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THERMOSTAT

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1dodge1mopar
User

Dec 27, 2017, 6:03 PM

Post #1 of 3 (1344 views)
THERMOSTAT Sign In
I recently had problems with my battery. it showed an "FO1" code. I was able to get the truck started-2001 SILVERADO 5.3L 4X4/AUTO. I was going to take the battery over to WALMART & exchange it for another-this battery was 30 days under 5-yr. warranty. I let the truck idle to warm up for about 15 minutes & went out to leave. when I got in...the interior was "COLD". I immediately looked @ the TEMP guage. it was all the way over on "RED". I immediately shut it off. I loosened the overflow reservoir cap & noticed there was a LOT of "BACK PRESSURE". as I continued to loosen it...the pressure was so great that a lot of coolant escaped from under the cap-while still attached. I re-tightened it some. there was still a lot of "GURGLING" & coolant movement inside of the reservoir.

knowing auto engines as I do-worked on them-when I needed repairs/parts replaced-I determined it was a THERMOSTAT failure-causing the coolant to be PRESSURIZED "TO" the t-stat from the w-pump...with no CIRCULATION.
I will admit that the weather here @ the time was about 10*F & the coolant had a lot of water mixed in with it from the previous warm weather-small leak in the system somewhere. I honestly don't believe the coolant was jepordized with water as I did put in 100% antifreeze during the refill system periods. before I started the truck I did fill up the "RESERVOIR SYSTEM" with 100% coolant.
I did check the hoses-top...from the radiator...& bottom...from the thermostat & heater hoses. they were all "WARM" & "SPONGY".
IS MY "ASSUMPTION" that the t-stat is the problem here???
THANX


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 27, 2017, 6:16 PM

Post #2 of 3 (1336 views)
Re: THERMOSTAT Sign In
Quote
knowing auto engines as I do-worked on them-when I needed repairs/parts replaced-I determined it was a THERMOSTAT failure-causing the coolant to be PRESSURIZED "TO" the t-stat from the w-pump...with no CIRCULATION.
Not even close.

Your system was low on coolant and full of air pockets because you likely have a leak somewhere. The pressure was created when the coolant that was left started to boil because there wasn't enough in it to cool the engine.

What you need to do now is get the truck indoors and totally thawed out and refilled with coolant and then pressure test the system to find the leak.



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Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Dec 28, 2017, 4:17 AM

Post #3 of 3 (1291 views)
Re: THERMOSTAT Sign In
You knew it was leaking and YOU SAID "A lot of water" in it! NO. Leak from warmer times still add a mix so this doesn't happen you may have cracked this engine? That happens when protection level now you can't measure is below about +20F or so. Above that the weak mix expands below that it's still frozen but doesn't expand but can't flow now this level of overheat the problems from too much water if near total you've harmed the engine long ago now made it worse.
About everything must hold pressure or will boil over seen or not. Just FYI each pound of pressure increases boiling point by 3F such that plain water under 15lbs wouldn't boil till 257F @ sea level. The mix only adds a few degrees to boiling points. Problem is air/vapor doesn't exchange heat then damages occur now paying for that,


T
(BTW - In NE USA about 1/3rd of country in this cold isn't' getting warmer day or night's temps for another week or so learn to deal with it)






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