Thermostat in 258 - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-28-2000, 05:59 PM
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Thermostat in 258

What temp thermostat should a 1986 CJ7 258 have? The Stant book says OEM 195 and the one I took out was a 180. The jeep had been worked on before so now Iím not sure. Thanks in advance for the advice.

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post #2 of (permalink) Old 04-28-2000, 07:13 PM
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Re: Thermostat in 258

My '83 258 has a 180. It is a very worked engine though and I live in the Dirty South, so cooling is very important. I have no problems at all keeping it at 180, even in the summer.

Ed

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post #3 of (permalink) Old 04-29-2000, 07:56 PM
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Re: Thermostat in 258

As far as I know the higher temp. should make the engine run more efficient. A good thermostat like the lifetime Stant will keep the engine in the right range. Just make sure that your rad. is in good condition.

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post #4 of (permalink) Old 04-30-2000, 12:10 PM
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Re: Thermostat in 258

If CJDave were listening to this post, he'd tell you to be sure to drill a hole (probably about 3/16") in the flat disc part of the thermostat to make sure that air bubbles can get by it...If the hole isn't drilled, the bubbles can build up right at the thermostat and prevent it from opening properly (I think because the air doesn't transmit temperature as well as H20).

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post #5 of (permalink) Old 05-01-2000, 02:46 PM
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Re: Thermostat in 258

180 or 195 works fine, but don't go lower. As stated above, too low and the engine does not run as effecient. If you have a stock radiator with fan shroud...and its all working well, go 195. Most 258's that I have seen run right around 200-210 under normal conditions...that will also give you the best gas mileage.

John......southern CA
84CJ7, 3"lift, 32"BFG, 4.10's, ARB Locker, Solid Axle's, Durabak
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