Question about Peugeot 405
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Posted on Jan 02, 2017
SOURCE: engine cooling fan
Try the cooling fan switch, it looks like a large brass nut with wires on it on the thermostat housing or radiator.
To test, pull off the wires and connect together, turn on ignition and the fans should cut in.
If they don't it could be the relay, fuse or broken wire.
The switch is easy to replace, unscrew and rescrew in the new one. Connect the wires, not important which way the wires go, and refill coolant.
Posted on Aug 25, 2009
most fans are clutch fans and they work or are engaged by temp.most all will spin under really cold conditions.this is normal.but to be sure, with the motor off and key in your pocket grab the fan and see if it wiggles or has any slop. if not alls good
Posted on Dec 20, 2009
Testimonial: "Although his response was very brief, it was helpful."
SOURCE: 1991 honda accord lx cooling fan
Some vehicles have sensors that can control the electric fan with the ignition off to keep the heat buildup that naturally occurs right after turning off the engine. This can prevent hard starting that can happen with a hot engine. If it is doing this an abnormal amount, the sensor that is operable with the ignition off may be failing. Before turning off the ignition, check to see if the engine temperature is pushing the 'red zone;' if it is, then the fan operation may be normal but your engine may be running hot.
Posted on Feb 05, 2010
There could be 3 possible problems here.
If the dashboard is saying the engine is overheating at 90 degrees and there is still cold air coming through then the thermostat could be faulty. I would suggest that you remove the thermostat and place it in a beaker of boiling water. If the top begins to open as the temperature rises, then it is fine. If not, then the thermostat will need to be replaced.
If the thermostat is fine, I would then suggest that you check your coolant levels, the coolant pressure or make sure there isn't a crack in the radiator. If there isn't enough coolant in the system then it won't perform to its highest standards. If the coolant pressure is too low, then it won't be able to cool high temperatures, although 90 degrees isn't very high for the engine to overheat. If your radiator has a crack in it then it will be leaking coolant which would explain a low coolant level and loss of pressure.
A third problem could be air getting into the heating system which will cause air to get trapped in the radiator. This would stop the normal flow of coolant. So now I would suggest checking the cylinder head gasket and do a pressure test to see if there is any air getting into the system.
Posted on Feb 02, 2011
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