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Old 02-08-2014, 10:01 PM   #1
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Running hot

My 94 with 2.5 was running hot. It was running up to the red line. Changed the thermostat. Continued same old thing. Running Hot!. So I changed the water pump. No change in temperature. Maybe even running a little hotter. Wasn't any flow in the radiator when running with cap off. Changed thermostat again and temperature sending unit for gauge. No change. Was to the point I thought the head gasket was leaking ...even though there wasn't water in the oil. I decided to try to take thermostat out and run it to see what would happen? Temp was running low temps. Could see flow in radiator. About 185. Took the two thermostats and threw them in a pot and boiled them. They both opened. Now I am almost positive the head gasket was leaking. Remembered reading about vapor lock and the air pocket around thermostat not letting it open. Decided as a last ditch effort to drill a 1/8th inch whole in the thermostat rim. Put it back together and the old girl ran 210•. Took it out and ran it hard. Barely moved above 210•. Fixed! A simple hole in the rim of the thermostat saved me from tearing the head off and replacing gasket. You would think that if this is a usual problem on YJ's when replacing thermostat they would put weep holes in them. Ugh!!! Just glad it wasn't more serious. Hope this helps someone else out there when replacing the thermostat.

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Old 02-08-2014, 10:23 PM   #2
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Thanks for the info. Simple fix that could drive someone nuts and have them going broke tryin to run down the issue.

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Old 02-09-2014, 08:36 AM   #3
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I'm having that same issue, I'll give it a try!!
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Old 02-09-2014, 12:26 PM   #4
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Originally Posted by 94richro View Post
I'm having that same issue, I'll give it a try!!
Good luck I hope it works for you too! I was out again this morning running around and it stayed at 210*.
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Old 02-09-2014, 03:11 PM   #5
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I only replace thermostats with ones that already have the weep hole with a little brass flap. Drilling one yourself works just as well. Just remember to position the hole at 12 o'clock
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Old 02-09-2014, 04:18 PM   #6
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Originally Posted by 87 Florida YJ View Post
I only replace thermostats with ones that already have the weep hole with a little brass flap. Drilling one yourself works just as well. Just remember to position the hole at 12 o'clock
Well where were you when I went to the auto parts store? I wish you would have told me before! Lol. I know now to get one with weep hole or drill it if not.

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