The temp gage goes almost to the red. i dont use the ac. the coolent is green like it is brand new. i checked the oil cap for signs of of a blown head gasket and it looks and smells fine.what happens when the thermometer goes bad?
Try replacing your thermostat. I haven't had to replace one in years, but I remember it being a cheap and easy job. It should be located where your upper radiator hose meets the engine. You should only need a screwdriver to loosen the hose clamp and the same screwdriver to pry the old thermostat out. Be sure to let the engine cool off first!!!
This link explains how they work. http://auto.howstuffworks.com/question248.htm
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Sometimes when you open cooling system, air gets in, it can cause problems with temp gage.
How hot does it get in degrees F? Is the coolant boiling over? Are you losing coolant? Use a non-contact infra red temp gun to take engine temp, At least we will have a degrees F reading. Most temp gages say hi or lo, cold or hot. I don't know about yours?
Can you check for combustion gases in the coolant?
the most obvious cause is the head gasket ,its failing and drawing in the water so no problems with overheating or pressuring the system ,never mind the weekend mechanics who know more with the amount of beer they drink ,its failing as most gaskets will around the 100,000 mile mark regardless of make or model
check that you have a thermal switch to switch on the fan and not a temp sender unit. One completes the curcuit when a set temp is reached ,the other is a resistance unit that lowers the voltage which in turn reads hotter on the gauge.
Your radiator cooling fan will only come on when the engine temp has reached the point where it needs to have air forced through the radiator and thus bring engine heat back down to safe operating range. If your heater is not working check to make sure the fresh air vents aren't stuck open (are the controls stiff or not going all the way across?) check also that the heater shutoff valve lever which is usually situated on the firewall at the rear of the engine and can be found easily by tracing the hoses back from the thermostat housing aren't bent and/or seized up.
both fans should be running if your temp light is on or if the temp. gauge is reading hott thats the problem you may have a bad relay or fuse. so while your home or some where you can check it. drive it around the block and back with the car running raise the hood and see whitch fan is not turning then shutt off car and make sure the belts are in good condition and tight enough. if all is well both fans are turning. it could be your thermostat has gone bad just because its new dosent mean it works [same with water pump] and was the radiator flushed out when you had this work done? gunk builds up and that causes pumps and thermostats to go bad. or maby a temp.. relay.. i know im throwing alot of stuff at you but first check the fans make sure they are turning. then move on.. to the next, just trying to give you all the things i would check. now if you find something wrong and want to replace yourself go to youtube and search videos on replacing what you have found wrong too see if its something you want to tackell yourself. remember to keep all recepts for new items they may be under warrenty.[ NEVER WORK ON A HOTT CAR MAKE SURE ITS COMPLETLEY COOLED DOWN} radiator fluid will stay hot enough to burn you for hours.get what you need the day befor working on it and start in the morning next day when its completly cool. dont mix radiator coolent if green come out green goes back in if orange comes out orange goes in i hope this info helps you out it. has to be one of the things ive mentioned.. good luck
Check the sensor which controls the cooling fans that cools the radiator it prevents the engine from over heating and allows the temp gauge to stay at normal range.recently had problems with my 2003 impala overheating it was the sensor had the thermostat replace as well.
Check for coolant in the oil. The oil will look like chocolate milk. After it's sat overnight you can also try loosening your oil drain plug until fluid comes out. See if it looks like chocolate milk or is just straight coolant. Check your spark plugs. Pull them out of the cylinder head and check for white corrosion or actual coolant in chambers or threads. You can also do a block test (rent the block tester at Autozone for $25.00- return when you're done and you get the $25.00 back) the block test fluid is $8.99. Follow the directions and if your test fluid turns green or yellow you have combustion/emission gases in the coolant. This can be caused by a cracked block/ cylinder head/ blown head gasket. You can also disconnect one head's spark plugs and test that cylinder then the other to see if only one is causing the problem. Hope this helps. If you're losing coolant, it's probably not your water pump. A lot of times if a head gasket fails, the head (usually made from Aluminum) will crack or warp.