Does a 180 degree thermostat run engine at 195? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-20-2003, 12:04 PM Thread Starter
 
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Does a 180 degree thermostat run engine at 195?

I was told today (by a very experience Jeep person), that if I use a 180 degree thermostat, that I can expect my engine to run at 195. And if I use a 195 thermostat (I have now), I can expect to the engine to run 205-215 always.

Is this correct? I thought that a 195 thermostat would run my engine at 195, that's why I put that in?

I've been trying like crazy to reduce my temp from 210-215 (fan shroud, timing, air bubbles, etc), but with no luck. If this is it, I'm gonna kick myself, or better yet, the thermostat manufacturers.
Advice?
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post #2 of (permalink) Old 06-20-2003, 12:14 PM
 
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Re: Does a 180 degree thermostat run engine at 195?

The degree rating on a thermostat only indicates at which temperature it will open. On most vehicles, the coolant temp will be slightly higher than the thermostat rating. Try a 180* and see if your temps go down. If they don't, look towards other problems - restricted radiator/heater core, collapsing coolant hoses (usually the lower one), and possibly but not likely a water pump.
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post #3 of (permalink) Old 06-20-2003, 12:52 PM
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Re: Does a 180 degree thermostat run engine at 195

They open up at the temp rating. I'd put in the 180. The 195 is lettting your engine get too warm before it opens up and begins cooling. Plus, check the thermostat. I have gotten 2 in a row that were bad. Don't know what the odds are but it does happen. Happy hunting!

Scott
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post #4 of (permalink) Old 06-20-2003, 01:28 PM
 
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Re: Does a 180 degree thermostat run engine at 195?

Check this previous post containing TONS of good information on thermostats and cooling. Basically, the thermostat does not control the upper temp of your engine.
Good luck!
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post #5 of (permalink) Old 06-20-2003, 03:03 PM
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Re: Does a 180 degree thermostat run engine at 195?

Ok, so what do you want the temperature of a 4.0L to be at????? Mine sits at 210....

Is this too hot????

1996 4.0L
post #6 of (permalink) Old 06-20-2003, 05:22 PM
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Re: Does a 180 degree thermostat run engine at 195?

I'd look toward other problems. Yes a 180* thermostat will keep your jeep cool for a little while, especially during warm up, but it eventually all the water will get above 180* and it will remain open. Then your jeep will be right back to 205-210*. I tried this on my Jeep and that's how it happened. It prolonged the overheating, but it eventually did it anyways.
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post #7 of (permalink) Old 06-21-2003, 08:46 AM
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Re: Does a 180 degree thermostat run engine at 195?

try taking the hood off and going for a drive. If it is an air flow problem, it should run cooler. If it still runs hot then it is a capacity problem. Either the radiator is too small or clogged.
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post #8 of (permalink) Old 06-21-2003, 09:20 AM
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Re: Does a 180 degree thermostat run engine at 195?

An easy way to tell if a radiator's clogged = warm it up till it's near operating temp - make sure the thermostat has opened.
Then feel the radiator core with your hand (engine stopped of course.) If you feel hot and cold(er) spots on the core, the cooler portions are plugged - hot water's not flowing through that part.

Sometimes it's a clutch or viscous fan that's not locking up - hard to tell when it's cold. Symptoms are overheating or running hot at higher speeds.
If it has one - Warm it up till it's hot, then try pushing a cardboard box in the fan (from the engine side - the back of the blades) to try to stop or slow it down. If you can slow the hot fan the clutch is gone.

Some guys use their hand to try to stop it - you can tell if they've tested fans with good clutches by the number of fingers missing. DON'T!
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