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Posted on Jan 02, 2017
SOURCE: Intermitant temperature
Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.
Posted on Jan 20, 2009
dear friend-there is a couple of things you can do to find the problem,when the engine is cold remove the radiator cap start the engine then look inside to see if the water is circulating,all so look for bubbles in the water,if there is bubbles,you might have a blown head gasket,if there is circulation the water pump is ok,then get the engine up to working temp,then feel both the top and bottom radiator they should be the same temp,if not then the termostat is at fault
Posted on Nov 04, 2009
If the fans are electric, then replace the fan control module.
If the fan is belt driven, replace the fan clutch.
There is a chance that the thermostat is failing, but if the temperature fluctyation occurs during driving, as opposed to stopped and idling, then it's probably the fans.
Posted on Dec 18, 2009
if the truck its self is overheating 9 times out of 10 it it the theromastate unless the heater hose to the heater core is stoped to find the theromstate follow the upper radiator hose from the radiator to the top of the engine and its right there at the end of the hose under the thermostat housing.
Posted on Dec 23, 2010
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