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 Posted: Mon Jan 25, 2016 1:22 pm |
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Joined: Mar 21, 2010
Posts: 75
Trade Rating: 0
Location: Devon
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A lady friend of mine has bought a 206 glx (W reg)
At first the engine was overheating and the fan would not come on. Looking at the relays there was corrosion to the pins and one of the wires had gone.
I've repaired the wire, and the fan comes on when the engine overheats or I unplug the temp sensor on the engine.
Now the problem is that all of a sudden out of now where the temp dial will max out, the fan will kick in and I get the red stop sign on the dash. It does this for a few seconds and then the temp returns to normal.
Any ideas?
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Posted: Mon Jan 25, 2016 6:31 pm |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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My W-plate 2.0 HDi gets its temp dial to jump up as soon as I turn to ignition. I thought is its way to reset/calibrate, as it goes back down shortly.
And since that dirty derv never gets really hot, it's driving without a fan, so I cannot tell if the fan would start then. Sorry to be of little help, but thought I'd share this needle jumpiness (as apparently it doesn't happen for e.g. PezHdi, who was mistakenly alarmed by seeing this on my dashboard)
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Posted: Tue Jan 26, 2016 4:16 am |
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Joined: Jun 19, 2010
Posts: 1600
Trade Rating: +4
Location: South Bucks
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Possibly needs a new temp sender .. my 1.4 HDi did that and the new sender sorted it out.
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| Down to just the 1.4 HDi. Cayman Green 2.0i CC sold. | |
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Posted: Tue Jan 26, 2016 4:19 am |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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Out of interest, has the needle ever jumped whilst engine on for you? And how many times per trip?
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Posted: Tue Jan 26, 2016 6:42 am |
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Joined: Feb 16, 2010
Posts: 440
Trade Rating: +2
Location: Devon
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Had the exact issue on a 2.0HDi, even though the car had drive a mile down the road, gauge would go sky high and stop light would come on.
New green coolant sensor and all was well.
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Posted: Tue Jan 26, 2016 10:00 am |
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Joined: Mar 21, 2010
Posts: 75
Trade Rating: 0
Location: Devon
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Thanks for the information to those who've posted.
I've been having a look and as the car has a digital climate control A/C, I've checked and the low speed of fan is not working either.
I think the low speed fan should come on when A/C is needed or as the engine heats up a little.
Am I right in thinking that if the ECU tries and puts the low speed of the fan on, it will throw a wobbler and engage the high speed fan on tricking the instruments that its overheating?
Could this be either a faulty relay ( they were quite corroded ) or a faulty low speed fan resistor?
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Posted: Tue Jan 26, 2016 10:22 am |
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Joined: Feb 10, 2010
Posts: 4266
Trade Rating: +4
Location: Palestine
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| mcfly666 wrote: |
Thanks for the information to those who've posted.
I've been having a look and as the car has a digital climate control A/C, I've checked and the low speed of fan is not working either.
I think the low speed fan should come on when A/C is needed or as the engine heats up a little.
Am I right in thinking that if the ECU tries and puts the low speed of the fan on, it will throw a wobbler and engage the high speed fan on tricking the instruments that its overheating?
Could this be either a faulty relay ( they were quite corroded ) or a faulty low speed fan resistor? |
Well when you turn A/C on,the low speed should come on,if not,then you have a problem with your cooling fan that you need to find out,try to replace the relay,or clean it with contact cleaner.
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Posted: Tue Jan 26, 2016 10:29 am |
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Joined: Feb 10, 2010
Posts: 4266
Trade Rating: +4
Location: Palestine
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Also you might have a faulty temp sensor,keep that in mind.
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Posted: Tue Jan 26, 2016 11:18 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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A/C system could also be low on gas pressure & the system protection switch could be preventing the A/C system from engaging the compressor clutch.
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| Toyota C-HR GR Sport 2.0 Hybrid with JBL & Alcantara packs. | |
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Posted: Tue Jan 26, 2016 1:10 pm |
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Joined: Mar 21, 2010
Posts: 75
Trade Rating: 0
Location: Devon
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Thanks again guys, the A/C works, I can hear the compressor clutch kicking in and the lights dim slightly until the alternator takes up the slack and the engine revs change a bit too.
I've got a low speed fan resistor in the post as we speak, Temp sensor seems fine as when I unplug it the engine automatically goes into hot mode.
Circulation between top and bottom radiator hoses also seems good.
I think the problem lies with the wiring to the low speed fan relay, the relay itself or the low speed fan resistor.
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Posted: Tue Jan 26, 2016 2:18 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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How do you know slow speed fan isn't working It isn't easy to tell as you won't hear it unlike high speed. Inside the engine bay you will feel the air being drawn through the radiator but you are very unlikely to hear the fan running over the engine noise.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
Why isn't my daughter an Alfaholic? | |
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Posted: Tue Jan 26, 2016 5:07 pm |
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Joined: Jun 20, 2012
Posts: 1171
Trade Rating: +1
Location: West Country
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| kandlbarrett wrote: |
| How do you know slow speed fan isn't working |
By looking at it? 
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Posted: Thu Jan 28, 2016 9:47 am |
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Joined: Mar 21, 2010
Posts: 75
Trade Rating: 0
Location: Devon
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Seems like replacing the two speed fan resistor had sorted the problem.
Low speed kicking in first either when air con is on, or engine is mildly overheating. If low speed does not work the ECU throws a wobbler and simulates max heat reading to kick in the high speed fan.
At least thats my theory.
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Posted: Thu Jan 28, 2016 10:19 am |
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Joined: Nov 27, 2010
Posts: 11520
Trade Rating: +10
Location: What's it to you? ? ?
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The system is designed so the ecu knows if the cooling fan has been commanded to run but the fan itself hasn't responded.
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| Toyota C-HR GR Sport 2.0 Hybrid with JBL & Alcantara packs. | |
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Posted: Thu Jan 28, 2016 2:56 pm |
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Joined: Mar 21, 2010
Posts: 75
Trade Rating: 0
Location: Devon
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Yeah, awesome bit of engineering. I can see why a resistor needs airflow. But keeping the relays where they are right behind the grill is just asking for trouble.
If I can be bothered I will splice into the loom as it runs down the right hand side of the fan and keep the relays tucked up behind the nearside headlight.
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