The correct choice is a HOAT (Hybrid Organic Acid Technology) coolant, silicate-free and sold as a premixed 50/50 solution that meets FCA/Chrysler specifications. Mopar’s HOAT coolant is a reliable option, and many aftermarket brands offer compatible formulations. Do not use Dex-Cool or universal coolants unless the label explicitly states FCA/Chrysler compatibility.
Recommended coolant type
Key characteristics to look for when selecting coolant for your Compass:
- HOAT formulation (silicate-free)
- 50/50 premixed with distilled water
- Specifically labeled as compatible with FCA US LLC vehicles / Chrysler/Jeep products
- No Dex-Cool branding; avoid GM-type formulas unless clearly labeled compatible with FCA
- Color is not a reliable indicator of compatibility; always check the spec
Choosing a HOAT 50/50 coolant that meets FCA specifications will help ensure proper corrosion protection and reliable cooling for the Compass's 2.4L engine.
Compatibility notes
Always verify that the coolant explicitly states compatibility with FCA/Chrysler vehicles (sometimes listed as MS-9769 or an equivalent FCA specification). If in doubt, use the Mopar Antifreeze/Coolant Type 2 HOAT premixed product or ask a technician to confirm compatibility before mixing or refilling.
How to replace or top up coolant
When topping up or replacing coolant, follow these steps to avoid air pockets and ensure proper mixture:
- Ensure the engine is cool before opening the radiator cap; relieve any built-up pressure slowly if you must open it.
- Use a HOAT 50/50 premixed coolant labeled for FCA/Chrysler compatibility. Do not mix with non-compatible coolants.
- If starting with a concentrate, mix with distilled water according to the product instructions, then fill to the recommended level.
- Pour coolant into the reservoir or radiator until the level is in the full/cool range; avoid overfilling.
- Run the engine with the cap loose for a short period to purge air, then recheck the level once it cools and top up as needed. Check for leaks.
If you’re unsure about performing a coolant service yourself, have a qualified technician handle it to prevent air locks or improper mixing that can damage the cooling system.
Where to buy and how to verify compatibility
Choosing the right product largely comes down to labeling and official compatibility statements:
- Mopar Antifreeze/Coolant Type 2 HOAT premixed 50/50 (official Chrysler/Jeep option)
- Other reputable brands that explicitly state compatibility with FCA MS-9769 or Chrysler/Jeep vehicles on the label
- Avoid universal or non-specific formulas unless the manufacturer clearly lists FCA/Chrysler compatibility
Always read the label to confirm FCA compatibility and that the product is premixed 50/50. If you’re unsure, ask a parts counter specialist or a mechanic for guidance.
Summary
For a 2018 Jeep Compass, the safest bet is a silicate-free HOAT coolant in a premixed 50/50 solution that explicitly meets FCA/Chrysler specifications (such as Mopar HOAT or equivalent). Avoid Dex-Cool and non-approved universal formulas. Follow the owner’s manual for service intervals and consider professional installation if you’re not comfortable performing a coolant change yourself.