TM10-3930-660-20 Table  2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION b. If oil is present in the coolant, check for a transmission or lube oil cooler leak. Step 2. Check  for  overheating  or  leaking  compression  gasses  causing  loss  Of coolant through the radiator overflow. Review the operation for overheating and low power. Refer to Test 21, Coolant Temperature Above Normal, in this table (Table 2-3). Step 3. Check  for  transmission  cooler  and  transmission  cooler  lines  leaks. Test combination radiator/transmission oil cooler, and if necessary, replace, para. 7-3. 24. CONTAMINATED   COOLANT Check for rusty coolant, operation without correct mixture of antifreeze and coolant. Review the coolant change interval. Replace coolant if necessary, para 7-3. 25. LOW TORQUE CONVERTER  OUT  PRESSURE Step 1. Check for low transmission oil level. Add oil as necessary, LO10-3930-660-12. Step 2. Check for leakage in transmission oil cooler and cooler lines. a. Replace cooler lines as necessary, para. 7-3. b. Replace combination radiator/transmission cooler if necessary, para. 7-3. Step 3. Check for high transmission oil temperature. Refer to Test 26, High Transmission Oil Temperature, in this table (Table 2-3) . Step 4. Check for foaming transmission oil. Refer to Test 29, Loss of Power, in this table. 2-39