XJR6 radiator fan runs continuously.
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XJR6 radiator fan runs continuously.
Hi Fellas, I just collected my new toy yesterday. It's a 1994 XJR6 & so far so good. One thing is puzzling me, the radiator cooling fan runs continuously. Even when the engine is stone cold, as soon as I turn the key, the fan starts. Unplugging the engine coolant temperature sensor on top of the thermostat housing makes no difference, but it does stop if I unplug the cooling fan relay module, located behind the left hand headlamp. The dashboard temperature gauge stays very low as well. Does anyone have any thoughts, please?
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Thanks for that Andrew, but unfortunately this unit is not just a relay it is some sort of module/relay with many pins.
Hi RJ237, it is 1995 MY, but late 1994 build. Anyway, are you saying that it is correct for the fan to come on with the key even when engine is completely cold? If that is so then yippee! I don't have a dreaded electrical problem at all. It only has one fan on the right hand side of the rad. The left hand side just has some rubber flaps to let air through with increasing road speed.
Hi RJ237, it is 1995 MY, but late 1994 build. Anyway, are you saying that it is correct for the fan to come on with the key even when engine is completely cold? If that is so then yippee! I don't have a dreaded electrical problem at all. It only has one fan on the right hand side of the rad. The left hand side just has some rubber flaps to let air through with increasing road speed.
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The fans start running as soon as you turn the ignition key to where the dash lights up and before starting the engine.This is normal. There was a modification made to the XJ300 fans some time later. I suspect yours was modified. Keep in mind that the fans are designed to continue to run for some period of time after the ignition is switched off. This is controlled by a relay module
The most common problem people have experienced is that after the engine is shut off and the ignition key removed the fans continiously run thus draining the battery over time. These fans have 2 fuses located in the LH Engine Bay fuse box. F11 and F17
You should reach out to "SoGood" here who is located in Ireland and may give you some guidence.
I hope that helps you.
BigBossRadio Dallas TX formerly of Tramore Waterford
You may also want to check out the XJ300 E book at Jaglovers. Here is the link
Jag-lovers' Ebooks Book Index
The most common problem people have experienced is that after the engine is shut off and the ignition key removed the fans continiously run thus draining the battery over time. These fans have 2 fuses located in the LH Engine Bay fuse box. F11 and F17
You should reach out to "SoGood" here who is located in Ireland and may give you some guidence.
I hope that helps you.
BigBossRadio Dallas TX formerly of Tramore Waterford
You may also want to check out the XJ300 E book at Jaglovers. Here is the link
Jag-lovers' Ebooks Book Index
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Here is a a link to Jim butterworth's site...... He has many gems of wisdom for the XJ300 Jag owner..... You may want to check it out.......... and add it to your store of knowledge.
Hope it helps
Jaguar XJ6; Miscellaneous notes
Hope it helps
Jaguar XJ6; Miscellaneous notes
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GatorJoe (09-14-2015)
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At the risk of confusing the situation, my understanding of the fan situation is as follows:
-The fans will come on at low speed if required to do so by coolant temperature.
-The fans will rise to high speed if low speed isn't lowering the temperatures sufficiently
-The fans may stay on for a period after the ignition is switched off if the coolant temperature is high enough
- The low speed fans will come on IF THE AIRCON IS ON, regardless of coolant temperature.
It is worth being aware that Very early X300s had a different aircon pressure switch, which controlled the fans separately.
Please also note that your car may have been modified. There is a popular modification described in another thread whereby the low speed fans come on whenever the aircon compressor clutch is engaged. I modified my car, and it cuts down a bit on fan operation, as in our climate, the compressor doesn't need to be running the whole time to maintain cabin temperature.
-The fans will come on at low speed if required to do so by coolant temperature.
-The fans will rise to high speed if low speed isn't lowering the temperatures sufficiently
-The fans may stay on for a period after the ignition is switched off if the coolant temperature is high enough
- The low speed fans will come on IF THE AIRCON IS ON, regardless of coolant temperature.
It is worth being aware that Very early X300s had a different aircon pressure switch, which controlled the fans separately.
Please also note that your car may have been modified. There is a popular modification described in another thread whereby the low speed fans come on whenever the aircon compressor clutch is engaged. I modified my car, and it cuts down a bit on fan operation, as in our climate, the compressor doesn't need to be running the whole time to maintain cabin temperature.
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All you need to know about fan actuation can be found in the TSB's Bob put up in post #3: https://www.jaguarforums.com/forum/x...s-fail-148837/
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sparkenzap (09-16-2015)