Overheating problem

[MikeE024]

Wouldn't running at high rpm's cause an overheat situation if the system cannot dissipate the heat?

Yes, it certainly could. And we might be seeing that happen in this thread.

When driving on side streets with 35s and proper gearing, I've noticed that my ETCs generally run cooler if I'm revved up in 3 compared to if I'm pushing along in 4 since my water pump and fan are both spinning faster without there being a bunch of load on the rig.

We don't know if his clutch is doing it's job in lower speeds, but we can assume the clutch isn't causing him to overheat if he drives faster than 55 mph.

I'd want to drive it with no thermostat to see if the temps drop. OP said his temps were at 215 at 55 mph, so I'd want to go faster to see if the temps hold up. If his temps do hold up, then I'd be looking at installing a thermostat that is proven to open as it should.

If the temps now only overheat at lower speeds I'd be looking at the fan clutch. @Dvaniwaarden11 have you confirmed if the fan is pulling air towards the engine instead of pushing towards the radiator?

 

[Deputy Dodge]

The answer may have been staring us in the face the whole time. If a fan is put on backwards it will still pull air through the radiator towards the engine, but it will be much less efficient. And that may be why it looks like it is so far outside of the shroud. I would pull it off and confirm it is on the correct way.

 

[MikeE024]

The answer may have been staring us in the face the whole time. If a fan is put on backwards it will still pull air through the radiator towards the engine, but it will be much less efficient. And that may be why it looks like it is so far outside of the shroud. I would pull it off and confirm it is on the correct way.

Figured I’d just throw the fan direction question out there in case he didn’t check. I put mine on backwards during the first install after I bought the rig, and you could tell right away by feeling the air and then by looking at the blades that it was on backwards.

I felt kinda bad for not thinking to mention it sooner as a simple shot in the dark. But it didn’t really make sense to look at that for an over heat issue that only happened at fast highway speeds. It makes more sense as an explanation for him getting hot in town and on side streets.

Leave no rock u turned at this point.

 

[Dvaniwaarden11]

Yes, it certainly could. And we might be seeing that happen in this thread.

When driving on side streets with 35s and proper gearing, I've noticed that my ETCs generally run cooler if I'm revved up in 3 compared to if I'm pushing along in 4 since my water pump and fan are both spinning faster without there being a bunch of load on the rig.

We don't know if his clutch is doing it's job in lower speeds, but we can assume the clutch isn't causing him to overheat if he drives faster than 55 mph.

I'd want to drive it with no thermostat to see if the temps drop. OP said his temps were at 215 at 55 mph, so I'd want to go faster to see if the temps hold up. If his temps do hold up, then I'd be looking at installing a thermostat that is proven to open as it should.

If the temps now only overheat at lower speeds I'd be looking at the fan clutch. @Dvaniwaarden11 have you confirmed if the fan is pulling air towards the engine instead of pushing towards the radiator?

Fan confirmed pulling air through radiator. If I drove faster than 55 on the freeway I would be in the 230 range and then would overheat. Hence why I didn’t go faster than 55 because 55 proved that I would overheat faster and under more load going up hill.

 

[Dvaniwaarden11]

The answer may have been staring us in the face the whole time. If a fan is put on backwards it will still pull air through the radiator towards the engine, but it will be much less efficient. And that may be why it looks like it is so far outside of the shroud. I would pull it off and confirm it is on the correct way.

This is insane because I have no clue which way my fan is facing right now. I’m having surgery today but the Jeep is with my mechanic I will follow up. That would be so crazy for it to be so simply that they put it on backwards lol

 

[MikeE024]

This is insane because I have no clue which way my fan is facing right now. I’m having surgery today but the Jeep is with my mechanic I will follow up. That would be so crazy for it to be so simply that they put it on backwards lol

IIRC, you can compare the blade shape and how they attach via the rivets to photos online for confirmation. Your mechanic should be able to handle it, but I can send over a photo if he needs a comparison.

Best of luck with surgery man. Hopefully, you and your Jeep will be good to go very soon.

 

[JKP]

From your pic on the first page, it appears to match my YJ, which has pretty much the same clutch and belt routing.

 

[lBasket]

From your pic on the first page, it appears to match my YJ, which has pretty much the same clutch and belt routing.View attachment 545215

Yeah mine is same direction

 

[MikeE024]

From your pic on the first page, it appears to match my YJ, which has pretty much the same clutch and belt routing.View attachment 545215

Nice catch. I agree, his fan looks good in the photo.

Edit:

His mechanic probably hates us lol "Yes, I know which direction to install a fan."

IMO, it's still worth running with the thermostat removed and then boil the new device while it's out to ensure it opens. We haven't confirmed this yet.

 

[Dvaniwaarden11]

Yeah mine is same direction
View attachment 545218

Your fan is way way closer to the radiator than mine!

 

[lBasket]

Your fan is way way closer to the radiator than mine!

Weird. Is the shaft off your water pump short or something?

I looked up what water pump I have it is a napa special Part #: TFW 42005

 

[JKP]

The shaft is part of the fan clutch.

 

[lBasket]

The shaft is part of the fan clutch.

Sheesh you're right I forgot. I replaced the clutch like 3 weeks ago too haha

 

[MikeE024]

Your fan is way way closer to the radiator than mine!

I don’t see the difference causing you to overheat while going 75mph on the highway.

Your clutch doesn’t look far away from the radiator. The blades look a bit more pulled out but idk if that’s just the camera angles.

 

[MikeE024]

If you decide to change the clutch, it looks like you’d run the Hayden 2737

Amazon link

Screenshot from RockAuto (before shipping):

 

[lBasket]

It looks like you’d run the Hayden 2737

Amazon link

Screenshot from RockAuto (before shipping):

View attachment 545267

Exactly what I put in.

I agree that doesn't seem relevant for highway speed overheating but his fan did look different

 

[MikeE024]

Exactly what I put in.

I agree that doesn't seem relevant for highway speed overheating but his fan did look different

Yea man at this point we are just pointing things out the best we can. I feel bad for OP, who has been pretty darn patient for someone who is having these issues after a new engine was installed.

 

[MikeE024]

Yea man at this point we are just pointing things out the best we can. I feel bad for OP, who has been pretty darn patient for someone who is having these issues after a new engine was installed.

Just found a photo of what my stock fan looked like with a Mopar clutch installed. It looks further away from the radiator due to the camera angle.

 

[Dvaniwaarden11]

Just found a photo of what my stock fan looked like with a Mopar clutch installed. It looks further away from the radiator due to the camera angle.

View attachment 545672

That mopar clutch looks way bigger than the one on my Jeep.
My mechanic is eliminating the clutch with a nut or something. Forget what he called it but they used to do this all the time back in the day to make it a solid fan to see if the clutch part of the system is the issue. I forget what he called the part but it will be interesting to see if the clutch is the issue.

 

[MikeE024]

That mopar clutch looks way bigger than the one on my Jeep.
My mechanic is eliminating the clutch with a nut or something. Forget what he called it but they used to do this all the time back in the day to make it a solid fan to see if the clutch part of the system is the issue. I forget what he called the part but it will be interesting to see if the clutch is the issue.

Yea, mine was a bit thicker and looks like the Hayden 2791 that's in it now.

Yours is probably thinner like the Hayden 2737.