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well I think you got it correct.. the one on the driver rear is stated to be the glow plug inhibit ..(per auto supply houses) but that could be the wrong description. If its working then it the correct one.

the glow plug inhibit is on the passenger side in the rear.

Coolant Temperature Sensor | 1986 Chevrolet K30 1 ton P/U 4WD 8 Cylinders J 6.2L Diesel | AutoZone.com

that one is the the warrning light... the one in the front of the head. There should be a two pin sensor in the rear of the passanger side of the head. That one also controlls the glow plug card. here is the autozone # SU183 for the rear lower right side one. you have the top one already.

there civy parts... take them out and match them up to make sure but there the same as the civy units for a 1983 chevy J code 6.2 diesel. I just replaced them in my pop in laws truck.. I cant seam to find them at the autozone web site, but napa had them. Just take them out and the can match...

you answered your own question. But, when I start it COLD I can hear the glowplug solenoid cycle and the 'wait' light comes on as normal and it starts on the first pop even in cool weather. But, after it warms up, if I try to restart it in the next, say, 15-20 minutes it restarts pretty well...