This may sound like a stupid question, as I'm prone to ask sometimes. But...I drive a '96 Cherokee with the inline 4.0 non-interference engine and it doesn't like driving in the heat so much. Since I'm a car down right now I'm driving it a LOT more than I used to. After a lot of driving in this hot weather it starts slower, but still starts and runs ok.

So to help it out I've been raising the hood and putting 2 box fans right on top of the engine to help it cool. I hadn't thought about it but my Mom asked if cooling it down too quickly could be bad for the engine. And since I don't know I thought I'd ask here.

Any harm in using my method to cool an engine down much more quickly than normal?

 

You know that's a loaded question.

I doubt if it will cool as quickly as vehicles shut off when the temp is 0 degrees F.

As long as you are OK with the time to start , for now, until you get the other vehicle back in service , you might consider reading up on different causes for sluggish starts when hot. There are plenty of things to check, but always best to start with the basics.