Eggering

Hey guys I recently had an issue with my xj running hot. Therefore I figured it was time to start replacing things. New radiator, flowcooler waterpump, 180 degree tstat, new hoses, new fan clutch, new tstat housing. Now the problem is (if it is a actual problem) is the noise. What I mean by that is usually when you start up the jeep and initially accelerate it makes that noise where it sounds like a tractor trailer or dump truck (sorry best way I can think of explaining it lol) and after driving a short while it goes away. Now since i replaced everything, it makes that noise 95% of the time. what should i check that i possibly messed up? 99 XJ Sport 4.0L. Thanks!

scottmphoto

That whine that you're hearing is probably the new fan clutch making the fan turn more.

djb383

Is the new fan clutch OE stock?

Eggering

Is that good or bad?

Eggering

OE Replacement (made by Crown)

djb383

I'm wondering if they gave u a thermal or non-thermal clutch? OE is a thermal clutch and should freewheel (quiet) after initial cold start/acceleration. Once it senses hot enough air off the rad, it should engage (roar) 'till things cool down, then it starts to freewheel again (quiet). A non-thermal clutch is basically engaged at low vehicle/motor speed and freewheels at high speed.

Do u have the receipt?.....get an exchange maybe?

Eggering

Well i searched the part number and it does come back to be a "thermal fan clutch". But you seem pretty spot on with the symptom, when im cruising i dont hear it but when im low speed or starting from stop it roars. hmmmm

djb383

Might want to verify coolant temp with a point-n-shoot infrared temp gun aimed at the t-stat cover. Factory temp gauge can be questionable. If it is running a little warm, that could be why the clutch is engaged (roar).