1971 Lemans coolant boiling

Asked by Nov 04, 2016 at 07:13 PM about the 1971 Pontiac Le Mans

Question type: Maintenance & Repair

1971 Pontiac Lemans. Original 350, fresh build,
coolant in radiator is boiling.

3 Answers

250,815

Check the thermostat, might be stuck closed.

1 of 1 people found this helpful.
74,135

Make sure you have 50/50 coolant and water. Plain water boils at a much lower temperature. If this and Tom's advice does not work then check compression to make sure you don't have a leaking head gasket.

1 of 1 people found this helpful.
69,315

Also check your ignition timing. If it's retarded (late) it will cause the engine to run hot and possibly boil over when shut off. HTH. - Jim

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