Also i need to know where do i start to replace the tcc solenoid. Im working on a 01 Mercury Cougar V6 Dohc. Oh can anyone tell me where the speed sensor is located? Any help and info is appreciated!

SOURCE: water pump location on the 2.5L V6 engine 1999 cougar

It is located on top of the engine under the throttle body, it sucks, plan on a whole day if you are a good machanic.

SOURCE: 2002 Sunfire TCC Solenoid replacement

hi..the transaxle converter clutch . tcc. uses a solenoid -operated valve located in the automatic transaxle to mechanically couple the engine flywheel to the output shaft of the transmission through the torque converter.that reduces the slippage loss in the converter.reducing emissions.but check the vss first.which is called the vehicle speed sensor.they both work together .if the vss is not working right it wont call on the tcc.
check this out..
thank u..
rate me..

SOURCE: P0715 Input Speed Sensor Circuit A Malfunction

There is more than likely just a sensor that needs to be replaced, Either that or there is a problem with the wiring somewhere. How does the vehicle behave when shifting?

SOURCE: o2 sensors on a 99 mercury cougar v6

I just got done replacing the O2 sensors in my 99 Cougar due to throwing a P0135 malfunction code. There's 3. Facing the engine there's one in the front coming off of the front header, which is easy to get to. Another more tricky one if between the engine and the fire wall on the rear header pipe. The third is under the vehicle behind the transmission pan on top of the exhaust. In order to replace the O2 sensor near the fire wall you will need to remove the 4 retaining bolts for the ECM module and move it out of the way. Additionally you will need to remove the 2 retaining nuts for a wiring harness that is seated below the ECM module. Pay close attention to the connectors because the front and under vehicle O2 sensors have round connectors the one near the firewall has a squared connector. I was able to replace all 3 by myself in approximately 35 minutes. If your throwing a O2 heater malfunction code it is most likely going to be the sensor near the firewall. make sure that you know someone with a code reader so the code can be cleared. If you're do for an emmissions inspection be sure to put at least 40 miles on the new O2 sensor with different types of driving (e.g. highway, coasting, decellerated turns and rapid acceleration). Gotta love project cars for your kids!!

SOURCE: 2002 Kia Sedona XL suddenly downshifts

Start here:
www.kiatechinfo.com

Free registration, wealth of information.

For the record: if the sensors they're referring to are the input or output shaft speed sensors, they are very easy to find...just remove the air intake box (where the air filter is) and they're right there on top of the transmission. Input sensor is the one closer to the front of the vehicle, output towards the rear.