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Old 01-06-2008, 01:18 AM   #1
intence
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Help - Coolant Boiling Over

After relatively few problems over the past year, I started having boil-over issues this week.

Car seems to run fine, but boils over when shutting off usually, i've done the following:

-Checked that the fans come on, and changed the thermostat + Coolant Tempature Sensor just in case, checked the relays for the fans too

-Water *seems* to be going through all of the pipes, and I get heat if I turn on the heater

-Drive the car for a bit, but after I shut it off, the coolant boils over (sometimes this happens before I shut it off)

The coolant fill tank w/cap was changed under a year ago, so it's doubtful that it's the cap. I'm thinking maybe a radiator issue, but then i'd a have leak there no?

Any idea what else could be causing the boil-over, and how to isolate/pressure test parts of the system?
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Old 01-06-2008, 05:14 PM   #2
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Maybe too much water in the coolant. Thats my guess
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Old 01-06-2008, 05:18 PM   #3
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check your oil and see if you can see coolant in it.


It sounds like the beginning of our lovely LIM going bad. LIM meaning lower intake manifold.

Also check the thermostat and see if its open and not closed.

Also check your water pump for leaks.
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Old 01-06-2008, 08:35 PM   #4
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I would double check the cap just to be safe. I'd take it all the way off and put it on again making sure you tighten it really good. If that solves your problem then you've saved yourself a lot of money.
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Old 01-06-2008, 09:49 PM   #5
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Quote:
Originally Posted by intence View Post
After relatively few problems over the past year, I started having boil-over issues this week.

Car seems to run fine, but boils over when shutting off usually, i've done the following:

-Checked that the fans come on, and changed the thermostat + Coolant Tempature Sensor just in case, checked the relays for the fans too

-Water *seems* to be going through all of the pipes, and I get heat if I turn on the heater

-Drive the car for a bit, but after I shut it off, the coolant boils over (sometimes this happens before I shut it off)

The coolant fill tank w/cap was changed under a year ago, so it's doubtful that it's the cap. I'm thinking maybe a radiator issue, but then i'd a have leak there no?

Any idea what else could be causing the boil-over, and how to isolate/pressure test parts of the system?
What your describing is something that happened to me with my previous car. The problem was a bad headgasket.
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Old 01-06-2008, 10:18 PM   #6
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Changed the Radiator cap, not sure if it made any difference, but now the temperature goes past 210/220 and well into the overheat zone.

Going to try the waterpump next, as it's only about $22 or so at Autozone. As for the LIM, it was done once by a shop, leaked again after a year, and then done again last year. I'm REALLY hoping it's not the LIM, didn't see any water on the block or near the LIM, so i'll try the waterpump.

How can I tell if it's a block someplace, or a problem with the Radiator? Right now i'm hoping it's ANYTHING else but the LIM, i'm really not looking forward to pulling off the heads, and changing those gaskets again.
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Old 01-06-2008, 10:31 PM   #7
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Try bleeding the coolant system
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Old 01-07-2008, 12:33 AM   #8
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Quote:
Originally Posted by intence View Post
How can I tell if it's a block someplace, or a problem with the Radiator? Right now i'm hoping it's ANYTHING else but the LIM, i'm really not looking forward to pulling off the heads, and changing those gaskets again.
You could get the cooling system pressure tested. Also, if you re taking the heads off to replace the LIM gaskets you are doing toomuch work.
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Old 01-07-2008, 12:35 AM   #9
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Try bleeding the coolant system
Agree with everyone else about checking for the LIM leakage (as I'm on my third now ) but bleeding the coolant system is a def. must if it has already boiled over and you just refilled it and closed the lid. Air pockets are a killer that will cause the problem repeatedly I've found.
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Old 01-07-2008, 08:46 AM   #10
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your best bet is to do a pressure check to see if its the head gasket and a pressure check on the radiator. If its boiling over at 220 then the radiator mixture is off because antifreeze also increases the boiling temperature of water.
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Old 01-07-2008, 11:36 AM   #11
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Stupid question, but what's the easiest way to bleed the system?

