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Old 06-23-2011, 11:03 PM   #1
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Running very hot! Advice needed soon.

Hey guys,

I 'm wondering if someone can shed some light on the problem I face after my last attempt at fixing my jeep.

I was having a problem with the cooling system so I decided to replace all the parts that looked really old. There were the water pump, thermostat & housing, temp sensor on housing and temp sending unit (connector was broken). I put it all back together warmed it up, let it cool, them went out for a quick spin, only the temp gauge was even more crazy now, it went all the way up to the red then sat just below the red for the remainder of the journey, all 15 miles of it.

When I got back the engine didn't seem abnormally hot and the coolant level was pretty much where it wanted to be, top hose was hot, bottom hose cold.

Basically I'm stumped, so any advice would be great! Also this may sound stupid but how will I know if the Jeep is about to overheat/is overheating?

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Old 06-24-2011, 03:45 AM   #2
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i may be wrong but cold bottom hose usually means the water pump isn't pumping in the right direction. make sure you get the right pump. if your engine is serp belt, it should have a little R on one of the fins and the belt should be routed so that the fan pulley spins counter clockwise or in reverse rotation.

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Old 06-24-2011, 11:55 AM   #3
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There is also a procedure to refill the block, as they tend to air lock and not completely refill (4.2).

Look around and see.

I installed the wrong water pump once; didn't give Q-tec enough info!
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Old 06-24-2011, 12:39 PM   #4
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my jeep was over heating for awhile i ended up buying a whole new radiator and this solved the problem
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and boom goes the dynamite
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Old 06-24-2011, 03:47 PM   #5
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I agree with carl. Check that. Also, you replaced everything except the #1 issue for an old YJ which is a clogged radiator. You went this far. Take the next step and replace it. As was stated, the system likes air so make sure you "burp" it good.
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Old 06-24-2011, 08:40 PM   #6
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I agree with carl. Check that. Also, you replaced everything except the #1 issue for an old YJ which is a clogged radiator. You went this far. Take the next step and replace it. As was stated, the system likes air so make sure you "burp" it good.
Thanks for all the responses, I checked the pump before I put it in and the impeller was the same way as the one taken out, and as for the radiator the PO had changed it less than a year ago. Could it go bad that quickly and how could I tell if it was?

It seems strange but its almost like the sending unit is 30 degrees out. I re-installed the old one and it is reading fine again. Seems to stay around 195-210 degrees. But it is old and I'm not sure how accurate it is so I may just burn $10 and buy another one and see where the majority vote is.
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Old 06-24-2011, 08:53 PM   #7
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Ok so I just got back from a parts store and instead of a new temp sender I went for an IR Thermometer.

Got back lifted the hood and gunned laser beam all over the place, thermostat housing, rad hoses, rad, and the all important place where the temp sender is located, the highest reading I got was 207 degrees. Which is kind of close to what the old sender is communicating to the gauge, it can only be 10 degrees difference.

So.....is that accurate enough to say that all is fine and it was just a 'bad in the box' replacement sender, or will my engine eventually explode?

I contacted the manufacturer and they said that they sell over 300 a month of that model and haven't had any complaints yet.
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Old 06-24-2011, 10:08 PM   #8
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If you're running around 200-210 degrees, you should be good to go.
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Old 06-24-2011, 10:14 PM   #9
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Could be a bad sensor eventhough the mfg says it's not. There should be a way to test the resistance on it to see if it's good.
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Old 06-24-2011, 10:16 PM   #10
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hmmmmm, guess its time for a multi meter, a saucepan, a gas stove and that evil little sensor. Time to find out who's behind all of this!
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Old 06-24-2011, 10:22 PM   #11
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haha where can I ground out in a kitchen that is really old?
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Old 06-25-2011, 01:23 PM   #12
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The thready part of the sensor.
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Old 06-25-2011, 03:12 PM   #13
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it was the other end of the wire i cant find a place to ground. old sockets with no ground.
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Old 06-25-2011, 05:16 PM   #14
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You solved the problem. Leave the old one in. Your thermostat is a 195 which is what you're supposed to have. If you're running between 195 and 210 that's normal. If it ain't broke.... Your rad. is good being only a year old. Your water pump is good. Forget the new sensor there will be alot of other things to keep you busy.
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Old 06-25-2011, 06:22 PM   #15
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Yeah I'm just going to leave it and be happy with the job I did. Thank you all for your advice and input on the matter. I'm new to the whole jeep thing and you guys are a god send!

I'm sure I'll be back in touch soon.

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