If you’re losing coolant but haven’t noticed a leak, a damaged Cylinder Head could be the cause. If this is fine, check for vacuum leaks in the Inlet Manifolds. These can cause rough idling and stalling while leaking coolant, due to worn gaskets and poor sealing, which can cause the engine to seize. Minor issues are often solved by replacing Gaskets or bolts, but more excessive wear or damage often means replacing the manifold. The same goes for Camshafts. Negligible wear is solved with a range of Camshaft Parts such as repair sleeves.
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