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Man, I'm having the same problem. One day, out of the blue, the temp guage started Fluctuating. I've done everything I can think of: Fan and Clutch New Radiator All New Hoses New T-stat (done this twice) New Radiator Cap New Temp Sending unit (for the guage) New Water-Pump (today)...

Haven't changed the heater core. I didn't think it could be related. I still does it with the heater on or off. I did change the rad cap, but with a cheap Stant. Maybe I'll run by Ford and get a factory replacement. Also, I'm going for a flush next week, probably. I guess we'll see...

Well, I fixed my other problem, and the two weren't related. Had a fouled and bridged plug. I went to a ford dealership and got a Motorcraft Termostat, 3x the price of the Stant. Still doing the same thing! Could it be the water pump? It's the only thing I haven't replaced...

HA! 2 fouled plugs, one of which was bridged. New plugs and wires and she runs like a dream... Still has the weird problem with cooling though...

Thanks for the posts guys. I'll try another Thermostat, because I have no other clue. Also, I've tried to burp the sustem. I have a steep driveway, so I parked it, took off the cap and let it run until coolant started coming out. Is that right? There were a few bubbles, and I just topped it...

This may or may not be related to my other problem posted in the forum Dead Link Removed. I didn't post them together, as it would be really long. Right after the other problem started and we replaced a few parts, the truck started running sluggishly. The engine idles rough and kinda lopes...

OK, here it goes... '93 Explorer XLT - 4.0L V6 2WD - 220K Miles The temperature normaly sits on the 'N' on the 'NORMAL' of the guage, even during the hot Oklahoma summers. Last week it started moving up to the 'A' and then back down to the 'N' over and over again as I was driving. I knew...