Re: My engine runs hot sometimes, I think it is the...
If you follow one of your main (thickest) hoses usually from the top of your radiator, to the top of your water pump it should go from rubber to a metal housing and two to three bolts holding it down. Remove the bolts and the thermostat should be right inside the metal housing. Use a flat head screwdriver to pop the thermostat out and apply some high temp. silicone install new one and your done.
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make sure engine coolant level not low.to replace thermostat on the V6 engines you need to raise the front of the vechicle support on jack stands remove splash shield from below engine.you need to drain coolant from radiator.you have to place radiator support panel in service position then follow the lower radiator hose to engine to the thermostat housing.
Thermostat may be installed upside down...this can cause overheat.
To test your engine...if you don't think thermostat is faulty, remove the thermostat.
This is sometimes called "running cold"...and it should not overheat. If it does, you have bigger problem than thermostat.
You can test thermostat too by placing it in hot water thats not quite boiling and see if its opening properly.
if you replaced the thermostat, you have an air bubble trapped in the engine. So, you don't have any coolant running through the heater core, therefore no heat.
sometimes hard to "burp" air bubble. Try this. Park park facing uphill and jack up front of car too. You want to get radiator opening higher than top of engine. Then remvoe radiator cap (cold engine), fill radiator, then fill coolant reservoir to full point. Install radiator cap but leave it loose so air can escape. Start engine until upper radiator hose going into radiator is hot. This should burp air. Repeat a few times while adding coolant mix (50/50 antifreeze) to keep radiator full. Be careful not to remove radiator cap when engine is hot.
lwt us know how ou make out. There is a more complicated procedure but you need tools and knowledge of where air bleed is on top of engine