Question about 2003 GMC Savana

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I drive on the open road a lot. My 2003 gmc savana 6.0 has begun to overheat. To reduce engine coolant temp I turn on the cabin heat full blast. that helps. the van has 240k on it, the radiator has been relpaced a few yrs ago, I assume the thermostat too. guess Ill replace the thermost if you have no other suggestions. Thanks

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I would think the thermostat well fix your over heating problem !

Posted on May 25, 2011

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1 Answer

Why do i overheat?


Low coolant level, bad thermostat, bad water pump, dirty radiator on outside, radiator tubes clogged internally, etc.

Till u fix turn on heater full blast & open the windows. It will help keep the engine temps down so you can use it while getting repairs.

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What Does GMC trouble code 1258 signify?


Four digit codes are brand specific. For GM vehicles, code 1258 means the engine computer is in default mode for an engine overheat problem. Most performance options are limited to allow you to get the vehicle off the road or to a shop for repairs.
The engine could have been run hot, or the temp sensor may have failed.

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My 2003 Pontiac Gran Prix overheats in zero degree weather.


Make sure radiator is full and that all hoses are ok. Then make sure that the thermostat is opening and that your water pump is circulating coolant through the radiator which must not be clogged. Till you find issue run your heater full blast with window open to add additional cooling to engine.

Sep 01, 2017 | 2000 Pontiac Grand Prix

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Engine tepmrature goes up or down when i turn on the heater


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Jan 28, 2014 | 2004 Ford F150

1 Answer

1999 jetta overheats until heat is on full blast


You should start by checking the thermostat for the radiator. It controls the flow of coolant to your engine. Turning on the heater allows the coolant to circulate through another type of radiator. You should also check your radiator fluid to make sure you have enough( the fluid should be changed around every 5 years).

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1 Answer

2003 gmc savana rough idle then shuts off


Does it have any power when you start moving? I've seen a lot of plugged catalytic converters. You may want to have an exhaust back-pressure test done.

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1 Answer

I have a 2000 Mercury Cougar and the gauge inside tells me that the engine is over heating, no heat is coming from the heater when I turn it on, the fan for the engine is running at full blast, the engine...


Hi,

The overheating and lack of cabin heat both point to a failed engine thermostat which would be stuck closed. At the warm up stage, the coolant stays in the engine block to bring the engine to efficient operating temperature, then it opens and circulates the coolant through the radiator and heat core. If the thermostat is stuck closed, the engine will overheat, and coolant will never reach the heater core, and you will not get cabin heat.

Blinking oil light at idle which goes away during driving could be a low oil level, but may also be a drop in oil pressue. You could have a clogged oil fliter (at best) pickup tube, or a failing oil pump.

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1 Answer

Driving about 75 mph on interstate and all the sudden engine light comes on and monitor says reducing power to engine. Temp gauge skyrockets and cant drive over 30 mph...?!?!


The temp overheat could have been a false readiing due to a leak or low coolant level in the degas bottle(coolant expansion tank). The overheat signal is what induced the reduced power setting from the computer. Have your degas bottle checked at a dealership or by a competent mechcanic.

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1 Answer

My 1992 lexus es 300 overheats after i get off the freeway. the temp gauge sits in the normal position until i get off the freeway. i run the heat on hot and at full blast regardless of the temp outside...


Sounds like you could be low on coolant, even more so because the air starts to cool down, check coolant level with engine cold, never open a radiator when hot.

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