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Next: 2001 Expedition Front Timing Chain Noise
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Joined: Jul 20, 2005
Posts: 19
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(Msg. 1) Posted: Sat Jul 30, 2005 1:22 pm
Post subject: 406 HDi Exec Cooling Fan
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Help!
Temperature of my car is just below the 90' when running happily, but if I let the engine idle for 10 minutes or more (taxi driver so this happens quite a lot) I get the dreaded dashboard stop light flashing at me along with an audiable beep temp reading just above 90'. amd no cooling fan running!!! NB STOP lighs is flashing but no other lights are on
I have found a temperature sensor (green plug) on the left hand lower side of the thermostat housing i.e. directly above the gearbox bell housing
when i removed the plug the Cooling fan kicks in quite fast so at least I know the fan works, at the same time the temperature needle on the dash reaches 100-105 with the plug removed, and the display in the centre console beeps and reads "engine temperature too high". as soon as I replace the plug the Fan Stops the temp drops back to 90' on the dash, but the STOP warning still flashing and beeping. If I go for a drive the temp drops back to about 88' and light stops flashing
the connection to the sensor (green) looks good/clean
Any Ideas? Is there more than 1 temp sensor?, dont want to cook my engine |
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Joined: Dec 13, 2004
Posts: 34
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(Msg. 2) Posted: Sun Jul 31, 2005 7:45 am
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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Hi, I suppose you have one multispeed fan with several relays to enable at different temperatures, and it seems that the only one to enable properly is the "seriously hot "one. According to wiring diagram ECU sends enable signal to lo speed fan relay, relay connects 12v to fan via a series resistor (quite a high wattage one). Obvious things to check are:-
1. enable signal from ECU to relay (maybe 12v).
2. relay clean contacts and working.
3. low speed series resistor not o/c.
Temperature sensor should be ok because the guage seems accurate.
best of luck
T. |
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Joined: Dec 13, 2004
Posts: 34
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(Msg. 3) Posted: Mon Aug 01, 2005 8:49 am
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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 Hi again, may have given you some dud info there. Just had a look at my hdi year 2002, and they use a different set up. This model did have the problem which set fire to the car, and had to have a modified fan fitted. The original fan had 12v going to "intelligent fan" which went up in flames when water got near it. This now has a relay between 12v and fan motor adjacent to battery. Dont know whether it has a lo speed motor or not. Might be an idea to check whether your unit needs a free safety hazard convertion. BTW I ran my engine for 20 mins, and couldn't get the fan to kick in, it just stays at 88c.
T >> Stay informed about: 406 HDi Exec Cooling Fan |
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Joined: Jul 20, 2005
Posts: 19
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(Msg. 4) Posted: Mon Aug 01, 2005 2:24 pm
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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Hi Tonyh and thanks for the input,
have located a black box at the side of the battery as you pointed out and it has 3 relays and 3 x 40Amp fuses all connections look clean and ok,
removed and re-seated each relay. although I hav'nt electrically tested the relays (have a multimeter but dont know how LOL)
also substituted a different temp sensor from another 2.0HDi, tested the sensor :- 4.5k ohms at room temp and 1.5k ohms in boiling water, so as you have already said the sensor is ok.
Baffled, could it be something to do with the fact that my Air Con is'nt working? (holed condencer), since i know the fan is supposed to work with the aircon switched on. >> Stay informed about: 406 HDi Exec Cooling Fan |
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Joined: Jul 20, 2005
Posts: 19
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(Msg. 5) Posted: Tue Aug 02, 2005 3:29 am
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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the saga continues......
now I'm really confused, i have removed the front grill (one with peugeot badge on it) to gain access to the fan and on the near side of the single fan there is a long verticaly mounted black plastic box (part of the fan unit), and inside the box, wait for it....... 3 more relays 2 green ones the same rating as the ones down the side of the battery and one heavy duty blue one, after removal of the relays some of the connections were covered in green deposits/corrossion, i have cleaned them up and replaced them.
The large blue relay makes a definate click when I remove the temp. sensor plug and the fan kicks in at full speed so i assume that is working ok, there are also 2 plug connectors to the fan at the front from the relay box, theise are getting the full force of the british weather so i have cleaned up the connections on theise too.
All connected and currently idling to see what happens.... fingers crossed, will keep you informed >> Stay informed about: 406 HDi Exec Cooling Fan |
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Joined: Dec 13, 2004
Posts: 34
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(Msg. 6) Posted: Tue Aug 02, 2005 4:23 am
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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Hi, the 3 relay configuration fits in with my original post. The system seems to work as follows:-
relay A = speed 1 for above 90c (low speed engine cooling)
relay B = speed 2 for a/c cooling.
relay A+B =speed 3 for above 90c and high a/c gas pressure.
relay C = max fan speed for very hot engine.
Work out which reley is which!. The 2 resistors may be in the relay enclosure, if you need to check them out, but with a bit of luck the dodgy connectors will be the answer.
T. >> Stay informed about: 406 HDi Exec Cooling Fan |
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Joined: Jul 20, 2005
Posts: 19
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(Msg. 7) Posted: Tue Aug 02, 2005 5:08 am
Post subject: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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Jackpot!!,
Fan is now working properly, no warning lights, I can only assume that the 3 relays and fuses at the side of the battery box are redundant?, since the ones at the side of the fan are now all clicking happily,
Thank you very much for your assistance I know I wouldnt have be able to figure it out without your help,
Now to try to seal the black box from the weather.........
Thanks again >> Stay informed about: 406 HDi Exec Cooling Fan |
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External
Since: Jan 20, 2004
Posts: 140
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(Msg. 8) Posted: Thu Aug 04, 2005 10:55 am
Post subject: Re: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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>
> Jackpot!!,
>
> Fan is now working properly, no warning lights, I can only assume that
> the 3 relays and fuses at the side of the battery box are redundant?,
> since the ones at the side of the fan are now all clicking happily,
>
> Thank you very much for your assistance I know I wouldnt have be able
> to figure it out without your help,
>
> Now to try to seal the black box from the weather.........
>
> Thanks again
BONUS !
Have just been searching for similar prob & hopefully found the answer. My
fan will not switch off, ever. I have to disconnect the battery when i park
& reconnect when due to go again ! Hopefully this may work for me also.
Does anything break when grille/black cover is remeved ?
James >> Stay informed about: 406 HDi Exec Cooling Fan |
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Joined: Jul 20, 2005
Posts: 19
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(Msg. 9) Posted: Thu Aug 04, 2005 11:06 am
Post subject: Re: Re: 406 HDi Exec Cooling Fan [Login to view extended thread Info.]
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> Does anything break when grille/black cover is remeved ?
No comes off quite easily, with the bonnet up you can see 3 "push in" clips which fix the grille to the bonnet slam panel remove the centre of the clips with a sharp knife then the outer part should just pull out,
The bottom of the grille is held by 3 one way click fixers theise can be carefully manipulated out with fingers and/or screwdriver
the lid of the black box at the side of the fan is held in place by 4 moulded clips very easy to open, once you have sorted out the relays, i would suggest sealing the black box before assembly, I used silicone bath sealant.
Hope this helps >> Stay informed about: 406 HDi Exec Cooling Fan |
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