[teejmcd]

Originally Posted by rustywrangler

Only saying this because it has happened before:

DO NOT DO THIS TEST WITH THE ENGINE RUNNING!!!!!!!!!!!!!!!!

i think id rather touch the fan blade off a jeep then 1 off my old blazer in Wisconsin.... that might take a hand off ahaha

[Not4Mud]

May sound dumb....but make sure they sold you the right water pump. I had a yj that I bought that would overheat but I knew the engine needed rebuilding also. Right after we put in the new engine and new water pump it immediately ran hot. Come to find out on the one we had the blades on the inside turned one way and the one we needed they turned the other. Got a different water pump and no more overheating problems. It sounded stupid to me too, but after switching the problem was gone.

[rustywrangler]

Originally Posted by Brandon_YJ

You have GOT to point me to the thread where this happened (if any)!!
That's like people taking Preparation-H orally.... and stuff.

Looking for it now.

[SimonTuffGuy]

Thanks for the check tips on the fan clutch. I'll try that out today when I get back home.

I'm interested in seeing this thread as well.

[SimonTuffGuy]

Alright... I got a new fan clutch... Put it in last night, but I think we may have mounted the fan fins backwards.

I removed it this morning, but then got really confused because there is "front" written on the one side... Does that mean it goes towards the front of the Jeep, or the front of the engine?

By looking at my Hayne's manual (page 3-5, picture 5.9) - If I put my fan that way (so that the rivet screws back piece is towards the engine), then the "front" text on the fan is facing the engine, not the front of the Jeep.

Before replacing this piece. My fan really blew air back onto the engine. Now it seems to be forcing its way at the radiator and shroud.

I'm guessing that I have it on backwards... But, I got confused by the "front" text on it. Can someone confirm that "front" should be facing the engine?

Thanks...

[havasu]

If the fan is not sucking air from the radiator and blowing towards your engine, then you installed it backwards.

[SimonTuffGuy]

Over lunch, I went home and compared the old fan clutch to the new one. I put the fan back onto the old unit, the same way it came off (compared the "marks" that the bolts left). I did install it the same way as it was before. That means the front text is facing the front of the vehicle.

Is it possible that the thing is spinning the wrong way by chance? What way should the fan spin when the engine is running? Clockwise or counter clockwise?

[jeepwrnglr92]

I feel your pain man. I went over this for months. See my thread. i have pictures too.
http://www.jeepforum.com/forum/f12/jeep-still-over-heating-even-after-head-job-468565/

[SimonTuffGuy]

Ouch... Hopefully I can get away with less pain than that...

I'm going to check the belt routing, direction of the fan and stuff tonight when I get home from the office.

[SimonTuffGuy]

Alright... The belt is routed properly... I reinstalled the old fan clutch, exactly the way I removed it.

The fan is STILL pushing air against the radiator isntead of pulling it back towads the engine.

Does anyone this this could be because of having the wrong water pump installed? I'm looking at the water pump pulley... The belt goes around it and makes it turn clockwise... If I have a reverse water pump, will that make the fan spin clockwise, or counter clockwise?

I'm at a loss here... I guess I'm dropping it back off at the shop tomorrow and I'll have him look at it.

If anyone has suggestions for me to tell him, I'd appreciate hearing them.

[SimonTuffGuy]

Well, I went down to my neighbors a block down the street from me. He's got a TJ with the I6 as well, so I took a peak at his radiator fan setup... It's the same as mine, and blows air the same as mine. So, I'm guessing that it IS right after all, and I'm just losing my mind.

Hopefully the tstat will fix the overheating problem now.

[Siller]

I had the same issue when I bought a new waterpumo which rotated in a wrong way and there the problems began.
Check that you have the right waterpump.

[yjfanatic]

this is a pretty common problem with the YJ's.........just be thankful you don't have an XJ with closed system cooling! I'd betcha money that the Jeep isn't running hot at all.......sounds to me like air in the line. One way to tell is if you can hear water trickling down the heater core when it's cold?? Take the radiator cap off and start the jeep. Make sure the Jeep is cold before you do this......let it get up to running temp...you will notice air bubbles coming out the top of the radiator and probably coolant too. Just let it idle about 10-15 minutes and keep topping it back off with coolant. When the bubbles stop appearing, problem should be solved. Let me know if this doesn't work......

