#1: Overheating With Stop Light Flashing Author: ReignSupreme, Posted: Tue Feb 05, 2013 11:10 am ---- It happened to me several months ago and now it's happening again. I'll leave the engine running and it'll reach normal temp (80-90C) and then the temp needle will shoot straight up into the red and the engine stop light will start flashing.
I'll restart the engine and it'll fall straight back down again. I have only just noticed that the cooling fan isn't coming on around (90C), is this normal?
#2: Re: Overheating With Stop Light Flashing Author: Dillon, Location: KentPosted: Tue Feb 05, 2013 12:02 pm ---- The cooling fan should come on at about 100, sounds like a dodgy temp sensor.
Best your going to get with out the rest of the critical details...
Engine?
serviced the cooling system?
Checked for leaks?
Correct coolant?
year of the car?
#3: Re: Overheating With Stop Light Flashing Author: ReignSupreme, Posted: Tue Feb 05, 2013 12:14 pm ----
Dillon wrote:
The cooling fan should come on at about 100, sounds like a dodgy temp sensor.
Best your going to get with out the rest of the critical details...
Engine?
serviced the cooling system?
Checked for leaks?
Correct coolant?
year of the car?
It's a 2001 1.4i LX model. I've checked coolant and had a look for leaks but found nothing. If I continue to drive, the needle will just go back down to 90 after a couple of minutes and then go up again a few minutes later.
#4: Re: Overheating With Stop Light Flashing Author: meady, Location: basingstokePosted: Tue Feb 05, 2013 12:31 pm ---- Sounds like a dodgy sensor as I doubt the temperature would fluctuate that much.
#5: Re: Overheating With Stop Light Flashing Author: kandlbarrett, Location: SwindonPosted: Tue Feb 05, 2013 1:12 pm ---- Temp can fluctuate with air trapped in system. Does your car use water? Have you topped it up recently?
The 1.4 has two sensors. The green one sends its signal to the ecu and that controls fuelling to make it correct for engine temp. The blue one sends the signal to the gauge - or I think it is that way around. You can prove it by disconnecting each in turn and one will make the gauge stop working and the other will probably affect engine revs either making them speed up or slow down.
It could be an intermittent defect on the sensor or you could have a loose or shorted wire from the sensor that is an intermittent fault. Last edited by kandlbarrett on Tue Feb 05, 2013 3:35 pm; edited 1 time in total
#6: Re: Overheating With Stop Light Flashing Author: ReignSupreme, Posted: Tue Feb 05, 2013 1:41 pm ----
kandlbarrett wrote:
Temp can fluctauate with air trapped in system. Does your car use water? Have you topped it up recently?
It doesn't usually use water, no. I haven't used it for almost two years so I topped the water up a bit earlier. Like I said, it happened before I stopped using the car for a while. I've just purchased a temp sensor so fingers crossed, that's the issue.
#7: Re: Overheating With Stop Light Flashing Author: kandlbarrett, Location: SwindonPosted: Tue Feb 05, 2013 1:52 pm ---- Check the connectors and wiring for shorts or worn insulation.
Is that a blue or green sensor? Does your car have aircon?
#8: Re: Overheating With Stop Light Flashing Author: ReignSupreme, Posted: Tue Feb 05, 2013 1:53 pm ----
kandlbarrett wrote:
Check the connectors and wiring for shorts or worn insulation.
Is that a blue or green sensor? Does your car have aircon?
I ordered the green one, I wasn't aware that there were two. Yes, my car does have aircon.
#9: Re: Overheating With Stop Light Flashing Author: kandlbarrett, Location: SwindonPosted: Tue Feb 05, 2013 3:46 pm ---- You have ordered the wrong sensor - I have checked the Haynes manual. I know some will say Haynes isn't always right but it was just to remind me what I did on my daughters car.
In fact, on this item, Haynes has a good description of the sensors on each model.
The green one is engine temperature to ecu. The blue one is engine temperature to gauge. The two sensors are entirely separate with no connection between them.
As you look at the car from in front of it the blue sensor is low down on the RH side of the cylinder head. It is a bit tricky to see and fiddly to fit. Not too hard but a bit of a faf.
Buy a Haynes, they may not be perfect but they are good for many things and save time waiting for answers.
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