Cooling System - RAM 1500 2025 Owner's Manual

314 SERVICING AND MAINTENANCE
To minimize the possibility of catalytic converter damage:
●
Do not interrupt the ignition when the transmission
is in gear and the vehicle is in motion.
●
Do not try to start the vehicle by pushing or towing
the vehicle.
●
Do not idle the engine with any ignition components
disconnected or removed, such as during diagnostic
testing, or for prolonged periods during very rough
idle or malfunctioning operating conditions.
C S
OOLING YSTEM
WARNING!
●
You or others can be badly burned by hot engine
coolant (antifreeze) or steam from your radiator.
If you see or hear steam coming from under the
hood, do not open the hood until the radiator has
had time to cool. Never open a cooling system
pressure cap when the radiator or coolant bottle is
hot.
●
Keep hands, tools, clothing, and jewelry away from
the radiator cooling fan when the hood is raised.
The fan starts automatically and may start at any
time, whether the engine is running or not.
●
When working near the radiator cooling fan,
disconnect the fan motor lead or turn the
ignition to the OFF mode. The fan is temperature
controlled and can start at any time the ignition is
in the ON mode.
Engine Coolant Checks
Check the engine coolant (antifreeze) protection every
12 months (before the onset of freezing weather, where
applicable). If the engine coolant is dirty or rusty in
appearance, the system should be drained, flushed
and refilled with fresh coolant. Check the front of
the A/C condenser (if equipped) or radiator for any
accumulation of bugs, leaves, etc. If dirty, clean by
gently spraying water from a garden hose vertically
down the face of the A/C condenser (if equipped) or
the back of the radiator core.
Check the engine cooling system hoses for brittle
rubber, cracking, tears, cuts and tightness of the
connection at the coolant recovery bottle and radiator.
Inspect the entire system for leaks.
DO NOT REMOVE THE COOLANT PRESSURE CAP WHEN
THE COOLING SYSTEM IS HOT.
Cooling System — Drain, Flush And Refill
NOTE:
Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could
lead to severe internal engine damage. If any coolant
is needed to be added to the system please contact an
authorized dealer.
If the engine coolant (antifreeze) is dirty or contains
visible sediment, have an authorized dealer clean and
flush with OAT coolant (conforming to MS.90032).
For the proper maintenance intervals
Selection Of Coolant

For further information page 351.
NOTE:
●
Mixing of engine coolant (antifreeze) other than
specified Organic Additive Technology (OAT) engine
coolant, may result in engine damage and may
decrease corrosion protection. OAT engine coolant
is different and should not be mixed with Hybrid
Organic Additive Technology (HOAT) engine coolant
or any "globally compatible" coolant. If a non-OAT
engine coolant is introduced into the cooling system
in an emergency, the cooling system will need to be
drained, flushed, and refilled with fresh OAT coolant
(conforming to MS.90032), by an authorized dealer
as soon as possible.
●
Do not use water alone or alcohol-based engine
coolant products. Do not use additional rust
inhibitors or anti-rust products, as they may not be
compatible with the radiator engine coolant and may
plug the radiator.
●
This vehicle has not been designed for use
with propylene glycol-based engine coolant. Use
of propylene glycol-based engine coolant is not
recommended.
●
Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could
lead to severe internal engine damage. If any coolant
is needed to be added to the system please contact
an authorized dealer.
Adding Coolant
Your vehicle has been built with an improved engine

page 299.
coolant (OAT coolant conforming to MS.90032) that
allows extended maintenance intervals. This engine
coolant (antifreeze) can be used up to 10 years or
150,000 miles (240,000 km) before replacement. To
prevent reducing this extended maintenance period,
it is important to use the same engine coolant (OAT
coolant conforming to MS.90032) throughout the life of
your vehicle.