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SUMMER IS HERE! And the old trusty 240 is overheating....again. (AT IDLE, espeically with AC ON 200

Hello all, been battling an overheating 88 240. It doesn't matter if it's 0 degrees or 100 degrees out (more so when hot), if I'm at idle and the ac is on the temp gauge creeps up. Once I turn the heat on, and/or get up to high way speeds, temp sits at a comfortable level.

Heres what I've done:

Fan clutch (pulled from a junkyard clean low-mileage 740 with body damage)
thermostat (atleast 3 in the last 2 years)
radiator flush & fresh coolant
temp comp board & temp gauge
water pump (within last 2 years)

Motor has good compression and plenty of power (for a 240) so I don't think it's a head gasket issue, but I can't seem to figure it out, and it's really starting to bug me.

On a side note, AC does not really work. Recharged the system, which didn't help, and clutch on compressor operates, but no cold air inside car.

FINAL QUESTION: There is a flimsy, black, plastic fan IN FRONT of the radiator, behind the grill. Is this an electric fan that is ever supposed to be on? I have never seen it turn. (of course, I have not checked it while driving, but if I ever find a brave enough candidate I will surely check).






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