T-series engine cooling fan inoperative

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Pencil Tip
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T-series engine cooling fan inoperative

#1 Post by Pencil Tip » Mon Aug 12, 2019 11:12 pm

I have noticed that my cooling fan is not operating when it should. I was sat idling at temporary traffic lights and noticed that the temperature gauge was above normal.

Is the sensor on the engine or is it the little one on the side of the radiator? Could it be a bad relay? If so, where is it located?

The fan actually works using an external power source.
1992 Rover 220 GTi (20 years of ownership)

2006 Opel Tigra Twintop 1.8 Exclusiv

1994 Rover 216 Coupe Auto

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Julesmat50
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Re: T-series engine cooling fan inoperative

#2 Post by Julesmat50 » Mon Aug 12, 2019 11:54 pm

Are you sure that isn't normal? Admittedly mine is a diesel, but my cooling fan doesn't cut in until the gauge reaches somewhere around 2/3 - 3/4 of max, so quite a way above the halfway point. If that ISN'T normal for you i.e. the fan has always cut in at a different point, but now doesn't and the fan works when operated outside, then suspect the coolant temp sensor for the fan, which I believe is the one in the radiator.
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Re: T-series engine cooling fan inoperative

#3 Post by 220 GSi turbo » Tue Aug 13, 2019 8:47 am

According to the Rover electrical manual, the normally aspirated and non-aircon T-series uses the same fan circuit as the 1.4 and diesel versions. (The turbo versions and cars equipped with aircon have a much more complex circuit controlled via the MEMS ECU).

Annoyingly, it doesn't mention the location of the sensor ("low temperature switch"), but it has two wires connected to it: light green with grey stripe and grey with blue stripe. The sensor circuit is fed from 15 Amp fuse no.15 in the dashboard fusebox.

The motor is fed from 20 Amp fuse no.4 in the engine bay fusebox, via a relay mounted in the same place which is triggered by the sensor mentioned above.

Hope that helps.....
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Pencil Tip
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Re: T-series engine cooling fan inoperative

#4 Post by Pencil Tip » Tue Aug 13, 2019 2:33 pm

Thanks for your help guys.
1992 Rover 220 GTi (20 years of ownership)

2006 Opel Tigra Twintop 1.8 Exclusiv

1994 Rover 216 Coupe Auto

Pencil Tip
Posts: 170
Joined: Thu Nov 20, 2014 6:28 pm
Location: Worcestershire

Re: T-series engine cooling fan inoperative

#5 Post by Pencil Tip » Tue Aug 13, 2019 5:18 pm

Okay. Both fuses are good, as is the relay. I disconnected and shorted out the radiator sensor wiring to fool the ECU into thinking the sensor has gone closed circuit, i.e. an over-temperature engine situation and the fan does work.

So, perhaps I can conclude that the radiator sensor is bad.

Does the coolant leak out if I remove the sensor? Perhaps a daft question, but just wanted to be sure.
Last edited by Pencil Tip on Thu Aug 15, 2019 3:09 pm, edited 1 time in total.
1992 Rover 220 GTi (20 years of ownership)

2006 Opel Tigra Twintop 1.8 Exclusiv

1994 Rover 216 Coupe Auto

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1234dist
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Re: T-series engine cooling fan inoperative

#6 Post by 1234dist » Tue Aug 13, 2019 6:05 pm

The t-series has a 2 stage fan. low/high but also (on a nasp) the second fan is mainly only used for the air con.

Don't know if that helps.
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Re: T-series engine cooling fan inoperative

#7 Post by Pencil Tip » Tue Aug 13, 2019 6:21 pm

Thanks for the info.

Yes, mine has a second smaller fan in front of the a/c condensor. What does the 2 stage fan actually do? Mine has only cycled on and off during prolonged engine idling.
1992 Rover 220 GTi (20 years of ownership)

2006 Opel Tigra Twintop 1.8 Exclusiv

1994 Rover 216 Coupe Auto

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Re: T-series engine cooling fan inoperative

#8 Post by 1234dist » Tue Aug 13, 2019 8:40 pm

basically, if the first speed is not enough to keep consistent or lower the temp, or the temp rises too quickly it will spin faster
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220 Coupe turbo K785OAT
218 VVC Cabriolet R220OVR
220 GTI M-series J777RAL
Mercedes C270 diesel P80CJM
620 SLI P267LOM HONDA
420 GSI Turbo L191CVP

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Re: T-series engine cooling fan inoperative

#9 Post by Pencil Tip » Wed Aug 14, 2019 6:47 am

Ah, no mine just has one fast speed.
1992 Rover 220 GTi (20 years of ownership)

2006 Opel Tigra Twintop 1.8 Exclusiv

1994 Rover 216 Coupe Auto

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