If this vehicle has a transmission cooler then it will have one line to the cooler then another for the return line to the transmission.
This is the coolant level idiot light, Mercury messed up when they designed this and the light goes on when the coolant is well within tolerance. You can either replace the sensor with a new one from ford that has been redesigned, or you can top off the coolant to just at the Max line, or to just a little above, that should turn the light off.
1. It's 14 years old. 2. It's perhaps the weakest link on that model Chev. The truck is known as a strong and reliable vehicle, but the transmission coolant lines often leak to one degree or another.
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This is one small problem with this generation Cougar, is that many of the low coolant sensors give false readings, saying that the tank is low when it is in fact, at the MAX line. To correct this, you can safely add coolant about .5"-1" above the MAX line without the reservoir overflowing when the engine get's hot.
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Return is the one that connects to the rear of the transmission.Return is the one that connects to the rear of the transmission.
The pressure line is the one closer to the front.The pressure line is the one closer to the front.
You will notice two lines going to your radiator from the transmission. One is a service line and one is a return line. The radiator has a transmission cooler built into it. If you have trans fluid in the radiator chances are the trans cooler is leaking. A little trans fluid in the radiator will not affect engine cooling BUT as soon as the pressure drops in that transmission you may very well have radiator coolant sucked into the tranmission and that will ruin a transmission in a hurry. You need to get this checked out as soon as possible.
Drain coolant, disconnect the battery. Disconnect the coolant line, replace the thermostat with a new one. Do not forget to replace the gasket too. Reconnect the line. Refill coolant, connect the battery.
Radiator is sectioned off--one section for antifreeze engine coolant the other is a chamber for transmission fluid to circulate and cooled. The chamber in your has ruptured allowing fluids to mix. You may as well considered the transmission to be "cooked" by now antifreeze has infilterated transmission and torque converter.
The line probably goes from the transmission to the radiator. The engine isn't involved in the process of cooling the transmission fluid. Replacement would be as simple as removing the old one and installing a new one.
99 Mercury Cougar has 4 mounts, one on passenger side connects to front of motor, one on driver side connects to back of transmission, one front of car bolts to motor and one connects from transmission to a brace at the bottom of the firewall.