Question about 2005 Peugeot 405

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Engine overheating I have a Peugeot 106 XL 1.4 5 door Auto, 1998. The water temp warning light kept coming on. I have a new radiator, checked the thermostat (by boiling it). I have left the thermostat out and the engine now runs (at tickover) without the light coming on, just the fans cutting in on demand. I am not in a position to drive it far. However, I have no heat in the heater and I am begining to doubt the water pump. I have tried to bleed the air out of the system at the bleed valve on the thermostate cover. As far as I can tell the water is flowing round the engine but how can I be sure?

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  • tony3200 Dec 27, 2008

    core plug has blown , full service history with a full service done 3 months ago , milage is low can you give me any reason as to whats happened , light brown thick solution came out of one place rather than leaking from every area of cylider ?



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Take one of you heater hoses off then start engine

Posted on Nov 19, 2008


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I have a T reg Peugeot 106, the temperature light keeps coming on even thou I've topped the oil up. Any info plz

Topping up the oil has very little bearing on engines overheating.

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.
burping cooling system Bing video

Jun 02, 2016 | Peugeot Cars & Trucks

1 Answer

Coolant boiling problem

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.
4. Defective water pump.
5. Blown head gasket.

Dec 30, 2015 | 2006 Peugeot 206 1.4

2 Answers

Overheating when stopped. New thermostat, new head gaskets. Antifreeze will be boiling and spill out the reservoir no matter what antifreeze level is.

Check your fan, if it is electric fan, make sure it comes on. Check if your radiator is blocked or clogged, Remove it and get it inspected & cleaned by a radiator repair shop

Aug 13, 2015 | 1998 Dodge Avenger

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Whats causing car to keep running hot?

Change your thermostat then it will run at the right temp. Unless you have a cracked head or a blown head gasket

Feb 22, 2015 | 2005 Lincoln LS V8

1 Answer

Why Won't the cooling fan come on?

You may have hit on the answer, remove the thermostat check it's clean ttip a kettle of boiling water over it (use a bowel of bucket) see if it opens easy may just be very mucky needs cleaning or replace if it don't open quickly when you tip boiling water over it. Only other thing would be to clean the water system out "Rad Clean will do the trick" or try drain from radiator with hose pipe connected to water tap see how much rust comes out that is another easy way. Best Wishes, Malcolm Campbell.

Jul 03, 2017 | Chevrolet Cavalier Cars & Trucks

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Engine temp problem

My experience with the chevy coolant system, cambelt/timing belt will probably not affect the temp. Never-mind what pseudo half wit wanna be mechanics tell you, trust me, they just want your money for work that doesn't need to be done. Start with getting a repair manual for your car, Clymer, et cetera, can be purchased in any Pep Boys, Advance Auto. First check for leaks, especially around timing belt area, which will mean faulty water pump, then and only then do you replace timing belt and water pump. If no noticeable leaking, check level. If that's fine, make sure anti freeze is appropriate mixture strength, lastly replace thermostat. Auto repair manual will tell you exactly what tools are required and level of difficulty in replacing thermostat. Fairly easy, but I have been doing it since birth. One more thing, if your car is within operational temperature standards, don't sweat it, it's an old car and they get weird with age!!!! Hope this helps! If problem persists after this, contact me personally!! Thank you!

May 19, 2013 | 1998 Chevrolet Malibu

1 Answer

Peugeot 406 coolant temp warning light

1. Check the coolant level if you have not already.

2. The most likely cause is a stuck thermostat so that when the engine is getting up to operating temp the thermostat is not opening at all - or enough - for the coolant to flow freely between the radiator and the engine to cool the heated fluid. If you check the radiator after driving and find it is cold it is a sure sign that the heated coolant that is circulating through the engine at operating temp and higher is not getting to the radiator. The first thing I would do is to change the thermostat and re-check. At the same time completely flush the coolant and replace it with new fluid of the correct spec.

The radiator fans are not going to operate when the fluid in the radiator is cold because the hot fluid cannot flow through from the engine. The fans have a temperature sensor switch.

3. If that does not solve the problem I would suspect the water pump has corroded and needs to be replaced. However from the symptoms you have described I believe a new thermo will fix the problem.

4. Don't drive the car when it is overheating. This is a certain way to blow the head gasket and potentially crack or warp the cylinder head. (In a worst case you can crack the engine block.) It will be nice and expensive to repair if you blow a head gasket or damage the cylinder head.

Dec 22, 2012 | Peugeot 406 Cars & Trucks

1 Answer


Sufficient coolant? Check the coolant reservoir first. Then, WITH THE ENGINE COOL, undo the radiator cap and check the coolant level in the radiator itself. Fill completely full as needed.

Any noises from the water pump? It may be failing, although a small leak is usually present and you say there's no leaks.

Remove the thermostat and check it by putting it in a pan of boiling water. Does it open like it should? If not, it needs to be replaced.

You CAN run an engine without a thermostat but it will warm up very slowly but that would be a good test to see of that stops the overheating.

Do you have a temp gauge in the dash? Or just a warning light? Do either indicate overheating. If they do, turn on the HEATER [not defroster] and see if the temp goes down or the light goes off. Your radiator may be partially clogged and the heater core will act as kind of a secondary radiator.

Feb 21, 2012 | 1995 Cadillac DeVille

1 Answer

Peugeot 106 1.0 litre, temperature warning light on dash comes on one or two minutes after starting engine, sometimes stays on or intermittently goes off and on whilst driving. Also the radiator cooling...

hi, if the collant level is ok and the car isnt over heating then check the heater works in the car and make sure it gives of heat when hot is selected if it dont then the chances are the thermostat has gone and needs replacing.

If on the other hand you have heat then the chances are its just a faulty temp sensot these are cheap to buy and easy to replace.

Let me know how you get on or if you need further assistance ok

Dec 28, 2009 | 1991 Peugeot 405

2 Answers

2004 gmc envoy code 0128

This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

Jul 17, 2009 | 2002 GMC Envoy XL

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