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Followup To
Question -
as per previous e-mail about my 92 acclaim with the temperature problem but i have gotten that fixed but I do have another question concerning the coolant temp sensor for the fan. I had taken the thermostat out but I am still having the problem of the fan not coming on sooner is there a way to bypass the coolant sensor without unpluging it cause if i do and turn off car it won't crank back up and also engine light comes on.
Answer -
Hi again Richard,
The coolant temp sensor is not just for the fan operation it
is also needed by the engine control computer to determine the fuel/air mixture to be appropriate for the temperature of the engine. So disconnecting that sensor is not an option. If you believe that it is preventing the fan from operating soon enough, then it would be worth measuring the resistance across its terminals. With the engine at 70F it should read in the range of 7,000 to 13,000 ohms,and when the engine is at normal operating temp 200F it should read in the range 700 to 1,000 ohms.
If the resistance when the temp gauge is above mid-scale is not in this range but is higher, then perhaps replacing the sensor will solve your problem.
If you have a 2.2 or 2.5L engine the other possibility of why the fan is coming on late is that you have air trapped in the thermostat housing, and that might through off the sensor from reading the true temperature of the coolant. I suggest that you open the plug on the top of the housing when the engine is cool, and if the coolant isn't full to the top of the housing then add enough water to fill it to the top. Then put a little grease on the threads of the plug and reinsert it. I believe it uses an 8mm allen head wrench for removal.
yeah it does but the thing is someone had stripped the area for the allen wrench out so I have no way of getting it out, so that is another problem, but I have found I could push the button for the a/c and it will bring it down. so what about just straight wiring the fan with the coolant sensor still plugged in?
AnswerHi Richard,
I think I have a better solution: remove the thermostat and simply drill a 1/16" hole in the flange area {between the outer edge and the valve opening} (this type of bleeder hole is used in many thermostats}. Ask a parts clerk to show you one for a different car that has such a hole if this is unclear. Other owners of these 4 cyl. engines have resolved this issue successfully by this simple fix. Then you will have no more air trapping problem and your fan will work properly and you will also have a properly sensing coolant sensor. Don't ask me why Chrysler wanted a thermostat without the bleed hole, but it must not be too significant because it seems to fix the problem of air entrappment.
Roland
