On the Jan 18, 2014 show, a man called in to complain that his Explorer’s heater wasn’t working well during the recent winter storm. I believe it was Ray who knew the answer before the caller finished his question. Just based on the facts that he had an 93 Explorer and a problem related to cold weather, Ray called it as a bad thermostat. He went on to say that there had been a flurry of thermostat replacements for Explorers in his shop. I’m sure that this is also true for Ford Rangers with the same 4-liter V6 “Cologne” engine.
So the solution offered was to replace the thermostat. But is that really the solution? Why do thermostats continually fail in these engines? Is there a replacement part that isn’t susceptible to this problem?
I’ve owned my 94 Ford Ranger Splash since it was brand new. I don’t know how many thermostats I’ve put into that engine, but it’s a big number. The last few have failed within months, or even weeks after installation. Even when the truck was fairly new and still under warranty, the dealer had to replace the thermostat on the first time it failed. I’ve got more than 300,000 miles on the original engine, and now I need to put in another new thermostat (and a heater core).