Question about 2002 Pontiac Grand Am

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Replaced coolant sensor and thermostat. over heated twice.

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Make sure you got all of the air bubbles out of the system. also could be a leak from the system or a bad radiator cap. need to presure test the system for this.

Posted on Oct 08, 2009


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2008 f350 6.4 liter wrench light on reduced engine power on no codes water pump and housing replaced thermostats replaced coolant flushed twice oil coolers free flowing lights are still on any sugesti

Have the codes read. I haven't worked on any thing to date that reduce power because of the coolant system or the oil. I have done some that will kill the engine because of both, but not reduced power. This could be from an engine hard part, sensor or wiring. Most times it's caused from a transmission problem.

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1996 740 electronic temperature control.check engine light on all the time .replaced thermostat twice same code again how do you fix that Thanks Yvon

The coolant temperature sensor may cause the light to come on. when the sensor fails the engine is slow to start and there is a strong odor of gasoline. turn it off and it starts normal the second time.

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Fix an overheating buick rendezvous 2002. Truly overheated once, then had the radiator flushed and replaced, along with thermostat (twice) and water pump. Now, the computer indicates it is overheating

You have a needle in a haystack because so many things can cause your problem. I am leaning toward the main computer - which you can replace yourself for around $300. There are companies on the internet that will send you your pre-programmed computer, you have to supply your VIN number. Like many internet companies I always recommend that you are careful in your selection. Be careful to find a reliable company and call them on the phone to make sure they are a real company. If they do not have a phone number - find a different company.

Here are a couple things to try first:
1) Coolant sensor - but this usually makes your car run really poor because it can change the gas/air ratio. If your car is running great other than the overheating sensor - then this probably is not the problem. But worth checking.

2) Serpentine Belt - sometimes when you change the serpentine belt you can put it back on the pulleys out of order. Your car can run great but can cause overheating especially if you have the water pump turning backwards. Since you had the water pump changed you might just take a look at the belt to make sure it is wound correctly. There should be a sticker under the hood.

All said -- I am still leaning toward the main computer.

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If the coolant is actually warming up properly, it could be the coolant temperature sensor. Or, you may have a bubble in the cooling system. Or, you could have a bad intake air temp sensor.

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2002 honda civic over heats in traffic....i replaced radiator thermostat

ensure that your thermostat is facing in the proper direction. Since you've lost alot of coolant during the thermostat replacement, you are probably low on coolant. If you filled it up then you probably have air in the system. To get rid of the air in your system, remove the radiator cap, find a funnel that has a tight fit on the radiator where the cap was, add coolant ( if it is snugged it wont fall over or leak) as if you are trying to overfill it. fill it up to the point where the coolant is pooling in the funnel. then let the engine run and keep an eye on the coolant making sure it does not go dry. when the cooling fan cycles twice it should be good to go. if you cant find a funnel that will fit snuggly, just keep filling up the radiator with the engine running until the fan cycles twice.

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1 Answer

Why is it blinking?

My dear friend If the overheating you had is very high I personally believe that you might have a blown gasket or a cracked cylinder head, Since you said that you changed the thermostat and even twice and you still have problem also with lots of air bubbles, is showing you that you have compression in water coolant. what you will do before doing anything just when is cold remove the radiator cap and smell the coolant,if it smells fuel or burnt coolant surely you have to remove the cylinder head.The check engine light is blinking because you have a mechanical fault which is been effected since after the overheating,might be a melted temperature sensor,any injection failure etc.Please re check more carefully before you decide. Good luck and hope not to be something major.

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2005 3.3 caravan heater only provides heat off idle. Fan sometimes does not come on as well. thermostat was replaced twice in summer for O/H.

You probably have air pockets in your cooling system. I have fixed a few of them by removing the Coolant Temperature Sensor just behind the Thermostat Housing. They can be kind of hard to get to on 3.3L Engines. Anyway, remove the sensor and pour antifreeze into the radiator until antifreeze pours freely out of the sensor hole. Then re-install the sensor. You may have to top-off the radiator after the sensor is re-installed.

If this does not fix the problem the you could have a bad water pump. Sometimes the stamped-steel impeller on the water pump gets corroded to the point where it cannot circulate the coolant properly.

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1 Answer

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the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

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