Tip & How-To about 2002 Ford Ranger Regular Cab

2001 - 2003 ford Ranger 2.3 L, ALSO -ford focus 2005 -2010 2.0 L, ALSO - Mazda B2300 2.3 L

The thermostat is electrically opened by the computer, there are two coolant temp sensors, one is to the gauge the other is cylinder head temp that the computer reads to know when to open the thermostat, when you place the thermostat in water to test, it won't open enough (fail safe only)

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Replaced head gaskets on pontiac trans am 1997 lt1 eng now its over heating


trapped air. When temp needle climbs to 1/4 way, loosen coolant temp sensor to bleed off trapped air in cylinder heads. Air is gone once coolant starts to stream out, but only open slightly at a time. May have to do in increments as trapped air will cause rapid overheat

Jul 03, 2015 | Pontiac Cars & Trucks

1 Answer

'05 Grand Am 3.4 V6 Temp Gauge not Working all of a sudden.


Sounds like a temp sensor or wiring problem.
You may only have one sensor for both the gauge and the engine computer.
If the computer temp sensor fails, or is not sending a signal to the engine computer, the fans will run as a precaution to keep the engine from overheating.
If you have replaced the correct sensor, it could be a wiring problem, or the engine coolant could be low enough to not touch the sensor.
If the coolant sensor is not sending a signal, the check engine light should also be on.

Apr 07, 2015 | Cars & Trucks

1 Answer

cause no heat temp gauge red lined in


sounds like the thermostat is stuck shut..unless the head gasket is blown somewhere.. it will pump the antifreeze level down to form an air pocket.. this will cause overheating constantly check each cylinder for even compression..the lowest reading will most likely be the blown cylinder..

Dec 15, 2013 | BMW Cars & Trucks

2 Answers

2003 mountaineer V8 Temp gauge jumps to hot not over heating. Replaced thermostat, no change


The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.

Jan 06, 2013 | 2003 Mercury Mountaineer

1 Answer

I have a 2004 Ford Explorer Sports Trac. The Check Engine light came on. My Mechanic's Reader says "Low Coolant Temp." We shut off the light. I came on again. Both times, only when driving more than 10 miles with speeds above 55 mph. We replaced the thermastat and coolant. It came on again this saturday on the way to South Dakota. The Temp. Gauge barely gets to operational temp/slightly above in city, and falls at/or below operational temp when stopped. Please help!


The first step is to determine whether the engine is actually running cold or if the engine computer just "thinks" it is. Your temperature gauge is controlled by the engine computer. I use an infrared thermometer directed at the base of the Engine Coolant Temp (ECT) sensor while watching the ECT sensor data on the computer to see if they match. This should be done before replacing ANY parts. You need to make sure that the ECT is not "lying" to your engine computer. Your vehicle is also equipped with a Cylinder Head Temperature (CHT) sensor to measure the the temperature at the cylinder head. (The ECT is located in the intake manifold.) These should read within 5 or 6 degrees from each other at all times. If it is determined that the sensors are all functioning properly, and the engine actually is running cold, then I would recommend getting a thermostat from the dealer. (I have had a few problems with aftermarket thermostats.)

Nov 23, 2010 | 2004 Ford Explorer Sport Trac

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