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Old 06-30-2016, 11:06 AM   #1
Cgisick
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Default Coolant overheating and dumping contents.

I have a 2001 saturn sc2 and have had an on going issue for the past few years off and on. If I let my car idle for too long say at a drive through or stopped by a train, steam will start to rise from the passenger side of my hood and as soon as I kill the engine I can hear as see the entirety of the content of my coolant resevoir dumping onto the ground. Upon inspection the cap of the resevoir has blown off and the tank is empty. This has happened multiple times and I have replaces the thermostat temp sensor, and a couple of hoses which stopped the problem for about a year or so. Recently however my car has had a couple of instances where I will start the car and it sputters, almost dieing, and it idles rough, and now it is dumping all of my coolant again't and popping off the resevoir cap. Huge headache ! Anyou help would be very much appreciated!!

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Old 06-30-2016, 11:37 AM   #2
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Default Re: Coolant overheating and dumping contents.

Quote:
Originally Posted by Cgisick View Post
I have replaces the thermostat temp sensor
The what, now?

Do you mean the ECTS, this thing below?

Does your radiator fan turn on when you turn the AC on, or when the temp gauge reaches past half?


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Old 06-30-2016, 11:48 AM   #3
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Default Re: Coolant overheating and dumping contents.

Are you saying that the coolant cap is actually "blown off" its threads???
Have you checked ^^ above, and replaced with a new cap from the parts store, or just put the same cap back on?

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Old 06-30-2016, 02:14 PM   #4
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Default Re: Coolant overheating and dumping contents.

^^^^^^^^^^^^^

Replace the cap as suggested above. The older the cap gets, the more it loses its ability to keep pressure (especially in neglected cooling systems with dirty/contaminated fluid). So just replace the cap with a new one that can hold the pressure.

Also, if the heater core (or any part of the cooling system really) is clogged, this may be causing excess pressure buildup. Flush the system with the thermostat removed to fix this.

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