Originally Posted by SimonTuffGuy

Took the Jeep out for a 30 mile ride on the highway last night... About 3/4 of the way there, I noticed that the temp gauge was a bit higher than normal... I'd say like 230-240 area (just right below the red).

Parked it last night and went out this morning to a small puddle of coolant under the Jeep. Added a bit and then started the Jeep. Let it run for a few minutes and realized it that it was leaking more. Crawled up under and saw that it was leaking from where the pump comes off the engine, ran down the hose and then dripped to the ground.

Stopped by the local garage and the owner (also a YJ owner) said that it was a sign the water pump was failing. Said to leave it, he'd check it out and replace it.

Got it back this afternoon. A new pump was installed, I told him to replace the serp. belt because mine was cracked.

Picked it up and drove home. The gauge went right back to where it was before, right below the red line area. Got it home and parked it, then called the shop to see what he thought. He said possibly needed a new thermostat too, but he didn't have 1 in stock.

So, I grabbed the Hayne's manual. In the cooling/heating section, it says if the engine is running hot, check the upper radiator hose. If that hose isn't hot, the tstat is probably stuck close. Mine was hot. The engine warmed up quickly, had blazing hot heat, etc. Soo... I'm at a loss here.

In the troubleshooting section, it says it could be a bunch of things... Insuffient coolant (it's filled to the top), drivebelt defective (just replaced), core blocked (possibly? He didn't say about draining it), faulty tstat, fan not functioning (It's blowing, so... I'm guessing it's ok?), timing incorrect, defective water pump, rad cap not maintaining proper pressure...

Anyone have suggestions? Would replacing the tstat be the easiest thing to start with to see if that resolves the issue? Any help is getting this fixed would be appreciated.

[jeepdude1987]

Originally Posted by yjfanatic

this is a pretty common problem with the YJ's.........just be thankful you don't have an XJ with closed system cooling! I'd betcha money that the Jeep isn't running hot at all.......sounds to me like air in the line. One way to tell is if you can hear water trickling down the heater core when it's cold?? Take the radiator cap off and start the jeep. Make sure the Jeep is cold before you do this......let it get up to running temp...you will notice air bubbles coming out the top of the radiator and probably coolant too. Just let it idle about 10-15 minutes and keep topping it back off with coolant. When the bubbles stop appearing, problem should be solved. Let me know if this doesn't work......

If it keeps bubbling for ever then you have a blown head gasket and/or a warped or cracked head. I am fixing a similar problem with my 87YJ. Your technician at the shop should have had the right pump, but it wouldn't hurt to ask which he put in. Also, I would just replace the thermostat with a fail safe one that will die in the off position, and i would consider replacing the radiator cap or at least having it tested. You may look at flushing the radiator just to make sure there is not clogging. Your fan should be pulling air in through the radiator to the engine compartment not pushing it out. If it isn't there is something wrong.

[blake989]

Originally Posted by SimonTuffGuy

Alright... The belt is routed properly... I reinstalled the old fan clutch, exactly the way I removed it.

The fan is STILL pushing air against the radiator isntead of pulling it back towads the engine.

Does anyone this this could be because of having the wrong water pump installed? I'm looking at the water pump pulley... The belt goes around it and makes it turn clockwise... If I have a reverse water pump, will that make the fan spin clockwise, or counter clockwise?

I'm at a loss here... I guess I'm dropping it back off at the shop tomorrow and I'll have him look at it.

If anyone has suggestions for me to tell him, I'd appreciate hearing them.

something is wrong here. I'm no where near my jeep so I can't confirm this, but the fan should be "pulling" air through the radiator, not pushing. Heavy equipment, generators, etc. push air through because they either don't move or move real slow. Cars on the otherhand, move fast so they usually pull air via the fan and are assisted by the speed of the vehicle. maybe i've lost my mind though?