What daytime temp. is it safe to use radiator block to?

 

There may not be one "correct" answer for "everyone". Variable conditions can greatly influence this: going up a six mile hill to the ski resort at 40F will cause an increase in engine and coolant temperature. Going down this hill at 40F will unlikely cause this to occur. That said, 40F is a point where I consider opening some of my radiator block. The scanguage or similiar can provide needed information related to this question.

 

thanks, expecting 50 or so so I guess out it comes, Thanks

 

I think 50 is a safe number.

If I'm driving in city conditions, with lots of EV time ( which is cool down time ) I have been OK at 60 degrees outside air.

50 degrees is a good cut-off point if you are driving under high load conditions. A hill for example, or even flat at over 65 MPH is high load.

 

I installed a radiator block (home made) and have not taken it off since '08. I have an '07. I live in Chicago and drive highway and street. No issues year around.

 

Another benefit I just realized....

It warms the intake air temperature by another 5-10 degrees over ambient.
This is better for MPG.

 

Is intake air pulled through your radiator? I think not.

 

"Look before you leap."

In other words, go take a look under your hood before posting stupid remarks.