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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
To alleviate some of the arguing, here is what Stant recommends.......
How do you test a thermostat?
A thermostat can be tested by threading a string through the valve and suspending it in a bucket of boiling 50/50 coolant and water. Immerse the thermostat in the hot/boiling coolant mixture for a few minutes; if the thermostat is working, it will fall off the string as it starts to open. Remove the thermostat. After allowing it to cool, the thermostat should close.
.........from their website so there is your answer.
Boiling water works just as well. Don't reach in the bucket to retrieve it.
To alleviate some of the arguing, here is what Stant recommends.......
How do you test a thermostat?
A thermostat can be tested by threading a string through the valve and suspending it in a bucket of boiling 50/50 coolant and water. Immerse the thermostat in the hot/boiling coolant mixture for a few minutes; if the thermostat is working, it will fall off the string as it starts to open. Remove the thermostat. After allowing it to cool, the thermostat should close.
.........from their website so there is your answer.
I'd would rather know WHEN (at what temp) the stat is opening, how SMOOTHLY it opens, that it OPENS FULLY and that it CLOSES COMPLETELY. If it opens say, a 1/32"?, it will drop from the string but 1/32" is far from opening enough to allow full coolant flow to the rad.
Stant makes millions of thermostats for just about all cars and trucks made. Are you arguing that you know thermostats better than them? Your 7000 some-odd posts aren't worth all that.
..and since the stat isn't fully open until 15-20 degrees over the rated temp, one would have to bring the water to a full boil to get a 195' rated stat to be fully opened.
What were you saying about boiling water being bad for a thermostat?
..and since the stat isn't fully open until 15-20 degrees over the rated temp, one would have to bring the water to a full boil to get a 195' rated stat to be fully opened.
What were you saying about boiling water being bad for a thermostat?
Learn and move on....
Sure glad u r here now with your 200+ posts of wisdom saying things like "the stat is in the block". A heavy discount factor will follow your future posts.
Did I ever say boiling water is bad for or will damage a stat?....I think u (and others) said that.......I said a stat is NOT exposed to boiling coolant inside the motor. Even a 195 stat can be adequately tested without boiling water.
Sure glad u r here now with your 200+ posts of wisdom saying things like "the stat is in the block". A heavy discount factor will follow your future posts.
My professional mechanic experience was making helicopters for Boeing. They didn't have blocks. They had turbines.
I'd would rather know WHEN (at what temp) the stat is opening, how SMOOTHLY it opens, that it OPENS FULLY and that it CLOSES COMPLETELY. If it opens say, a 1/32"?, it will drop from the string but 1/32" is far from opening enough to allow full coolant flow to the rad.
I'm just passing on what one of the major manufacturers of thermostats suggests as an acceptable testing procedure.
It's fairly obvious that you require more data than that test will provide, and that's fine. Your testing method will provide the answers to your criteria listed above, and the "factory" testing method will simply prove that the thermostat is FUNCTIONING, but not provide the specific temperature at which it is opening. For some that is sufficient and they will trust that the temp. rating stamped on the part is accurate.
I agree that your method will provide better data, but as far as simply testing basic function, the factory "boiling water test" works.
Personally though, I would use the thermometer method to ensure it is functioning as rated, but that is for my own peace of mind.
DISCLAIMER: I only have around 80 posts on this site, so I guess that means I have no idea what I'm talking about. It's also a good indication that I had never touched a wrench prior to my first post and everything that I type should be immediately disregarded and considered inapplicable to the current topic. Carry on.
Help me out a little.....because of the boiling water, I can't tell at what temp the stat opened (there is one in there)....I didn't use a string, but I don't think using a string would tell anyone at what temp the stat opened due to the lack of visibility in boiling water. Wouldn't knowing the stat open temp be more valuable info than jsut knowing it opened? If one doesn't know the temp at which the stat started to open, how can one tell it's functioning correctly?
Remember, the stat does one thing only....determine MINIMUM coolant temp. The rest of the cooling system components, their condition and driving conditions determine maximum coolant temp.
11-22-2014, 12:17 AM
