Warning signs your engine is overheating

Ram's 2026 owner's manual lists the first four of these potential signs of overheating; its warning-light section adds the fifth:

• The temperature gauge is at HOT (H).
• A strong smell of coolant.
• White smoke coming from the engine or exhaust.
• Bubbles in the coolant in the coolant bottle.
• The engine coolant temperature warning light comes on with a chime. If the temperature reaches the upper limit, a continuous chime sounds.

From the 2026 Ram 1500 Owner's Manual (If Your Engine Overheats; Engine Coolant Temperature Warning Light), read November 3, 2026. Gauges and warnings differ by vehicle; check your owner's manual.

What to do when the temperature gauge climbs

If the gauge is moving toward HOT but has not reached it, Ram's manual suggests these steps to reduce the potential for overheating:

• On the highway, slow down.
• In city traffic, while stopped, shift into NEUTRAL, but do not raise the engine idle speed while holding the vehicle with the brakes.
• Turn the air conditioning off. The A/C adds heat to the engine cooling system.
• Turn the temperature control to maximum heat, the mode to floor and the blower to high. The heater core then acts as a supplement to the radiator.

If the gauge reads HOT, pull over and stop. Idle the vehicle with the A/C off until the pointer drops back into the normal range. If it stays on HOT and you hear continuous chimes, turn the engine off immediately and call for service. Ram warns that driving with a hot cooling system could damage the vehicle.

From the 2026 Ram 1500 Owner's Manual (If Your Engine Overheats), read November 3, 2026.

What not to do

Hot coolant and steam can cause serious burns. The manual is clear on these points:

• Do not open the hood if you see or hear steam coming from under it; wait until the radiator has had time to cool.
• Never open the cooling system pressure cap when the radiator or coolant bottle is hot, and do not loosen or remove it to cool an overheated engine. Heat builds pressure in the system.
• Never add coolant when the engine is overheated.
• Keep hands, tools, clothing and jewelry away from the radiator cooling fan when the hood is raised. It is temperature controlled and can start at any time, whether the engine is running or not.

From the 2026 Ram 1500 Owner's Manual (If Your Engine Overheats; Cooling System), read November 3, 2026.

Common causes of overheating

These are the cooling-system checks Ram's manual describes. Each one points to a way the system can lose its ability to shed heat.

From the 2026 Ram 1500 Owner's Manual (Cooling System; Periodic Safety Checks), read November 3, 2026. Only an inspection can confirm the cause on your car.

When steam is normal

Not every wisp of vapor means trouble. Ram's manual notes that when you stop after a few miles of driving, you may see vapor coming from the front of the engine compartment. That is normally moisture from rain, snow or high humidity on the radiator being vaporized when the thermostat opens and lets hot coolant into the radiator. If there is no sign of radiator or hose leaks, the vehicle may be safely driven and the vapor will soon go away.

A temperature gauge at HOT, a coolant smell, bubbling in the coolant bottle or continuous steam is different and should be checked.

From the 2026 Ram 1500 Owner's Manual (Cooling System Notes), read November 3, 2026.

Help prevent overheating

Simple checks from the owner's manual:

• Check the coolant level in the coolant bottle with the engine cold. It should be between the MIN and MAX marks. For its 3.6L engine, Ram says checking once a month is enough as long as the engine temperature is normal. Do not overfill.
• Have the coolant's freeze protection checked every 12 months, before freezing weather.
• Clear bugs and leaves from the front of the radiator and A/C condenser.
• Look over the hoses for brittle rubber, cracks, tears and cuts, and watch for leaks under the car.
• Use only the coolant type your owner's manual specifies. Some vehicles need special tools to add coolant properly, so if yours is low and you are unsure, have it serviced.
• Follow the coolant replacement interval in your manual. For the 2026 Ram 1500 it is 10 years or 150,000 miles, whichever comes first.

For other basic under-hood checks, see our guide on how to check engine oil and our car maintenance schedule basics.

From the 2026 Ram 1500 Owner's Manual (Cooling System; Maintenance Plan), read November 3, 2026. Intervals and coolant types differ by vehicle.

Cooling system service at Elgin Auto Sales & Service Center

We service all makes and models. If your car is running hot, bring it in and we can check the cooling system to find the cause.

Our service department at 1200 E. Chicago St. in Elgin is open Monday to Friday 8 a.m. to 5 p.m. and Saturday 8 a.m. to 4 p.m., and is closed Sunday. Schedule service, see our service specials or get directions.