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GS - 1st Gen (1993-1997) Discussion about the first generation GS300

Overheating Problem

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Old Oct 5, 2009 | 08:12 PM
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Default Overheating Problem

I have never had an issue with overheating, was driving home and noticed steam coming from under the hood on the passenger side and car was running hot. Pulled over and shut car off. Fluid in overflow was boiling and melted some of the plastic at the top of the overflow container. Let car cool and added about 6 16oz bottles of water to get the car home which was only about 2 miles.

Changed radiator cap, thermostat and refilled radiator. Idled car with cap off to get air out of the system. Car drives fine and stays cool but building too much pressure and coolant continues to go into the overflow container until their is no longer enough coolant in the radiator and begins to overheat.

If I let the car run with the radiator cap off, once the car heats up it will continue to flow coolant out of the radiator cap until radiator level is low.

The system is not leaking coolant on the ground anywhere and it is building plenty/to much pressure in the system.

Any suggetions or ideas? Blown headgasket? Water pump? Bad radiator? Car has 180,000 miles.
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Old Oct 5, 2009 | 08:29 PM
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When was the last time you had the water pump or radiator changed?
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Old Oct 5, 2009 | 08:36 PM
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I have not replaced either since I owned it which is the last about 40,000 miles.
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Old Oct 5, 2009 | 08:45 PM
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Hm maybe a clogged radiator? Do both upper and lower radiator hoses get hot?
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Old Oct 5, 2009 | 08:51 PM
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Upper and lower radiator hoses are both hot and rock solid. Fan is working propely and A/C fan kicks on once the temp gets hot.
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Old Oct 5, 2009 | 09:13 PM
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when my head gasket blew i had the same symptoms but i could still drive with out it over heating... im thinking that the water pump is not recuirclating the water through the system
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Old Oct 5, 2009 | 09:22 PM
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I can still drive it without it overheating but the radiator will continue to loose radiator fluid into the overflow and will eventually overflow the overflow. Once it looses to much fluid to the overflow, after about 30-40 miles, it will begin to overheat due to not enough coolant in the radiator. I fill back up the radiator and it stays at normal temp but continues to loose coolant to the overflow.
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Old Oct 5, 2009 | 10:00 PM
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Could not find how to test the waterpump on alldata, but found something you can try: http://www.ehow.com/how_4829065_test...paign=yssp_art

Hopefully it is not the headgasket. Notice any coolant in the oil?
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Old Oct 6, 2009 | 04:06 AM
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Originally Posted by Aristoman
when my head gasket blew i had the same symptoms but i could still drive with out it over heating... im thinking that the water pump is not recuirclating the water through the system
+1, had the same problem on my old ES
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Old Oct 6, 2009 | 07:43 AM
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Originally Posted by Sleepr
I can still drive it without it overheating but the radiator will continue to loose radiator fluid into the overflow and will eventually overflow the overflow. Once it looses to much fluid to the overflow, after about 30-40 miles, it will begin to overheat due to not enough coolant in the radiator. I fill back up the radiator and it stays at normal temp but continues to loose coolant to the overflow.
Check your oil level and see if you're loosing oil.. also look in the coolant overflow tank and see what color is the coolant in there? and if it has any blackish/brownish chunks.. if thats the case then im afraid its a head gasket problem
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