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MY WIFES 89 GT'S GOT A PROBLEM WITH THE COOLING FAN & A/C, THEY BOTH STOPED WORKING ABOUT 5 DAYS AGO. I'VE CHECKED ALL THE FUSES,RELAYES,FUSEABLE LINKS & THE COOLING FAN-A/C CONTROL BOX. I'VE EVEN PUT ANOTHER FAN ASSY. ON THE CAR :evil: . PLEASE HELP.
THANKS,
CASPER
 

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OKAY CASPER, YOU DONT HAVE TO YELL AT ME, I AM NOT DEAF :)
it's probably the thermostat not sending the signal to turn on the fan...

concerning the AC, when you hit the AC button, can you feel the compressor bog th engine down?
 

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Pull the connector off the colling fan thermostat and jump the wires in the connector. This should see if the thermostat switch is the culprit.
 

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Two different cars. The fan on my 92 lx takes forever to come on but when it does its at the high end of normal. My 86 wagon came on much sooner. The main thing is that they came on. I check my fan operation in the summer by pulling over and waiting for it to come on. I always do it on a road where if the fan doesnt come on and the guage soars I can pull out and cool the car off without running into traffic. I probably do this once a month. Back to your cars gauges and fans. There are many varables to consider.The temp guages and their sensors could be off calibration. The fan temperature sensor might be off 10 degrees between the two cars. Radiator caps, thermostat,cooling system corosion and antifreeze condition all come into play. Years back I had a 122 Volvo that after I flushed the cooling system it started running hotter. I thought running more than 50-50 mix would be better. I was wrong.As soon I added more watter to the mix it ran cooler.
 

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thermostatic fan switch

the thermostat and thermostatic fan switch are two different devices. The thermostat opens coolant into the engine via a bimetallic spring gizmo, it has a temp that it opens which is typically 195 degrees on 1st gens. (I have a 180 degree stant in mine for extra early cooling).

The thermostatic fanswitch is threaded onto the thermostat housing and has the electrical connector for the fan, it operates at a different temp, which I believe is 220 degrees. If you changed the fan, your likely culprit is this switch. I recently tried to remove mine, but the sucker was welded on, so I pulled a new housing with switch from a junkyard that looked like it saw minor use. All works well now. If junkyard pullin isnt an option, zxtuner.com has some low temp thermos and fan switches for the 1st gen. good luck.

=browntown= 90lx
 

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Newer non-GT Escorts:

2 temperature sensors. One for the gauge and one for everything else.

Older Escorts:

3 temperature sensors: One for the gauge, one for the cooling fan, one for the computer.

Yours has one for the cooling fan. It looks just like the one for the computer. On my 1995LX, they look like this:



The one for the gauge looks like a lot like this:



This is a good webpage on Coolant Temperature Sensors:
http://www.lotuselancentral.com/cts.htm
 
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