Back in January I rebuild my 1995 jeep wrangler yj Rio grande 2.5 did it my self now if I put in a thermostat in it will over heat to like 240 tried a 180 and a195 thermostat both overheat. New radiator two row, not so old water pump, new hoses. I'm running a electric fan. Try different things can't figure it out
It may be a stupid question but are you putting the thermostat in upside down? I know I have done it before and I have professional mechanic friends of mine that have accidentally done the same
1989 Base 2.5Low Output,
5SPD trans, 2" Body lift, 235/75R15 AT's
Fondly named by my wife: Latisha (in the spirit of the Dolly Parton's song "Jolene")
Do what you can where you are with what you have. ~ Theodore Roosevelt
Flushed out the heater core no problems pretty clean. The gage has been checked new temperature sensor in the block. I though I put the thermostat in the wrong way but I didn't it opened up and was flowing.
Can't remember the brand of the electric fan I think its a 16 inch from Advanced Auto Parts been working good
Is it possible that when you rebuilt it that either a gasket didn't line up properly, or some sealant blocked some of the holes for the coolant to flow properly, also is it overheating per the guage, or because it's blowing the radiator cap. Is it possible that the sender in the block is ok, but the guage itself is bad. Along this line of thinking can you get an infered reading?
I onetime put an intake manifold on an old lincoln. The oem intakes were bad so I replaced it with a respected aftermarket intake. I was increadably careful, but what I didn't do or think about until after the car ran like crap was that I forgot to check the quality of the mold. I had to take the whole thing back apart only to find lots of excess plastic that should have been trimmed at the factory. And I should have checked. Moral of my story is if you've checked all the things outside the engine. Ie hoses aren't clogged, thermostat is in correctly, waterpump is the correct one, and the belt is on correctly, radiator and thermostat are good. Fan is working, and shrouding is in place (fan works like crap without the shrouding) it's got to be internal I would think. But I'm no professional.
Some gaskets are universal fit. Did you compare the old gasket with the new one to make sure it matched, and that there were not any holes you were supposed to cut? Because I agree I don't think it's lined up wrong per se. If you don't remember and still have the old one maybe take it to where you bought the other one and double check.
I have been following your posts, and all things being equal as running OK since January until the thermostat was put in. I am wondering that if there was an air pocket after the thermostat change that over heated the engine, loosened the head and caused a leak at the head gasket or cracked the head I think I would pressure test the cooling system cold and hot to see if the problem is at the head gasket. At least you will confirm or rule out a leak at that point so that the head my not have to come off. Otherwise there is a blockage/restriction in the system (radiator, lower radiator hose collapsing, thermostat not clocked correctly etc). Good luck, let us know what you find.
Keep the rubber side down and
the shinny side up...........