TM 9-2320-386-10 2-80 Change 1 2-32. OPERATION IN EXTREME COLD (Contd) (1) When temperature gauge (1) reads at least 150°F (66°C), shut off power plant heater (para. 2-43) and start engine (para. 2-13). NOTE If vehicle has been exposed to extreme cold before starting, notify your supervisor. Warm up control linkage, gearcases, and wheel hubs before placing vehicle in motion. (2) Check instrument readings. If any reading is not normal, stop engine. Report condition(s) to unit maintenance if operator troubleshooting (table 3-1) can- not correct malfunction. Normal instrument readings are: (a) Engine oil pressure gauge (5) should read 35-70 psi (241-483 kPa). (b) Air pressure gauges (3) should read 90-120 psi (586-827 kPa). (c) Voltmeter (4) should read in green area. (d) Engine coolant temperature gauge (1) should read 160°-230°F (71°-110°C). (e) Transmission temperature gauge (2) should read 160°-300°F (71°-149°C). (3) If vehicle is to be operated in ice or snow, perform para. 2-33a starting at step 3. 2 5 1 3 4