Torque converter clutch won't engage GM

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  #1  
Old 03-06-08, 07:28 AM
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Torque converter clutch won't engage GM

It's a 89 supreme 4-speed automatic and the converter lock-in doesn't engage. I've engaged it by grounding the wire running to the ecm using a remote switch so the fault isn't in the trany. What's the most likely culprits. Just want better milage. P.S. No codes and the AC is disconnected.
 
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Old 03-06-08, 10:34 AM
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Mystery solved

Mystery solved. Turns out the coolant thermostat was too cool. Replaced it and the torque converter clutch engaged perfectly.
 
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