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Old 05-09-2019, 09:23 AM
Causey842 Causey842 is offline
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Join Date: Dec 2011
Posts: 79
Default Engine Temperature question

Hi Everyone,

I have a 02 3.0L with 120K. I have owned the truck roughly 8 years and never noticed if this was abnormal from the coolant temp. On a cold start after driving a little bit I notice the temperature goes up a little above the half way marker for 2-5 sec then back down to where it normally sits a little below the halfway mark. Coolant is full and I have both cold and hot air.

My question does this seem normal? Maybe the 2-5 sec spike is the thermostat opening? Did I just never notice this before, or is it indicating a potential issue?

Thanks!
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Old 05-09-2019, 10:08 AM
crowdpleazer crowdpleazer is offline
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Default Re: Engine Temperature question

I think your thermostat is sticking closed and then opening late. I'd change it before it stays stuck closed and overheats your engine.
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Old 05-09-2019, 10:16 AM
Causey842 Causey842 is offline
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Default Re: Engine Temperature question

That is what I was thinking. For all I know it is the original on the truck, I bought it at 68K. I just thought it was odd behavior for the thermostat, in my past experience they just seemed to up and quit. Should I just assume that and replace the thermostat, or anything else I should look for ?

Thanks!
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Old 05-09-2019, 10:56 AM
DocModisett DocModisett is offline
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Default Re: Engine Temperature question

What you are describing is entirely normal,,, you just haven't noticed it before... the thermostat warms up the engine, pops open some ,, the engine takes a gulp of cold water and the thermostat closes off again until the temp comes up enough to make the thermostat open again....
there is a little mod that you can do that will change that behavior... drill a small hole in the flange of the thermostat that will bleed the warm water into the cold side... this eliminates the hot/cold shock that cracks the plastic end tanks... warm up will be a little slower but the benefits are worth it.... Doc,,,, " Widely unknown "
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Last edited by DocModisett; 05-09-2019 at 11:02 AM.
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Old 05-09-2019, 11:04 AM
Causey842 Causey842 is offline
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Default Re: Engine Temperature question

Interesting. Yes by no means is it overheating, I just cannot believe in the 8 years of owning the truck I never noticed it move like that. It is definately a 2-5 second above normal temp before going right back to where it is supposed to be. All of my other vehicles never do this, they climb up to regular operating temp and stay there. hmmm
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