles, spins freely when the engine is off, or has broken shrouds will not be able to reduce the temperature to proper level, thus possibly resulting in engine overheating.
Loose or Broken Belt
A belt is often the driving link that turns the water pump at the correct speed for proper coolant flow through the cooling system. If a belt is loose or broken, it cannot maintain the proper speed, thus resulting in poor coolant flow and ultimately, engine overheating.
Faulty Water Pump
Known as the 'heart' of the cooling system, the water pump is responsible for pressurizing and propelling engine coolant through the cooling system. Any malfunction of the water pump, including eroded impeller vanes, seepage or wobble in the pump shaft, can prevent adequate coolant flow and result in engine overheating.

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You need to remove the radiator cap and top up the cooling system with anti-freeze and water mixed to specifications. Note that I mention RADIATOR CAP and not the expansion reservoir cap. Remove the radiator cap with the engine COLD. Once you have filled the radiator, you need to run the engine until it gets to full operating temperature. Some of the water will overflow out until the thermostat opens, then the water level will rise and fall. When it has settled, bubbles have stopped, turn the engine off, top up one last time. Replace the radiator cap and then top up the reservoir tank.

There are videos online, Google 'burping cooling system', and look at the images tab. Here you go.

http://www.bing.com/videos/search?q=%27burping+cooling+system%27&FORM=HDRSC3
burping cooling system Bing video

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There are a number of possibilities:
1. Not enough anti-freeze in the cooling system. Anti-freeze not only protects against freezing, but also boil-over.
2. Defective thermostat. If it is stuck closed or partially so, it can cause overheating.
3. Clogged radiator.
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5. Blown head gasket.

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1 Answer

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hope2help shack

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HI,FIRST THING TO CHECK IS YOUR COOLING FAN COMING ON WHEN HOT? IF YES TRY REMOVEING T/STAT AND SEE IF IT OVERHEATS,TRY THIS BEFORE ANYTHING ,THANKS

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Automatic - overheating blowing coolant out of rad cap and expansion tank. Fan working OK. No oil in water, although quite rusty coloured. Oil level OK and no increase or decrease on dipstick. All clear...


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