90 XJS original Electric fan question
#1
90 XJS original Electric fan question
Hi Guys,
Just curious how you can check to make sure if the electric fan works or not. Take it on a long drive and then park it and turn off? Should it run when the car is off? My 90 XJS has always stayed below the N on the gauge but I never really noticed if the fan runs or not. Where I live its mostly rural driving and not stop and go.
I actually was just sitting here this morning and this question popped into my head. LOL. I'm in Wisconsin so the crappy weather really wont let me drive it for a few days to check it out. Thanks...
Just curious how you can check to make sure if the electric fan works or not. Take it on a long drive and then park it and turn off? Should it run when the car is off? My 90 XJS has always stayed below the N on the gauge but I never really noticed if the fan runs or not. Where I live its mostly rural driving and not stop and go.
I actually was just sitting here this morning and this question popped into my head. LOL. I'm in Wisconsin so the crappy weather really wont let me drive it for a few days to check it out. Thanks...
#2
It changed with various models, but in principle yours will be one of:
Greg
- Comes on 100% of the time with the aircon, will run on post shutdown if water temp sensor warm enough
- Comes on with aircon if certain conditions met (do not know what they are), will run on post shutdown if temp sensor warm enough
Greg
#3
Join Date: Mar 2008
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Yeah, it gets a little weird 1989-later. I was just looking at a 1989 schematic and there is no tie-in with the climate control at all after vin 156989. It's purely coolant-temp triggered. But the post-shutdown cooling capability remains.
Probably best to find an actual 1990 diagram.
In some cases the climate control wiring and functions are different between coupes and convertibles....which *might* include differences in the elect fan circuit as well..
Cheers
DD
Probably best to find an actual 1990 diagram.
In some cases the climate control wiring and functions are different between coupes and convertibles....which *might* include differences in the elect fan circuit as well..
Cheers
DD
#4
You guys know I'm not into electric/schematics. LOL... At least with your help, I fixed my power window issue. I was lucky it was just the breaker.
I really have not paid any attention to the electric fan because the temps have always been slightly below the N on the gauge. My vin is 174 something and I was curious if it always ran or not. I do know it does not run when I have the car idling in the driveway. I probably should give the car a good run and see if it does kick on. Thanks.
I really have not paid any attention to the electric fan because the temps have always been slightly below the N on the gauge. My vin is 174 something and I was curious if it always ran or not. I do know it does not run when I have the car idling in the driveway. I probably should give the car a good run and see if it does kick on. Thanks.
#5
You guys know I'm not into electric/schematics. LOL... At least with your help, I fixed my power window issue. I was lucky it was just the breaker.
I really have not paid any attention to the electric fan because the temps have always been slightly below the N on the gauge. My vin is 174 something and I was curious if it always ran or not. I do know it does not run when I have the car idling in the driveway. I probably should give the car a good run and see if it does kick on. Thanks.
I really have not paid any attention to the electric fan because the temps have always been slightly below the N on the gauge. My vin is 174 something and I was curious if it always ran or not. I do know it does not run when I have the car idling in the driveway. I probably should give the car a good run and see if it does kick on. Thanks.
Greg.
#6
So, I should disconnect both connections from the water pump and touch them together with the ignition key in the 1 or 2 position? Or run a wire between the two, while they are still connected to the water pump? The electric fan should then run? I wish you guys lived near bye. LOL... Thanks for your help.
#7
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#9
I pulled the two connectors, attached them to a 30 amp fuse, then turned the ignition to 1-2 position and the fan came on... That made my day guys. LOL. The connectors and thermo switch looked pretty dirty, so I cleaned them up and reconnected them. They were very loose, so I also tightened them up a little for a better connection. The next time I am on a long run, I will check the fan while idling and after turn off and will see if the fan runs... If the fan does not run, maybe its the thermo switch. Do those go bad? Thanks for your help guys.
#10
Greg
#11
as this is the over run thermostat , you can put the connections together even without the ignition switch on , or even in,
as when you turn off and leave the car , the fan continues to run using this stat ,
i used this same thermostat/switch to run my full electric setup ,
and it works very well ,
BB
as when you turn off and leave the car , the fan continues to run using this stat ,
i used this same thermostat/switch to run my full electric setup ,
and it works very well ,
BB
#12
as this is the over run thermostat , you can put the connections together even without the ignition switch on , or even in,
as when you turn off and leave the car , the fan continues to run using this stat ,
i used this same thermostat/switch to run my full electric setup ,
and it works very well ,
BB
as when you turn off and leave the car , the fan continues to run using this stat ,
i used this same thermostat/switch to run my full electric setup ,
and it works very well ,
BB
How did you use the thermo switch to run your full electric setup? Thanks.
#13
I did drive the car today for around 45 minutes and the gauge stayed right at the very bottom of the N on the gauge. Man, this car drives like its brand new, I love it. LOL.
The electric fan did not turn on when I parked and turned off the XJS... Since its only 55 degrees here in Wi, maybe the electric fan just will not turn on because its just not running hot enough. If it was summer, maybe it would... It is a 1990 XJS, so maybe the fan does not run unless it gets above a certain temp. Thanks.
The electric fan did not turn on when I parked and turned off the XJS... Since its only 55 degrees here in Wi, maybe the electric fan just will not turn on because its just not running hot enough. If it was summer, maybe it would... It is a 1990 XJS, so maybe the fan does not run unless it gets above a certain temp. Thanks.
Last edited by XJSFan; 04-19-2014 at 11:23 AM.
#14
#16
I am actually thinking of finding a M22 X 1.5 two position switch that comes on around 10 degrees earlier then the original one does. From what I have read, it sounds like around 96C it switches on then goes off around 91C. I thinking a 85C switch might be better... Some recommend the 82/77 switch but the fan may run too often.
#17
#18
#19
Luds
if linking the wires on the thermostatic switch, ignition on, does not make your aux fan work, but hot-wiring it does, then as you say the problem is getting current to the wire to the switch. The fuse is the one nearest to the front of the car on the US driver's side inner wing fuse box, by the bracing strut. The fuse may be burnt out or just a bad one, and there may be bad connections on the fuse holder itself. There should be current at the fuse, igniton on.
The relay for the aux fan is under the plastic cover on the engine side rear of the US driver's side headlight nacelle. There are three there: top = headlights, middle = horn, bottom = aux fan.
If these all check out and there is current to the aux fan from the relay and still the fan does not come on, the thermo switch is suspect.
Greg
if linking the wires on the thermostatic switch, ignition on, does not make your aux fan work, but hot-wiring it does, then as you say the problem is getting current to the wire to the switch. The fuse is the one nearest to the front of the car on the US driver's side inner wing fuse box, by the bracing strut. The fuse may be burnt out or just a bad one, and there may be bad connections on the fuse holder itself. There should be current at the fuse, igniton on.
The relay for the aux fan is under the plastic cover on the engine side rear of the US driver's side headlight nacelle. There are three there: top = headlights, middle = horn, bottom = aux fan.
If these all check out and there is current to the aux fan from the relay and still the fan does not come on, the thermo switch is suspect.
Greg
Last edited by Greg in France; 05-05-2014 at 04:23 AM.