Starting to think my Tstat is stuck open....... - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-11-2003, 12:46 PM Thread Starter
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Starting to think my Tstat is stuck open.......

the past couple three days, I've noticed that my Temp doesn't seem to get over 140... just now on my way back from Lunch it hit a high spot of about 120..... all this according to the guage. i have a Mechanical guage, that has always given me a fairly accurate Temp in the past, and now I'm trying to determine if the guage is screwing up or the Tstat is stuck open. I checked the Capilary tube for the Guage and there are no kinks or any seemingly wrong with it.

Anyone got any tips to determine if I'm right before drainng the system down enough to pull the T-stat?

thanks
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post #2 of (permalink) Old 09-11-2003, 01:26 PM
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Re: Starting to think my Tstat is stuck open.......

You could put some cardboard in front of the radiator, and see if the guage read any higher. You would be taking a chance of overheating if it was a bad guage though.

I would just pull the t-stat. I don't rememmber it being an issue of draining much down, it just kinda makes a little mess in the drive way.
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post #3 of (permalink) Old 09-11-2003, 02:02 PM Thread Starter
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Re: Starting to think my Tstat is stuck open.......

Ya, i know, but I'm just trying to make sure before I bother draining.... [img]images/graemlins/tongue.gif[/img] being Lazy... [img]images/graemlins/crazy.gif[/img]
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post #4 of (permalink) Old 09-11-2003, 03:21 PM
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Re: Starting to think my Tstat is stuck open.......

How about just popping the radiator cap and inserting a thermometer? Then compare the reading to the dash gauge. I never understood why they put calibration marks on a temp gauge anyway. They are seldom that accurate.
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post #5 of (permalink) Old 09-11-2003, 03:55 PM Thread Starter
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Re: Starting to think my Tstat is stuck open.......

Well, just in case the guage was wrong, I wasn't too keen on hot coolant spaying on me... [img]images/graemlins/tongue.gif[/img]
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post #6 of (permalink) Old 09-11-2003, 05:06 PM
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Re: Starting to think my Tstat is stuck open.......

Well, if the temp is actually up around the 200* point, a few drops of fresh water on the top tank will evaporate almost immediately. If it's only 120* it will sit there quite a while.
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post #7 of (permalink) Old 09-11-2003, 05:53 PM
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Re: Starting to think my Tstat is stuck open.......

I didn't realize I had to give step by step instruction. Try starting with the engine cool and check the temp as it rises.
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post #8 of (permalink) Old 09-12-2003, 08:08 AM Thread Starter
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Re: Starting to think my Tstat is stuck open.......

how about instead I fire it up cold, pull the cap off and spit in the radiator and watch it flow out of site? That's what I did yesterday before heading home from work.....
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post #9 of (permalink) Old 09-12-2003, 08:24 AM
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Re: Starting to think my Tstat is stuck open.......

</font><blockquote><font class="small">In reply to:</font><hr />
Try starting with the engine cool and check the temp as it rises.

[/ QUOTE ]

Is the water in the radiator the same temp. as the water in the engine?
Doesn't the engine water get to 195f or so and then start to mix w/ cold water in the radiator? Using only what it needs to stay at 195f and immediately recooling the radiator water?
How is that test going to work?
Give me the step by step if you would please (I ain't too smart).
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post #10 of (permalink) Old 09-12-2003, 10:35 AM
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Re: Starting to think my Tstat is stuck open......

Let me simplify this for you and Aaron.... If it is too hot it will boil over... If it is too cold the engine block will crack and you will know you should have added anti-freeze... Who needs a guage anyways.....

With my luck the thermostat always sticks closed... I took the thermostat out of my wife's 91 xj 4.0 and it ran about 140 max... Doesn't really matter until winter... I don't think a thermometer will work in the radiator you need a reading off the coolant in the engine.. I hooked a coolant sensor in a radiator hose one time and later hooked one up in the block on my 4.3 and they varied by about 15-20 degrees.
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