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PostPosted: Sat Jul 08, 2017 3:09 pm 
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Joined: Wed Apr 05, 2006 12:47 pm
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Location: south wales
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Hi need some help with a over heating/fan issue on a ST205
i belive the problem is the fans as when driving the cars temps are fine
if the car is stationary in traffic the temps rise quite sharply

i know there are set things to check this, so id like someone to go through these step by step
im no mechanic but im competent at fixing things, so bare that in mind with any replys
as i would need basic instructions, including the location on any sensors that need un-plugging/checking

thanks in advance


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PostPosted: Sat Jul 15, 2017 2:38 pm 
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know one at all got any advise or help?


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PostPosted: Sat Jul 15, 2017 3:22 pm 
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Joined: Wed Jul 13, 2005 12:14 am
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Location: Camberley, Surrey
Car Model: ST205
Are the fans actually running? If you leave the car idling do they come on after a while?

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PostPosted: Sun Jul 16, 2017 9:12 pm 
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Location: Bournemouth
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For some reason I missed this in the view active topics list until today.

To test the fan system, unplug the fan switch on the bottom of the radiator and the fans should run all the time with ignition on (The switch is normally closed and opens when hot).

It does sound most like fans not working, but there are other possibilities. If the heater goes cold when idling / overheating check the following:
- It's not unknown for the water pump impeller to become detached from the shaft leading to poor circulation.
- Check the coolant is full in the radiator (not the overflow tank). Headgasket failure is rare on the 205 but cracked blocks aren't unknown. If it keeps blowing coolant out then it could be a sign.

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PostPosted: Sun Sep 10, 2017 12:30 pm 
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sorry for the delay as ive been away working im back now so now able to except help!

basically as asked, the fans are non functional, meaning they do not come on at all
is this a fan issue or could id be sensor related?
are both fans connected? as in, if one fails the other will not work also?

my main concern is diagnosing the problem correctly, so i can replace the parts that need replacing
and not working my way through parts that (might) be faulty

so i appreciate any/all help and advise


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PostPosted: Sun Sep 10, 2017 3:42 pm 
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Location: Camberley, Surrey
Car Model: ST205
Nibbles will be able to advise better but I would imagine the first step is to establish if this is a mechanical or an electrical problem.

Get the multimeter out and a spare car battery - see if you can power up the fans via the disconnected plug. One of the fans only normally runs when the AC is on as far as I remember.

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PostPosted: Sun Sep 10, 2017 4:25 pm 
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Thanks, maybe worth a mention with regards to the fans, ive had the AC removed sometime ago
are you saying that only one of the fans actually keeps the Rad cool? or have i missunderstood


as far as sensors go, id have to have exact location, to make sure im checking the right one
i believe its lower bottom right of the rad fans (facing the car)?

or is this in the relay


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PostPosted: Wed Sep 13, 2017 1:49 am 
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The sensor that runs the fans is on the bottom tank of the rad nect tp the exit hose. Unplugging this should make the fans run constant with ignition on as this feeds a normally closed relay.

There is also a pressure switch on the aircon plumbing near the diagnostic connector which activates a fan if disconnrcted, It's possible this was removed with the aircon then the fans disabled to stop them running constantly.

Anyway, try unplugging the sensor to confirm whether ir's a sensor issue.

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PostPosted: Wed Sep 13, 2017 9:25 pm 
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Big thanks for the info, with regards to the Air con

this was removed quite some time ago, the Fan issue is only recent

i will check advised over the weekend and report back on monday


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