Help! Cooling problem. Bad waterpump?

[asp84]

My engine temp guage on my 94 4.0L stays below normal for about 3-5 minutes, and then dramatically jumps from cold to RM on Normal. When I turn My AIR Cond. on, the temp moves out of normal near the red zone. I have replaced my thermostat, and flushed the coolant system two times. Still no results.

What causes this dramatic jump from Cold to RM on Normal????

Is it my Waterpump, or Fan clutch? I have checked all fluid lines and Coolant level. All of my radiator hoses upper and lower are hot.

Thanks for your input
Al
asp84@earthlink.net

 

[Dbirl528]

Mine was doing the same thing until I replaced the fan clutch. Now mine won't even budge past the "O". Definitely replace yours if you have tried everything else.