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Old 06-30-2009, 06:54 AM   #1
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Arrow Thermostat 160 vs 195

Anyone here reduce their thermostat from the manufacturer spec of 195 to 160 or 180? What are the pros and cons. If you look at my other question, you will see my problem and understand why I am asking. I have an over heating problem.

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Old 06-30-2009, 07:06 AM   #2
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I have recently been convinced to use the 195 degree T-stat.

If an engine runs too cold, the fuel/air mixture can separate & allow raw (condensed) fuel into the cylinders. This leads to cylinder wall "washing".

The protective oil coating on the cylinder walls, gets diluted & rinsed away by the solvent action of the gasoline.

This all causes premature engine/ring/cylinder wall wear.

This is also why it's good to warm an engine up for a few minutes, even in a hot climate such as Florida.

Just got back from Boca Raton yesterday. It is damn hot down there!

Nice beaches though.

90YJ 98XJ
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Old 06-30-2009, 07:16 AM   #3
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the only way i would do it, and have is on a vehicle that doesn't have to pass emissions tests, and doesn't get driven all the time, and is older. otherwise, stay w/ 195. esepcially on obd2 cars. i did 180 on my mj, but i'd never go below that either.

also, if you have an overheating issue, simply changing thermostats to a different temp is not the answer. if your 195 t stat is working properly it is not the problem.
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Old 06-30-2009, 07:53 AM   #4

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Which engine do you have? on TJ's they run at 210-215 all day long with the 4.0l. Sounds like you have replaced just about everything you can from reading the other thread. Could be an internal issue of some kind perhaps, or maybe just the gauge.
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Old 06-30-2009, 08:11 AM   #5
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Yes, I have a 4.0. I will see today, but it just makes me nervous with the gauge always getting close to the red, and before it would just keep going and overflow out the reserve. I definitely think I missed it when I flushed the radiator and then went from there. I should have seen the temp on the radiator. Costly mistake. At least now the temp goes up and then drops like it should.
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Old 06-30-2009, 09:17 AM   #6
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i run a 180 in mine. i like a little bit of room on the hot side of the gauge.

i was having heating issues on mine before, so i changed radiators, water pump, and went to a 180 tstat. runs good now.

also, fwiw, on my 360 Ram, i ran a 180 to keep it from pinging on 87 octane. every five degrees in t-stat reduction is about like 1 octane boost. on the Ram, anything lower than 180 would set a code. i didnt go lower on my jeep because i saw no need.
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Old 07-07-2009, 01:31 AM   #7
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Originally Posted by dreider View Post
Anyone here reduce their thermostat from the manufacturer spec of 195 to 160 or 180? What are the pros and cons. If you look at my other question, you will see my problem and understand why I am asking. I have an over heating problem.
run as hot as you can stomach. 180 is a min in my mind. any lower than that and you can start 'coking' up the engine and not heating up oil enough to steam out the moisture. a lot more acid reactions and such.

new cars are running 220 and higher.. some for smog reasons... im a trad hot rod guy w/no FI or computers... 180 is nice for less pinging and i have a better margin of heat.

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