Fan Shroud
 

i have a I6 250 recently rebuilt as some may know but have had trouble keeping it cool
i found information that putting a fan shroud to direct more air would help is this true if so which fan shroud would fit best:gmc2::devil:

Re: Fan Shroud
 

You shouldn't have trouble keeping a 250 cool, mine runs 195 degrees while pushin 3,500 rpm

Re: Fan Shroud
 

It depends. Do you do a lot of stop and go driving? With or without loads? Driving around at 3500rpm suggests a lot of high speed driving. What's the ambient temp?

A fan shroud will help if you drive below 45 MPH or stop for traffic lights, or experience traffic.

Shrouds are important, and I'm seeing a common thread developing here.

Re: Fan Shroud
 

These trucks with 250's did not come with a shroud, just a flat plate over the fan to protect you a little. Unless you build a high HP 250, a shroud may make you feel better, but not needed.

The V8's all got factory shouds I believe. If I really wanted a shroud, I would start there.

Re: Fan Shroud
 

I have a 250 in mine and I also used to have a heating problem after I rebuilt it.
There were no head gasket leaks or other problems with the engine that would cause it to run hot.

Things I did on mine:

I bought a temp indicator cap at Auto Zone to make sure it was running hot and not the gauge being wrong.

Then I checked all of the hoses and they were all good.

Made sure the t-stat was working properly. Tested it in a pot of water with a cooking thermometer and checked that it opened up at the stated temp. It did.

Experimented with percentage of anti freeze to water. No help.
Replaced the radiator cap with the recommended one. No help.
Replaced the water pump. No help.
Had the radiator rodded. No help.
Installed a double core radiator. No help.

As a last resort, I installed an overflow container to prevent fluid loss and that finally fixed it. Temp stays at the normal level even idling in the hot days.

Not saying it will fix yours, but it's a cheap way to find out and/or prevent fluid loss.