Question about 2000 Ford Ranger SuperCab

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Temperature gauge cold then back to normal

When i start my truck in the morning gauge will heat almost to normal then i start driving and it will drop down to cold and i lose my heat then it rises back to normal and heat comes back ive replaced themostat,radiator,water pump,collant temp sensor,coolant temp switch and still having problems ive also disconnected battery to reset the computer while replacing sensors

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  • Ford Master
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You have to make sure the thermostat is working properly and is the correct one. Idle the vehicle for about 20 minutes and then feel the upper radiator hose. It should be hot to the touch. Drive the vehicle and when the temp gauge falls to 'cold' stop and feel it again. If it is much cooler to the touch than before the thermostat is defective or wrong.

Posted on Mar 23, 2014

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Dash Temp Gauge reading extremely hot

I had an issue with my 95 taurus and we ended up having to replace the thermometer

Posted on Mar 05, 2009

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SOURCE: Overheating problem

With the sensor unplugged and the fan works,, replace the new sensor,,,,, it is probably defective. I have seeh this before.

Posted on Jul 28, 2009

Molson02536
  • 3854 Answers

SOURCE: temperature gauge goes up all of the sudden

It sounds like you have air in the Cooling system and the bars leak permanent seal does not help. The sealer creates restrictions through out the water jackets and can cause the thermostat to stick. Replace the radiator cap and run the truck with the radiator cap on the first click and keep an eye on the over flow tank, refill the over flow as needed and make sure you have the heater on the highest setting to work out all the air in the system. Once all the air has worked it's way out of the system, then you can close the radiator cap to the second click to ensure full pressure is built up in your cooling system. Good luck and keep me posted.

Posted on Dec 09, 2009

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localwonder
  • 6784 Answers

SOURCE: 1995 ford ranger with 4.0 auto, I have very

Hi. There are several ways to test the opening temperature of a thermostat. Use this procedure to confirm that you are running the correct rated thermostat.

One method does not require that the thermostat be removed from the engine.

* Remove the radiator pressure cap from a cool radiator and insert a thermometer into the coolant.
* Start the engine and let it warm up. Watch the thermometer and the surface of the coolant.
* When the coolant begins to flow, this indicates the thermostat has started to open.
* The reading on the thermometer indicates the opening temperature of the thermostat.
* If the engine is cold and coolant circulates, this indicates the thermostat is stuck open and must be replaced.

The other way to test a thermostat is to remove it.


* Suspend the thermostat completely submerged in a small container of water so it does not touch the bottom.
* Place a thermometer in the water so it does not touch the container and only measures water temperature.
* Heat the water.
* When the thermostat valve barely begins to open, read the thermometer. This is the opening temperature of this particular thermostat.
* If the valve stays open after the thermostat is removed from the water, the thermostat is defective and must be replaced.
* Several types of commercial testers are available. When using such a tester, be sure to follow the manufacturer's instructions.
* Markings on the thermostat normally indicate which end should face toward the radiator. Regardless of the markings, the sensored end must always be installed toward the engine.
* When replacing the thermostat, also replace the gasket that seals the thermostat in place and is positioned between the water outlet casting and the engine block.
* Generally, these gaskets are made of a composition fiber material and are die-cut to match the thermostat opening and mounting bolt configuration of the water outlet.
* Thermostat gaskets generally come with or without an adhesive backing. The adhesive backing of gaskets holds the thermostat securely centered in the mounting flange, leaving both hands of the technician free to align and bolt the thermostat securely in place.

Posted on Dec 22, 2009

  • 27 Answers

SOURCE: After Draining cooling system on

Hi... Be sure to put your heater controls to hot when you bleed the engine coolant, run the engine up to normal running temp and top up as neccessary... you may have an air lock in the heater matrix. Please let me know how you get on....

Posted on Oct 07, 2010

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