98 v6 mustang is over heating its not the thermostate or fan

Crank sensor, coil, ignition module, Or the distributor, If it has one. This for fire to the spark plugs. Being both were 98's. You could have purchased a bad engine. Check compression.

Is it over heating ? Hooking up a scan tool that can view sensor data to see what the PCM - engine computer see's as far as what the temp is . The PCM turns on the the fans . The fact that when you use the A/C an the fans come on ,tells me the PCM is controlling the fans .. The PCM will turn on the fans when engine temp.reaches 213 degress .

No have yours rebuild engine calibrate them different. Dealer catalog show there are different.

You need to change the "Coolant Temperature Sensor". That usually controls the fan. If the fan does not run, you will overheat.

Is it leaking? Are the fans running?

i do believe that has what the call a fan! controller computer thats located under the hood on the radiator support area looks like a big engine computer

Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.

sounds like overheating caused the head to warp blowing the headgasket ? there are always reasons this happens ? bad rad, waterpump,fans not working,thermostate, so be aware that after you repair headgasket to fix what caused it to blow or you will be doing it again ? god luck [email protected]

fuel problems try filter

fuel pump, regulator and filter need replacement.