General Motors — Cleaning Sea-Water Section of Heat Exchanger
Maintenance
From a General Motors owner's manual covering: Carb 5.7L, MP 5.0L, MP 5.7L, MP 6.0L. Check it applies to your exact model before use.
Procedure
- Remove the bolts securing the heat exchanger end plates; remove the end plates and gaskets.
- Clean the water passages in the heat exchanger by inserting a suitable-size wire brush into each passage; use compressed air to blow out loose particles.
- Clean the gasket surfaces; apply PerfectSeal to both sides of new gaskets; install the end plates and new gaskets.
- Install the bolts and tighten securely.
- Start the engine and inspect for leaks.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: General Motors owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.