I have a 1997 Montero ls that has me stuck . When I start my truck it can idle for an hour with no problem but when i put it in drive and step on the gas it over heats , when it gets hot i only need put it into park and it cools down until i put it in drive again . Anyone have a clue what this could be caused from ?

 

when you put in drive how long do you sit parked before it over heats ??? have you tried to drive it when you put it in drive ??? how many miles on the truck ??? what have you checked ??? what have you done to fix the problem ??? what lead to this problem ??? how long have you had this problem ???

 

The truck has 92k miles on it, As long as i don't drive it away it can idle for an hour and does not overheat.When i drive it it overheats within 3 miles. I have drained the radiator and put fresh antifreeze in it but it still overheats when I drive it.I bought a new thermostat and will install it today .The problem just started a week ago, was fine and the next minute it started to get hot .In fact when driving and the temp gauge goes to max I only need pull over-put truck in park and the gauge goes back down to normal until I drive again.Strange I know .

 

Have you checked the temp. gauge?
It could be sending you bad data.
If replacing the thermostat does not solve your issue, that may be something to look at...

 

sounds like gearbox oil cooler is sh*t.