My 2005 grand prix fans wernt working the other day so my engine almost overheated...my boyfriend fixed it so now my fans work but im still not sure where my tempature gage should be.

see if the fan is working should come on with the ac on

You should look under the car after it sits a while and see if there is antifreeze on the ground. If so try to see where it could be leaking under the hood directly over the puddle. You could have a leaking water pump. If so there would be dampness under the right side of engine compartment. Also check the radiator hoses at front of car.

CHECK COOLING FANS FUSE AND RELAYS.IF ALL IS GOOD PROBLEM COULD BE FAULTY COOLANT TEMPERATURE SENSOR OR FAULTY PCM OR FAULTY FAN WIRING.

most a/c fans are usually located into the a/c heater box assembly most vehicles are inside behind the glove box area some are in the engine compartment at the firewall .generally not to bad to fit.regards agwbk

Are the cooling fans coming on during normal operation? If your ac works turn it on and see if it overheats with ac on.If it does not overheat the fans are not operating properly under normal operating conditions.The ac will force the fans on. What you can do to start is just let the car idle in park and see if fans will come on normally. The coolant temp should reach 200-210 before the fans will come on. Make sure the air is off at this time. If we can verify the fans are working or not working properly we can go to the next step. Let me know what you find out.

Most likely it is a combination problem involving the water pump. The temp sensor being slow to respond being the problem would be easily identified. If the vehicle is over heating when you are moving and 30 to 40 mph it is not a sensor or Fan. It could possibly still be the fan if the fan clutches are not working and allowing it to free spin as air moves faster through the Radiator but this is less likely than a bad water pump.

The price of the water pump depends on which engine you have in your car. There are three different size engines for a 2005 grand prix. If your not going to do the work yourself, I cant give you an acurate quote as all mechanics charge differently. You'll just have to go to differend mechanics and get some quotes.

CHANGE THERMOSTAT.MOST OF THE TIME THERMOSTAT WILL CAUSE OVERHEATING.CHECK YOUR COOLANT MAKE SURE ITS NOT LOW.HAVE COOLANT FANS CHECK TOO SEE IF THEY TURNING ON.GET A DIAGNOSTIC SCANNER HOOK UP TO CHECK FOR COOLANT TEMPERATURE SENSOR FAULT AND FAN RELAY AND FAN FAULT. MAKE SURE FAN FUSE IS GOOD.

sounds like you have a air pocket in your system. the shop you had the work done at should know how to fix

Get another boyfriend! "Just kidding"! ok, this is what I mean about "leaving it to the experts". #1 Make sure there is enough coolant, Check for leaks. Install a coolant pressure tester and check for leaks. Fix whats leaking. #2 Make sure coolant fans are coming on, and specifically at 220 degrees. If not, check fuses. Jump the coolant fan to make sure it comes on. if it does, then you may have a bad relay, make sure relay is commanded on. At this point , you may need a wire schematic for the coolant fans and related parts.