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Post by LibertyFever on May 10, 2007 20:09:26 GMT -5
My little four cylinder 95YJ has had cooling problems since last December and I blamed it on the clutch fan. On the highway the engine was fine, no overheating problems. Its just when I'm on the trail. In March I replaced the water pump for a second time because of a leak that developed around the bearing (it popped out) . Just last weekend I replaced the water pump again because of a bearing failure (it popped out again) . Shortly after replacing the water pump I replaced the clutch fan with a used one I picked up but to my surprise the engine continued to overheat on the trail . Okay, what haven't I replaced?, the thermostat? So tonight I replaced the thermostat. Great, the engine actually ran cooler on the highway but it was still overheating on the trail what's going on? I happened to check under the hood and realized that air was being pushed towards the radiator. The new clutch fan was pushing the air through the rad not pulling it . Here's some facts; The Jeep four cylinder engine (2.5 L) had came in two versions, a water pump that turned clockwise and a version that turned counter-clockwise depending on the fan belt routing. So I'm expecting that when I open my hood tomorrow I'll replace the water pump's fan blade with the correct model, to pull air through my rad. I'll keep you posted as to the final outcome.
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Post by LibertyFever on Feb 19, 2008 17:38:04 GMT -5
Yes, another mystery has been solved. I popped off the thermostat housing only to discover I had a 160F (71C) thermostat. That certainly explains why I haven't been getting any heat. The new one I picked up from NAPA this time was rated for 195F (90C) which should make it warmer in the old YJ. It's hard to tell just yet with the temps outside hovering about +2C. It should have been a real simple job to change a thermostat providing you follow the instructions on the "water pump/thermostat sealant" and you don't torque the bolts down too much. I did neither On my first attempt I had coolant spraying out. Of course the logical thing to do was tighten the bolts, bad idea, I cracked the housing. After acquiring a new housing & waiting until the temps outside rose above -20C I replaced the housing & thermostat and let the sealant cure a bit. Now I'm so happy ;D, I have my Jeep back on the road and the heater will actually heat.
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Post by charles on Feb 21, 2008 6:06:10 GMT -5
good for you Randy I'm glad that you were able to fix your heating problem finally.
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