Over Heating issue 2000 Jeep Cherokee

Good day All,


These last couple of weeks, i have been fortunate enough to have my Fathers Cherokee while my BMW is under the knife, but ive been experiencing some issues with the radiator and heating system.

While driving, a hear a loud "whistle" type noise when i release the gas pedal and only cold air comes out of the fan. The temp gauge climbs and descends very little but enough to say its not steady... 2-3 mins of highway driving, then BAM... Check Gauges - Temp overheating. So, i pull over... wait 2 min and start it up and everything works fine... :dunno:

I noticed it deosnt do it all the time & only when i have the Windshield defrost on. There is a sufficient amount or prestone in the truck, so i figure thats not the problem.

Anyone have a suggestions as to what it can be?
I seek the advice of the wise on this one.

Thanks in advance,
Bacci

electrical problem:dunno: you'd have to scan the truck to see if the sensors are working right, but theres no check engine light? Maybe an intermittent problem? My first thought was the heater core but it makes no sense to be back to normal after you restart.

Your first step should be to scan it. IMO

rad fan, with the defrost on it cycles the ac and when the ac is on the rad fan malfunctions, i'v heard of this on a 98 cherokee before. have the fans checked.