Dave in Texas Posted May 25, 2008 Report Share Posted May 25, 2008 1987 DeVille. This is electrial part, between the fan control relay and the fan control module (Red 14G wire in/out). The schematic shows it to be a solenoid, and I assume the bolt that secures it to the frame is its' ground but I don't have a clue to it's function. Filter? Whatizit filtering? I've been chasing a telltale-light problem for a long time: "Coolant Temp/ Fan" telltale light will illuminate immediately after turning the AC system On. Once the car reaches about 40mph the light goes Off.....each/every time. Same happens in slow traffic/idle/etc. 40mph is the key apparently, so I don't understand if it is a air-flow problem, or this 'fan control fillter assembly' unit is the cause. Telltale does not come On in Econ mode...ever. I've chased the down grounds and done the diagnostic tree procedures and all is correct. If anyone knows anything about this FCFA, I'd sure appreciate knowing what it does. Nothing at all about it in the SM and the ACDelco guys don't have in in their books. The number on the unit is: X1631939. Plugging that number in gives no response. I'm stumped. Thanks for any 'light' anyone can shine on this FCFA. Dave IMG.pdf GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
Dave in Texas Posted May 25, 2008 Author Report Share Posted May 25, 2008 1987 DeVille. This is electrial part, between the fan control relay and the fan control module (Red 14G wire in/out). The schematic shows it to be a solenoid, and I assume the bolt that secures it to the frame is its' ground but I don't have a clue to it's function. Filter? Whatizit filtering? I've been chasing a telltale-light problem for a long time: "Coolant Temp/ Fan" telltale light will illuminate immediately after turning the AC system On. Once the car reaches about 40mph the light goes Off.....each/every time. Same happens in slow traffic/idle/etc. 40mph is the key apparently, so I don't understand if it is a air-flow problem, or this 'fan control fillter assembly' unit is the cause. Telltale does not come On in Econ mode...ever. I've chased the down grounds and done the diagnostic tree procedures and all is correct. If anyone knows anything about this FCFA, I'd sure appreciate knowing what it does. Nothing at all about it in the SM and the ACDelco guys don't have in in their books. The number on the unit is: X1631939. Plugging that number in gives no response. I'm stumped. Thanks for any 'light' anyone can shine on this FCFA. Dave Here is schematic IMG_2.pdf GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
Dave in Texas Posted May 27, 2008 Author Report Share Posted May 27, 2008 I've been chasing a telltale-light problem for a long time: "Coolant Temp/ Fan" telltale light will illuminate immediately after turning the AC system On. Once the car reaches about 40mph the light goes Off.....each/every time. Same happens in slow traffic/idle/etc. 40mph is the key apparently, so I don't understand if it is a air-flow problem, or this 'fan control fillter assembly' unit is the cause. Telltale does not come On in Econ mode...ever. I've chased the down grounds and done the diagnostic tree procedures and all is correct. If anyone knows anything about this FCFA, I'd sure appreciate knowing what it does. Nothing at all about it in the SM and the ACDelco guys don't have in in their books. The number on the unit is: X1631939. Plugging that number in gives no response. I'm stumped. Thanks for any 'light' anyone can shine on this FCFA. Dave Here is schematic Ok I found out what the thing is. Electrical noise filter! Was not the problem cause. I need a fan-control module. Hope I can find a good used one, because I sure can't afford the new! Thanks. GM Reman 4.1 engine Dec '08 Link to comment Share on other sites More sharing options...
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