I've got a thin metal (Auto Zone-type) fan and it works good enough.
I haven't dealt much w/ going from pulley fan to electric fan so my help is limited.
The fan does its biggest contribution in cooling when the car is at lower speeds. So it doesn't seem like it has the cooling capacity it needs to keep the radiator cool enough in stop and go traffic. Maybe the electric fan isn't coming on when it should.
Have you tried to crank it in your yard and let it run in 'park' for a while to see if it overheats b4 the fan comes on? If the temp shoots up and the electric fan doesn't come on, that would be a problem.
This is all considering that it was doing fine b4 the switch to the electric fan. Just some thoughts.
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'79 Mustang Coup
4" Cowl
Weld wheels (15x6;15x8)
Stock 5.8L
C4 w/ shift kit
1 5/8" MAC shorty headers
Holley 750 CFM
Edelbrock Performer RPM intake
2.5" Off road H-pipe, 2-chamber Flowmasters
8.8" Rear end w/ 3.55 gears (Now that's more like it!!)
Front: 225/60/15 Rear: 255/60/15 Eagle GT II
14 x 4” K&N air filter (getting the Xtreme setup soon)
"Red, thou art my companion. Hasten now your quickened metamorphosis to Green that I may conquer all who dare abide there beside me. May they be left thither behind burnt black." ---Fox Body
[This message has been edited by Fox Body (edited 04-06-2001).]