Weird overheating
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New User
Joined: Sep 2000
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Weird overheating
I have a '93 Ranger which I replace the fan clutch with an electric fan and an 180deg. sensor. I also replace the old thermostat with 180 deg as well as replacing the water pump.
Now I am experiencing an overheating problem. I will get onto the freeway and it will be operating at a normal temp even at speeds of 75-80mph. Then when I exit the freeway and come to a stop it gets heats up rapidly. Then when I continue driving it steadily heats up(Very hot). But if I pull over and let it idle it cools down. This makes no sense to me. I have also flushed the radiator twice in hopes that it would solve the problem.
Could someone please shed some light on this weird behavior.
Now I am experiencing an overheating problem. I will get onto the freeway and it will be operating at a normal temp even at speeds of 75-80mph. Then when I exit the freeway and come to a stop it gets heats up rapidly. Then when I continue driving it steadily heats up(Very hot). But if I pull over and let it idle it cools down. This makes no sense to me. I have also flushed the radiator twice in hopes that it would solve the problem.
Could someone please shed some light on this weird behavior.
Posting Guru
Joined: Aug 2000
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Weird overheating
Clint, since it cools normal at 80mph, got to be an airflow problem. Is the fan shroud flush with radiator and even with the tips of fan blades? This is very important. Other than that, check to make sure thermostat is really turning fan on at correct temp. Hope this helps. Don
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
"Nothing lasts forever except natural stone and old Ford trucks." (Willie Nelson)
Elder User
Joined: Jun 1999
Posts: 861
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From: SE PA
Weird overheating
Are you getting airflow over the sensor that might be "foolin'" it? Silly question, is the t-stat in the correct way and not backwards. Sorry, even though I don't think so, had to ask! Is the fan a reversable, and if so, is it turning the correct way so the airflow is through the radiator and not pushing against the incoming airflow. With some all you have to do to make a puller into a pusher is switch the motor leads, easy enough to do by mistake! If I think of anything else that might help, I'll post!
Postmaster
Joined: Jul 1999
Posts: 3,172
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Weird overheating
Part of the problem may be the 180 thermostat , that engine is designed to run with a higher temp thermostat . Where is the fan sensor mounted ? Is it sensing air temp or coolant temp ? With the lower temp thermostat you are confusing how the computer adjusts the mixture . Lower temp , richer mixture ; the O2 sensor may be leaning the mixture to the point of causing a hotter running engine ? Ive heard tell of aftermarket fans that run sensors mounted on the upper rad hose ...Is this the case with your setup ? If it is either the sensor isnt recieving the correct temp info due to the airflow or the sensor has failed . Just my opinion , but I think youd be better off with the original fan clutch setup Vs what you have .
Senior User
Joined: Jun 2000
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From: CANADA
Weird overheating
I had the same problem with my 92 4.0 litre in my Explorer. I put in a 180 degree F. T-stat, and it started overheating. I put in a new 190 degree F. T-stat. and my problems were fixed. What happened was the thermostat opened too early, and stayed open because of the high temperature operation of the 4.0 litre engine. therefore not allowing the coolant to stay in the radiator long enough to cool down. The engine was just cycling hot coolant through the whole system without allowing it to stop in the radiator. Change your thermostat back to what the factory specifications are and you will be fine. I am sure of it. Also check to see if your rad is plugged with debris.
Hoppy,
92 Explorer Sport
4x4 4.0 Litre.
Hoppy,
92 Explorer Sport
4x4 4.0 Litre.
