CJ5 AMC360 Ford Taurus 2 speed fan wiring

[akguy09]

I have a I6 (258) radiator in my Jeep J-10 with a 304 and its perfectly fine cooling my engine even when its 95 in Colorado.

I do have the mechanical fan though

 

[D_JEEPER]

I have a I6 (258) radiator in my Jeep J-10 with a 304 and its perfectly fine cooling my engine even when its 95 in Colorado.

I do have the mechanical fan though

This 360 has some performance mods so maybe putting out a bit more heat. I dunno... I figure the 4 row wont hurt for the summer slow speed wheeling trips.

 

[D_JEEPER]

My brother's stock radiator cools his 360 with the contour fans. I'd pressure test your system and inspect the cap.

My Uncle had overheating problems on his 304 and it turns out the vacuum relief valve on the cap was not working, it should be tight to the bottom seal not hanging down like in this pic:

I'll check that next time I am out there :)

 

[Rockwood]

It is an old 304 type. I figured it would be sufficient, but driving down the road at 60mph (kinda max I want to hold the revs) it will creep up ot like 210, then once it touches 220, it takes off. If I pop the hood it cools down pretty quick but the fan is absolutely screaming to make it do so haha.


My Fan thermostat switch popped out when driving the other day and it got up to like 230 before I pulled over. The overflow bottle was spraying like a fountain stream. But I popped the hood and it cooled down in like a minute.

My fan is shrouded but it is offset to only the hot side. Im hoping with the dual fan setup it will pull more air across everything. Another option is to run the fan setup I have now and keep these off to the side since I already have it wired for dual speed.

As MigGunslinger says: something might be up with the cap/pressure. Shouldn't boil at 220* unless there are serious hotspots (which wouldn't be surprising on an AMC360) and a 50/50 coolant mix at 14psi-ish:

That being said, still shouldn't creep like that at speed unless you're wooding it. Might be a couple of things:

1. Might have an airflow issue at speed where the airflow is stalling out due to excess pressure in the engine bay (common on wheeling rigs since the whole undercarriage is open). 60mph of air coming in is generally more airflow than fans can create anyway.

How blocked off is the front of the front of the radiator? When I had my winch relay in front of the radiator (as well as the winch), I added a small (3") sheetmetal air dam below the radiator near the back of the fans to create some low pressure behind the radiator for air to escape into. Helped a surprising amount.

2. How many RPM is that hunk-o-iron turning at speed? Oil temps rise a shitload with excess RPM, and water pumps can cavitate/collapse hoses.

 

[D_JEEPER]

I have a warn 9000hs out front and I suspect the ramped face is robbing me of directed airflow.

At 50-60mph, with my t176 and 4.56 gears, it is singing a little but not terrible. No tach installed, yet, but it doesnt sound like its 3500rpm or anything.
I definitely need to check the cap but it only opened when the temps hit that 230+ range. Probably a 30-40% mix of coolant or so...plus Purple Ice.

Airflow could be an issue but my fenders do not have inner fender wheel wells so it is pretty open to draft out.

 

[Rockwood]

I have a warn 9000hs out front and I suspect the ramped face is robbing me of directed airflow.

At 50-60mph, with my t176 and 4.56 gears, it is singing a little but not terrible. No tach installed, yet, but it doesnt sound like its 3500rpm or anything.
I definitely need to check the cap but it only opened when the temps hit that 230+ range. Probably a 30-40% mix of coolant or so...plus Purple Ice.

Airflow could be an issue but my fenders do not have inner fender wheel wells so it is pretty open to draft out.

Tires will pump air into the engine bay.

 

[chaplinfj60]

if its not too big a deal remove the winch and repeat the drive

just an idea