I've been openining the cap, filling water, then starting the car (with the heater on) and keep filling until it doesn't take any more. Shut off car and close the cap TIGHT.

Is there a better way?
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Old 01-07-2008, 11:41 AM   #12
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Are you filling the coolant up when the motor is cold?
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Old 01-07-2008, 11:46 AM   #13
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Originally Posted by intence View Post
Stupid question, but what's the easiest way to bleed the system?

I've been openining the cap, filling water, then starting the car (with the heater on) and keep filling until it doesn't take any more. Shut off car and close the cap TIGHT.

Is there a better way?
Bleeder valve screw. There should be a diagram and/or picture floating around the forums somewhere. It's a bronze/goldish screw located in front of the LIM IIRC.
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Old 01-07-2008, 01:04 PM   #14
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Quote:
Originally Posted by intence View Post
Stupid question, but what's the easiest way to bleed the system?

I've been openining the cap, filling water, then starting the car (with the heater on) and keep filling until it doesn't take any more. Shut off car and close the cap TIGHT.

Is there a better way?
Every time I've done it is with this method.

1. Open bleeder and remove radiator cap.
2. Fill coolant system until fluid comes out of bleeder.
3. Close bleeder and start engine.
4. Fill reservoir tank until about 3/4 full and then replace radiator cap.
5. Go for a drive and keep close eye on temp gauge until engine is at operating temperature.
6. Verify that engine will stay at operating temperature.
6. Park vehicle over night and check reservoir tank before driving car again. Fill as necessary (should be a small amount).
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Old 01-07-2008, 01:09 PM   #15
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Quote:
Originally Posted by Sprucegagt View Post
Every time I've done it is with this method.

1. Open bleeder and remove radiator cap.
2. Fill coolant system until fluid comes out of bleeder.
3. Close bleeder.
4. Fill reservoir tank until about 3/4 full and then start engine.
5. Go for a drive and keep close eye on temp gauge until engine is at operating temperature.
6. Verify that engine will stay at operating temperature.
6. Park vehicle over night and check reservoir tank before driving car again. Fill as necessary (should be a small amount).
Is this with the car on? I'm assuming yes but just want to clarify for intence.

I'll have to try that method tonite. Generally I just fill when the car is cold, close the reservoir and start the car. As the car is running open the bleeder valve until coolant comes out in a steady stream with no air pockets.

While we're on topic should Dexcool be mixed 50/50 or can I use straight Dexcool? I've heard both and I've never seen a diff. either way.
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Old 01-07-2008, 01:24 PM   #16
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I read that part jerk.

I've just never filled with the bleeder already open or radiator cap off, so you can only fill the reservoir up with so much coolant before it's full.
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Old 01-07-2008, 01:25 PM   #17
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Is this with the car on? I'm assuming yes but just want to clarify for intence.

I'll have to try that method tonite. Generally I just fill when the car is cold, close the reservoir and start the car. As the car is running open the bleeder valve until coolant comes out in a steady stream with no air pockets.

While we're on topic should Dexcool be mixed 50/50 or can I use straight Dexcool? I've heard both and I've never seen a diff. either way.
I revised my list, it should clarify things.

I use 50/50 mix on my coolant flushes. But I also don't use dexcool either. I've switched to Zerex G-05. Coolant reservoir doesn't sludge up anymore.

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I read that part jerk.

I've just never filled with the bleeder already open or radiator cap off, so you can only fill the reservoir up with so much coolant before it's full.
You know I couldn't resist.

Just keep filling the reservoir until fluid comes out of the bleeder. Then close the bleeder while fluid is coming out.
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Old 01-07-2008, 03:06 PM   #18
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...While we're on topic should Dexcool be mixed 50/50 or can I use straight Dexcool? I've heard both and I've never seen a diff. either way.


Don't put straight coolant in; unless you bought the ready to go 50/50 premix version.
You have to mix it with water.
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Old 01-07-2008, 03:18 PM   #19
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Don't put straight coolant in; unless you bought the ready to go 50/50 premix version.
You have to mix it with water.
You don't know jack MJ.

I don't understand why straight Dexcool would be bad. My car sucks anyhow.
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