I have an 87 z28. Was a 305 with cc carb. Now it has a non cc carb and 350. Its just about ready for the road but I want to make sure the cooling system is safe.

I have the stock fan (single electric fan) wired to a 20 amp toggle to turn it on and off. It blew a 20 amp fuse once. Now I have a 30 in at the moment. I was wondering what the fan draws and if its getting old and drawing to much.

Is a 20 what its supposed to be or do I need a 30 in which case i would need a higher amp toggle switch. I also read on the internet that the intail draw is always high for a second then drops so maybe a 30 fuse and 20 switch would be alright.

 

You should really use a fan controller rather than a toggle. Why risk your new motor setup because you forget to flip the switch? I run a Flex-a-lite fully adjustable fan controller - it's $100 but worth every penny. Had it 4+ years now with no issues at all - probes the rad for temp input, has provisions for a toggle, range of 160 to 220 for fan on temp, easy to wire - a really great product!

But if you insist on just a toggle, you should wire in a relay so you're not running all that amperage into the car cabin and the toggle switch. The toggle sends low amp 12v to the relay to energize it, then the relay gets power directly from the battery to run the fan. I think the most useful thing I've learned about auto electronics is how to use relays.

 

Go look here and scroll down to Nina's post for a good manual switch wiring diagram
https://www.thirdgen.org/forums/cool...wont-turn.html

 

deffinately set up with a relay