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Old 04-11-2014, 10:36 AM
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'99 4.0 Overheated

1999 WJ 4.0L sitting in the driveway idling for a few minutes after a 5 mile drive home from work and overheated throwing coolant out of the overflow and steam from the radiator cap.

I obviously need to do a coolant flush, coolant looks horrible. The Jeep did get a little hot sitting in traffic, but it did cool down once I got on highway and I turned the heat on. Maybe just the thermostat ? I know the heat wasn't the greatest.





I know I need to flush the whole system, heater core, and I will get a new thermostat.

What do you guys think ?
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Old 04-11-2014, 02:08 PM
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Re: '99 4.0 Overheated

As long as it didn't get too hot, you should be ok with a good cooling system care.
Just keep an eye out for bubbles in the radiator, foam in the oil just in case the heating is from a pinholed head gasket.

Your fan should have been in "747 mode" with it that hot... if it wasn't, make sure you fix that.

I'd definitely do a new thermostat and gasket... if your local weather is hot, you might want to consider a HESCO or similar high flow water pump. The HESCO has a billet impeller.

I had a 95 that used to get hot in california weather, with the HESCO and an aftermarket radiator it could easily handle southern Nevada.
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Old 04-11-2014, 02:15 PM
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Re: '99 4.0 Overheated

Quote:
Originally Posted by lstowell View Post
As long as it didn't get too hot, you should be ok with a good cooling system care.
Just keep an eye out for bubbles in the radiator, foam in the oil just in case the heating is from a pinholed head gasket.

Your fan should have been in "747 mode" with it that hot... if it wasn't, make sure you fix that.

I'd definitely do a new thermostat and gasket... if your local weather is hot, you might want to consider a HESCO or similar high flow water pump. The HESCO has a billet impeller.

I had a 95 that used to get hot in california weather, with the HESCO and an aftermarket radiator it could easily handle southern Nevada.
747 mode ? The temp gauge got pegged. I live in MA, so it's not too hot, but it get's warm in the summer.

The oil is clean, and no residue on the oil cap.
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Old 04-11-2014, 02:31 PM
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Re: '99 4.0 Overheated

Your cooling fan should have been making a lot of noise... as in a LOT of noise, particularly if you bring up engine RPM to about 1200. If not, you could have a failing cooling fan.

I've never seen a well maintained 4.0 cooling system run hot to where it pukes coolant or touches the red. The HESCO pump was more to keep it at the lower end of normal range in 120+ temps.
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Old 04-11-2014, 03:18 PM
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Re: '99 4.0 Overheated

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Originally Posted by lstowell View Post
Your cooling fan should have been making a lot of noise... as in a LOT of noise, particularly if you bring up engine RPM to about 1200. If not, you could have a failing cooling fan.

I've never seen a well maintained 4.0 cooling system run hot to where it pukes coolant or touches the red. The HESCO pump was more to keep it at the lower end of normal range in 120+ temps.
The fan came on with the AC on so it works. Just flushed everything to get all of the old coolant out. Going to get a new thermostat and put it in to see if that works.
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Old 04-11-2014, 05:03 PM
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Re: '99 4.0 Overheated

An other vehicle i've owned had once coolant brown like yours. It caused the radiator to be plugged and overheated the engine.
I also would start with reverse flushing the radiator and engine very well and change the water pump and thermostat.
Eventhough the fan works with AC, its not a guarantee it does with high coolant temps. A different input to the PCM is used for it. So check as well if ,the fan comes on next time the temperature is too high.
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Old 04-11-2014, 05:20 PM
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Re: '99 4.0 Overheated

Just got done flushing everything, heater core, radiator, engine, put new 195 t stat in, bled the system with the heat on. All is well so far after letting it idle for 40 min in driveway checking it, bleeding, adding coolant as needed.

I got the water to be pretty clear while flushing, so I am pretty confident that most of the old coolant is out. If anything happens again, I will get a new radiator and water pump and have it at it then.
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Old 04-11-2014, 08:38 PM
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Re: '99 4.0 Overheated

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Originally Posted by JGiardino89 View Post
Just got done flushing everything, heater core, radiator, engine, put new 195 t stat in, bled the system with the heat on. All is well so far after letting it idle for 40 min in driveway checking it, bleeding, adding coolant as needed.

I got the water to be pretty clear while flushing, so I am pretty confident that most of the old coolant is out. If anything happens again, I will get a new radiator and water pump and have it at it then.
Check the fan and make sure it is kicking on both speeds. When you start the Jeep from cold it should come onto low speed. Once it gets to operating temperature it should engage into a second and you should hear a difference (it's VERY noticeable). If you cannot hear the fan change speeds, that's your problem.
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Old 04-12-2014, 01:12 AM
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Re: '99 4.0 Overheated

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Originally Posted by JeepMe View Post
Check the fan and make sure it is kicking on both speeds. When you start the Jeep from cold it should come onto low speed. Once it gets to operating temperature it should engage into a second and you should hear a difference (it's VERY noticeable). If you cannot hear the fan change speeds, that's your problem.
Will the electrical cooling fan kick in directly when the engine runs? Never heard about this.
As far as i know have the pre 04 models the pwm relay under the right headlight and can the fan run at different speeds, depending on the temperature, but never when the engine is not too hot.
The 04 has two separate relays in the PDC and has two speeds, but also only works when getting too hot.
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Old 04-12-2014, 10:39 AM
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Re: '99 4.0 Overheated

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Originally Posted by Frango100 View Post
Will the electrical cooling fan kick in directly when the engine runs? Never heard about this.
As far as i know have the pre 04 models the pwm relay under the right headlight and can the fan run at different speeds, depending on the temperature, but never when the engine is not too hot.
The 04 has two separate relays in the PDC and has two speeds, but also only works when getting too hot.
I'm not exactly sure on the specifics of how it works but I do know that on my fan and my buddies fan (I have an 03 and his is an 01 I believe, both 4.0) there are two separate speeds. I believe the fan kicks on in low speed immediately once the vehicle is started. It's either immediately or very soon after, I would have to check to be sure. But once the coolant reaches somewhere around 200*F you will hear the fan kick into a high speed and it's very noticeable. If that's not happening once it gets on the high side of the operation temp, then that's the issue. My buddy replaced his water pump, radiator, and thermostat before he listened.
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Old 04-12-2014, 04:24 PM
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Re: '99 4.0 Overheated

Quote:
Originally Posted by JeepMe View Post
I'm not exactly sure on the specifics of how it works but I do know that on my fan and my buddies fan (I have an 03 and his is an 01 I believe, both 4.0) there are two separate speeds. I believe the fan kicks on in low speed immediately once the vehicle is started. It's either immediately or very soon after, I would have to check to be sure. But once the coolant reaches somewhere around 200*F you will hear the fan kick into a high speed and it's very noticeable. If that's not happening once it gets on the high side of the operation temp, then that's the issue. My buddy replaced his water pump, radiator, and thermostat before he listened.
You are probably talking about the viscous clutch fan mounted on the water pump, but not the electrical. The viscous clutch fan idles at a out 300 rpm and goes to high speed when the engine coolant temperature rises too high. It should work in combination with the electrical fan, so could be the problem in case of overheating.
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Old 04-12-2014, 05:20 PM
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Re: '99 4.0 Overheated

OK, so the jeep overheated again, and the fan wasn't running. Would that be the relay / resistor under the passenger headlight ? Or what else could it be.
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