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Recipe - Ram ProMaster 3.6L Pentastar V6 (2014-2025)

Specific Fix build

Reliability tier: aggregated - verify before ordering, see /disclosure/

Coolant loss on the 3.6 ProMaster: pressure-test and check the weep hole, the plastic thermostat housing and the coolant bottle in order, then replace what leaks (mode Cooling: water pump, thermostat housing and coolant bottle leaks).

Parts

• 3.6 Pentastar Thermostat Housing (68136754AA, includes thermostat) - thermostat housing with thermostat (68136754AA) (qty 1)
• 3.6 Pentastar Water Pump (68667064AA, current) - water pump (68667064AA, current) (qty 1)

Install order

1. pressure-test the system; inspect the weep hole, thermostat housing, coolant bottle and hoses in that order
2. check the coolant bottle for hairline cracks at the seams
3. replace the failed item; refill and bleed per procedure

Expected outcome

Level holds, no crust at the housing or weep hole, no overheat episodes.

Parts budget

About $75-$220 in parts. It depends on what the diagnosis finds; each option below is what you buy together. Prices marked "at Dave's" are Dave's Auto Center's, the same as in his store; the others are approximate prices from OEM and maker catalogs, rounded (a manufacturer's list price can run higher). Parts only, no labor.

• about $75: 3.6 Pentastar Thermostat Housing (68136754AA, includes thermostat) (about $75)
• about $220: 3.6 Pentastar Water Pump (68667064AA, current) (about $220)

DIY or shop: DIY or shop