new problem this morning...
Thread Starter
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Senior User
Joined: Mar 2009
Posts: 294
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From: metro detroit area...
new problem this morning...
I was driving to work... and everything was great. when i got off the highway, my temp guage went from straight up like it always is... to just above the low limit for normal range and it stayed there for about ten or fifteen minutes. then I shut it off. Driving home it warmed up, but only to the low limit line for normal range... then it eventually went up to about 1/4 the way through normal range, never back up to half though. The heat works fine, no noticeable difference, no coolant smell anywhere, the fluid level is exactly where its supposed to be, no leaks, no nothing... was thinking either the thermostat is bad or the sending unit went bad but i'm not sure. Any ideas???
Fleet Mechanic
Joined: Feb 2009
Posts: 1,672
Likes: 20
From: Nixa
Thermostats are designed to stay open when they go bad. It prevents the engine from over heating. When they stay open the coolant continuosly circulates, collecting all the heat as is goes through the engine and on through the radiator. So the engine is alway cool. The guage would always read cool. If the thermostat was stuck closed, the coolant wouldn't circulate, it would stay in the block and boil, thus over heating the engine.
Cargo Master
Joined: Sep 2004
Posts: 2,690
Likes: 6
They why do parts stores sell two types? The last two times I bought a tstat I was offered the option of normal one or the one that will stay open if it goes bad (which costs more by the way.)
Thread Starter
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Senior User
Joined: Mar 2009
Posts: 294
Likes: 0
From: metro detroit area...
never heard of that before but i know it doesn't always happen that way, had one go bad on my first car and it stuck shut and i almost blew it up... just like anything else, only works when it wants and not when you really need it to
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Posting Guru
Joined: Dec 2006
Posts: 1,639
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i guess all the motors i have built have been performance motors so that might have something to do with that
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Senior User
Joined: Jan 2009
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From: Maricopa, AZ
I lucked out that I didn't damage anything except the o-rings on the temperature sender, coolant temp sensor, and the thermostat housing where it mounts to the head. Those were baked pretty good.
Last edited by Beastly; Mar 11, 2009 at 06:19 PM. Reason: not last summer... Time flies.