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You mentioned your vehicle is a 1994, but the following information might be helpful. If anything, just to know that there are know problems with temperature fluctuations for this engine. This would also seem to support my former theory on how the volume of flow through the heater hoses could...

Just replaced radiator and bypassed heater core. Same consistent temperature gauge fluctuation. 93 Limited 4.0, no heater control valve. Looks like I am going to try my third 190 degree, not the factory 195 degree, motor witch craft thermostat. It has a 1 year free replacement. Already...

Buy a copper Heater Core from Napa.

Use the lower intake gasket made by Fel-Pro.

Explorer Craziness?:eek:Crazy like a fox!:confused:

Al, if you have made any progress in getting your engine to idle better, please make a post. I recently bought a 93 with a 4.0 ohv, and I have to agree, the idle has been driving me crazy. Before I started reading these forums, I had performed a lot of needless maintenance. My engine does...