Hi,

I had my front oxygen sensor replaced on my GS recently. I notice that it is getting very very hot under the hood. ( I havent checked the temperatures before replacing the oxygen sensor). It is specifically very hot around the coolant intake to the radiator and the exhaust manifold where the oxygen sensor sits. It is so hot just after driving 1 mile that I can not even touch the coolant intake to radiator. The rest of the engine compartment is also getting very hot that I can barely touch the coolant reserviour cap. I fear that the plastic is going to melt due to this heat. The temperature guage inside the car reads normal. I noticed that the radiator fan is not working when I open the hood after driving 5 miles. Is this normal behaviour or something went wrong when replacing the oxygen sensor? Please advice.

Thanks in advance for all the suggestions.

you need to get those radiator fans checked

Do you know appx how hot you're running?

Check your coolant level 1st then turn the a/c on and see if the fans come on. If they do turn the a/c off and let the engine warm up and see if the fan comes on when both radiator hoses feel about the same temperature. With the hood closed everything under the hood will get very hot to the touch and as long as your coolant in the radiator and overflow bottle are full and the temp guage is normal it is safe to say the condition your havingis normal.

Thanks for the replies. I got the temperature checked by a laser gun. The temperatures read close to 170 degress (F) after driving nearly 15 miles. I was told that this a normal range of the temperature under hood. The radiator does turn on when I turn the AC on. The coolant in the overflow bottle is full. If 170 degrees is not in the normal expected temperature range, please let me know.

Thanks again,