2000 Mazda MPV Cap

Overheating is mainly due to lack of coolant in syatem. When removing the radiator cvap, was the coolant level correct?
Radiator cap must have a certain pressure to it to prevent coolant from leaking out of it.
If coolant level is correct, you would need to check the cooling fans.

Thanks For Your Reply About Radiator Cap. But My Problem Is I Can't Keep Water& Coolant In This Van. I Make Sure It Is At The Proper Level Before Driving But Before I Can Travel Ten Miles It Is Over Heating And The Water& Coolant Have Leaked Out. I Have Double Checked The Water Hoses And I Can Not Find Any Leaks. When I Have Replaced The Water&Collant To The Proper Level And Crank It Up And Just Let It Idle For Awhile, It Does Fine There Is No Water Are Coolant Lost And The Temp Is Normal, But When I Take It Out On The Road And Do Not Drive Over Fifty Five The Water& Coolant Will Be Lost And It Will Be Running Hot Again. Question Is What Goes With Water&Collant When Driving On Hwy And It Does Not Lose A Drop If It Sits And Idles All Day? This One Has Me !! Hope Ya'll Have An Idea. Thanks For Your Help! Odell R. Whitman.

Since you are having coolant losses issues. Overheating would definitely be there.

Is the recovery tank (coolant reservoir) depleting or overflowing? If it is overflowing, either you have a bad head gasket or radiator cap.

Did you try replacing the radiator cap?

If there are any leakages in the system a pressure test should let you know where the leak is coming from.

Thanks For Your Reply. I Will Replace The Cap And If I Still Have The Problem I Will Have It Pressure Tested. I Will Let Ya'll Know Later The Out Come. Thanks For Your Help! Odell R. Whitman.

You'rre welcome,

Have a nice day.