Jeep is overheating at idle
- Thread starter Jonas Menges
- Start date
Severe duty fan clutch. It pulls lots of air.. had nice oem water pump. But changed it anyways.. seeems lots of these 4.0 have this isue
You said you got the radiator from Advance Auto Parts. When an auto parts store says "OEM replacement", that just means they're selling you a part that will physically replace it... i.e. it will fit. That doesn't mean they gave you the actual OEM Mopar radiator that easily cools better than any store brand radiator. Store brand radiators absolutely do NOT cool as well as the OE Mopar radiator does.
We're talking about the radiator being the likely cause of your overheating. If you don't want to believe it could be the store brand radiator you installed causing your engine to overheat, go for it. I will say that simply installing the Mopar radiator cures overheating that new store brand or internet brands of radiators didn't. Fact, not opinion.
Edit: And if your OE Mopar radiator was marginal from having been clogged with crud like hard water deposits, replacing it with a marginal store brand that is already marginal when it's brand new, as most are, won't fix anything.
But it sounds like you have your mind made up that it couldn't possibly be the store brand radiator you installed so I'll back out of this.
The fan clutch sounds like the most likely culprit for overheating at idle, but what if my high temp problem started out the exact opposite? I was on a road trip and it constantly shot above 210 when I would get up to around 50 MPH, I could slow down a little and get it to drop to around 200-205. However, anytime I got to a full stop it would immediately fall to normal temp range. I pulled over when getting into a small town and opened the cap to check the coolant level wondering if maybe I hadn’t adequately filled it after installing a new radiator. It blew
Coolant out like crazy due to intense pressure (and yes, I knew better but thought I could open slow enough to avoid). The coolant level was perfect. From that point on the Jeep ran at a perfect temp on the highway but now shoots up immediately upon stopping. I’ve replaced the radiator and cap. I flushed the cooling system when I did the radiator also.
Could this all still happen from a bad fan clutch?
Coolant out like crazy due to intense pressure (and yes, I knew better but thought I could open slow enough to avoid). The coolant level was perfect. From that point on the Jeep ran at a perfect temp on the highway but now shoots up immediately upon stopping. I’ve replaced the radiator and cap. I flushed the cooling system when I did the radiator also.
Could this all still happen from a bad fan clutch?
Derek V
New Member
I am currently on my 3rd radiator. Most aftermarket are cheap and crack. Anyway, my problem with overheating went away after changing the thermostat. It would get stuck and the jeep would overheat really quickly. After getting the thermostat replaced it hasn't overheated once. Given that you have checked the fan clutch I would look at the thermostat next.
My Jeep is doing the same thing even after changing the clutch fan. My mechanic suspects a leak in the head.
Any other ideas? My Jeep is a grand Cherokee Laredo with 244k miles on it.
Are you losing coolant? If you're not losing coolant is your fan shroud present and in good condition? Is there any mud or dirt in your radiator's external cooling fins?My Jeep is doing the same thing even after changing the clutch fan. My mechanic suspects a leak in the head.
I have the same problem but my heat blows cold and hit when I get the rpms up and then goes cold at idle and jeep starts to rise in temp
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