After driving for some time i stopped and continued to idle i found that my temperature gauge started too rise to the last line on my gauge so i turned my heater on high and my temperature gauge started too go down? When i start my car the fan doesnt come on?
2007-03-18 14:36:52 · 5 answers · asked by . .Ovechkin 1 in Cars & Transportation ➔ Maintenance & Repairs
This is a problem that will require a professional. The fan is supposed to come on when it reaches about 190 to 225 degrees. There are several possibilities for why this is happening. First, the fan motor could be faulty. The cooling fan relay may be faulty. There could be an open circuit to power or ground of the fan, relay or powertrain control module. The powertrain control module may be faulty, and the engine coolant temperature sensor may be inoperative or out of its correct range. For these reasons I recommend taking the vehicle to a repair facility. There is also a possibility of a bigger problem that will prevent the car from cooling properly even if this symptom is taken care of and that is a blown head gasket. If this occurs the super hot gas in the combustion chamber will come into contact with the coolant and instantly vaporize it, and this will make the vehicle overheat until the pistons weld themselves to the cylinder wall. I recommend having the vehicle towed to avoid any further damage and have it completely evaluated electrically as well as for leaks, hydrocarbons in the coolant (which is how it is tested for a blown head gasket), conditions of hoses, leaking heater core and radiator, cap holding pressure (important for raising the boiling temperature of the coolant as well as preventing cavitation, which is when air bubbles are formed by the movement of the impeller in the waterpump and explode which actually flakes off pieces of metal and typically causes leaks and destroys the waterpump seal), and for the temperature at which the cooling fan is working properly by applying direct power to it. If the fan works with power, then you have to work backwards with electrical testing to determine why it is not being controlled on.
2007-03-18 14:50:43 · answer #1 · answered by Mtech 3 · 0⤊ 0⤋
The fan should kick on at about 200 degrees. Most OE thermostats are 220's which means the t-stat actually starts to open at about 190. The Temp sensor is a thermal sensor close to the t-stat. When the hot water heets this sensor, it in turn signals a relay, which turns on the fan. If it's not coming on, try turning the ac on. I believe your mustang only has the one fan, if it does, when the ac is turned on, the fan should come on. If it does, then you know the electrical portion of the fan is decent. Start to question the temp sensor or T-stat. Test the t-stat by letting the car warm up, gauge at least halfway, and touch the radiator hoses. If one is hot and the other cool...then the t-stat is not functioning correctly, thus overheating the engine. You might consider having the coolant flushed also.
2007-03-18 21:49:38 · answer #2 · answered by wrenchheadk 1 · 0⤊ 0⤋
My 1990 Mustang has a mechanical fan, but it's a 5.0 Your fan should be a mechanical fan too therefore coming on when the car is started. If it doesn't turn over then you probably have a bad fan clutch. See if the fan will turn by hand when the car is off.
2007-03-18 22:13:20 · answer #3 · answered by Jeremy G 4 · 0⤊ 0⤋
You need to check the coolant temp sensor, it turns your fan on and off. Also check the fuses, the one for the fan may be blown. To check your fan disconnect it at the fan and run a wire from the positive post to one of the pins at the fan. Then take another wire ground it and touch the other pin. That will tell you if the fan is working. If the car came with a fan on the engine then you will need to replace the fan clutch.
2007-03-18 21:56:32 · answer #4 · answered by JENELLE B 2 · 0⤊ 1⤋
sounds like wrenchhe nailed it.
2007-03-18 21:49:51 · answer #5 · answered by boostnutt 3 · 0⤊ 0⤋