Ford WSG-1068 — Cooling System Visual Test
Testing & diagnosis
For the Ford WSG-1068, from the Ford service manual.
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Before you start
- NEVER REMOVE THE PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR WHEN THE COOLING SYSTEM IS HOT.
Procedure
- Wrap a thick cloth around the pressure relief cap and turn it slowly one-half turn counterclockwise.
- When pressure is released, turn counterclockwise and remove the pressure relief cap.
- Inspect coolant in radiator and degas bottle for color: clear light green or blue means higher water content; dark brown indicates stop leak; light or reddish-brown indicates rust; iridescent sheen in
- If appearance is good, test coolant range with battery and antifreeze tester: maximum ratio 60/40, minimum ratio 45/55.
- Check coolant system conditions and adjust mixture as needed.
- Check for electrical charge in coolant using a DVOM: less than 1.5 volts is good; above 1.5 volts drain, flush and replace coolant with 50/50 mixture.
Tools required
- Battery/Anti-Freeze Tester 014-R1060 or equivalent Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Maximum ratio 60/40
- Minimum ratio 45/55
- Less than 1.5 volts is good
- Above 3 volts may indicate a bad head gasket
Source: Ford service 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.