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Posted by Dana [Email] (#2822) [Profile/Gallery] (more from Dana) on Fri, 19 Apr 2002 08:25:15 Share Post by Email
In Reply to: overheating and fan problem, Brian M., Thu, 18 Apr 2002 16:25:53
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The water passages of the radiator are horizontal from right to left. The location of the electrical t-stat switch is the top left outlet. This is not the location of the main radiator outlet hose which is located at the bottom left corner. If the top radiator cooling water passages become partially plugged the t-stat switch is seeing cooler water than the bottom passages at the outlet manifold. Because of this the switch activates the fans at temperatures higher than expected if at all. Yet the switch is good. An infared temperature probe reading of the radiator channels vertically at the outlet of the radiator will show this...i.e. cooler temperatures at the top, warmer or hot flow at the bottom. This is what I saw in my own radiator before I replaced it.

On my 85, the AC cooling fan (drivers side) will only come on with the t-stat switch jumpered when the car is running. If the car is not running then only the right hand side (pass. side) will come on if the switch is jumped for testing. On my 85, the fuses for the AC and Standard radiator fans comes from two separate fuse sources. The fuse for AC fan is only activated with power when the ign key is in the run mode. The standard fuse is always powered but I have the time delay relay between the fuse and t-stat switch (which I now have jumpered).

posted by 129.57.9...

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