Sticking Thermostat?

[LeeLee D]

Hey guys, new problem that has been appearing random at most.

Sometimes of colder nights driving to work, my temperature guage starts going higher than normal while pressing on the gas. When I let off the gas it goes back down to normal. While idling it doesnt rise, but when i press the gas it goes up, off the gas it stops. If I turn my car off then back on it goes back to normal and doesnt heat up anymore.

My best guesses are either a stuck thermostat or maybe a bubble in the coolant? Overflow is at normal and there isnt coolant in my oil, so I doubting headgasket.

Im only at 130,000 Km, and recently had the timing belt, water pump and seals replaced. What are your thoughts?

It happened only once this week and once last week. The block itself didnt feel overly hot so it wasnt extreme overheating.

[STZYGT]

Yo,

yeah thats kinda one of those things i would really like to see happen so i would have a more accurate idea of whats happening. Here are my thougts. I have a problem with my GT that when i am under heavy load up moutain hills for long periods of time my car runs to hot.. not over heats, just to hot. I did a coolent flush and replaced the t-stat. Problem not solved. I have been through the head gasket issue and i know thats not the problem. My best guess now is a glogged radiator that just doesnt have the cooling capacity. This doesnt sounds like your issue. Head gaskets on the 2.5 dont leak into the block. They leak compressed gasses into the cooling system. this to me sounds like the most possible cause. Sticking t-stat isnt im plausible. I would recomend replacing your t-stat and coolent unless it is still good. Remeber run a 50/50 mix water has a better cooling ability then coolent. Also get some of BG's coolent conditioner. It breaks the surface tension of the liquid to make it conform to imperfections in the system. Ha ha well i have gone on long enough. but start cheep and work your way up. remeber that these engines usualy blow gaskets at your millage.

[Sub~yota~tech]

Hey,
you could do a simple resistance check of the temp sensor thats located on the top left side, under the intake manifold.
The spec at (cold start)68 degrees should had a reading of 2.5K ohms and it goes way down as the engine gets warmer.
You can back probe the sensor and attach some clamps from your DMM probes to the probes*that are inside the connector*
and start the car and let it warm up. As the engine warms up
you should see the resistance on your DMM drop. Make sure you select the correct range when testing.

heres a link to a diagram. i hope it helps you

http://alldatapro.com/alldata/PRO~V4656 ... 0/86363068 (http://alldatapro.com/alldata/PRO~V46563787~C34653~R0~OB0~P2R0H~N/0/77993956/78884323/78884354/78884356/34853741/92093625/100409253/100409254/56192838/14585321/103121190/86363068)

[SHOfast]

When you say "pressing on the gas" how long are you pressing on it before you see the temperature go up? Like by the time you go from 0-45mph or like a mile long uphill climb?