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hey guys, i have an overheating problem on my 2003 gt with about 170k miles on it and my friend told me to go here for help. i stopped driving this car awhile back and and let it sit for a few years, i’m trying to get it back up and running but my only problem is that it overheats fast. my radiator fans aren’t spinning even with air conditioning and smoke starts to come from behind the engine on the passenger side, any ideas on how to fix?
 

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2001 Spyder GT
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584 Posts
I'd start with getting your fans to run properly. When you turn on the AC, the passenger side fan should come on even with a cold engine. With the AC off, the fans will come on when the engine coolant temp reaches 230°F. If you disconnect the ECM engine coolant sensor wire connector (there's two; you want the larger one with three wires instead of two) near the thermostat, the fans should come on immediately. That's an easy way to check whether the problem is lack of power to the fans, or a problem with the temperature sensor itself.

If you can't find the connector or if you discconect the sensor and the fans don't run, start by checking fusible link #2 and fuse #9 (20A) under the hood. Then test your fan control relay A-09X with a multimeter. After the relay, the next component is the fan controller, mounted to the driver's side fan.

The other thing to check is the engine coolant temperature sensor itself. If there's a problem with the sensor, the ECM might think the engine is always cold, even when it's hot, and never turn on the fans. A good way to check it is to connect an OBD reader, and compare the engine coolant temperature reported by the OBD against the gauge in the cockpit. They're separate systems so you can compare them and they should be in the same ballpark.

Now, you said your car overheats quickly so it's possible that you have a mechanical problem as well, like low coolant, a sticky thermostat, blown head gasket, etc. So there may be more to do once you get the fans working correctly.
 

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Are you judging that it's overheating because there's smoke coming from the rear of the engine or does the temperature gauge rise past the halfway mark?
 

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2001 Spyder GT. Koni adjustable shocks. cold air intake, ST sway bar.17X8.5 rims. LED headlights.
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756 Posts
I agree with Bitter. I would diagnose the fan issues first. I keep some small jumper wires with alligator clips in my tools for this kind of stuff. I would just jumper out the fan switch plug and start it up. Or you may find you have a fuse blown. These cars MUST have fans, especially after the EGR kicks in. ...J.D.
 
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