QuestionI have a 94 ford explorer 6 cylinder with a/c.....I had recently overheated and had to change the thermostat. My problem is it seems to still want to run hot...especially in a city environment...highway no problem. there are no leaks and it has not been loosing any water as far as I can tell, the engine runs fine with no odd noises, I do not believe the problem to be the waterpump as there is no leak or noise...what else could the problem be?
AnswerHello Mike,
The two most likely causes of your stop-and-go overheating problem are the fan clutch, and the radiator.
The best way to check the fan clutch is,with the engine off, take the two screws out of the fan shroud and push it toward the engine slightly. Look at the front hub of the fan clutch where the spring is. If there is fluid residue with dirt all over it , replace it, with a severe duty unit if in a hot climate, regular duty in a colder climate. When enough fluid leaks out, the clutch will freewheel too much and not flow enough air.
If there is scaly buildup inside the radiator tank at the tubes that go across the radiator, then it is a likely cause of your problem also. The hard water scale etc. that builds up drops the heat dropping capability of the radiator, and when it gets bad enough, will cause a heating problem, specially on that design because of the lack of a large surface area on the core. A larger, thicker radiator is available from many sources, without really needing any parts modification.
Check those things first, and good luck. I'm sorry I took so long, I was having computer troubles. Shaun.
