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I have a 2005 Chevy avalanche. A few days ago I driving around with my buddies and my temperature gage was at 260 and light came on saying coolant hot. Pulled into a gas station and let it cool down before driving 15 mins back home. I let it sit over night and the next day I went outside and put some coolant in. Drove fine after that but I then replaced my thermostat the next day. After replacing that I kept over heating again. I could not go more than two blocks with out my engine almost over heating. What could be the issue?

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  • Contributor
  • 29 Answers

Assuming you didn't put thermostat in upside down, your system may need to be flushed. if radiator is blocked you can feel a cold spot at the blockage when the motor is warm

Posted on May 07, 2014

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U have a problem with the air temp control blend door actuator motor, very common failure. In order to replace this part the dash must come out.

Posted on Jan 14, 2009

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SOURCE: temperature/heat wont work/dashboard lights on and off

It sounds to me like you're low on coolant. When you checked the coolant level, did you actually open the radiator cap and make sure the radiator is full? The plastic tank you generally add coolant too is actually an 'overflow' or 'reserve' tank. There is a hose that runs from that tank to the top of the radiator so if the radiator gets low on coolant, more coolant -should- run in from the overflow tank. However in practice this does not always work. I have a Jeep that leaks coolant and experiences this exact same problem. Coolant will not run from the reserve tank into the radiator because the hose is plugged up, and whenever the radiator gets low on coolant the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Posted on Feb 12, 2009

sparxxinct
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Posted on Feb 26, 2009

wracefans24
  • 1985 Answers

SOURCE: engine temp gage spikes to 260 degree when

are you sure the cooling fans are working?
Is the coolant temp gauge telling the truth?
have you lifted the hood and heard the coolant bubbling into the overflow?
Or heard the tinging sound of a red hot engine?
If he did a liquid test with the dye,and it changed colors it should have changed very fast,
Another thing to think about if he was to take the fan belt off,and pull the thermostat housing off,and removed the thermostat,Now pour coolant into the thermostat hole to almost the top,Now start the car and see which side the bubbles come from,left or right,that will be the gasket that is leaking not both.

Posted on Jan 24, 2010

woodchuck789
  • 4059 Answers

SOURCE: Recently we flushed the cooling system in my 2005

Sounds like the thermostat needs replacing. Doesn't seem to be opening all the way. You can check it by putting it in a pot of hot water and watch to see if it opens all the way.

Posted on Jan 21, 2011

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are you sure the cooling fans are working?
Is the coolant temp gauge telling the truth?
have you lifted the hood and heard the coolant bubbling into the overflow?
Or heard the tinging sound of a red hot engine?
If he did a liquid test with the dye,and it changed colors it should have changed very fast,
Another thing to think about if he was to take the fan belt off,and pull the thermostat housing off,and removed the thermostat,Now pour coolant into the thermostat hole to almost the top,Now start the car and see which side the bubbles come from,left or right,that will be the gasket that is leaking not both.

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