LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mercury >> 1983 >> Capri Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> THERMACTOR System >> Testing >> THERMACTOR Air Timer System
April 5, 2026: LEMON Manuals is launched! Read the announcement.

THERMACTOR Air Timer System

  1. With engine at normal operating temperature and battery fully charged, connect a vacuum gauge to bottom port of vacuum check valve and note if vacuum is present. Stop and restart engine. Measure time required for vacuum to be vented through solenoid. If 100-180 seconds, system is okay and test is complete.
  2. If less than 100 seconds, replace the timer. If more than 180 seconds, check vacuum and electrical connections as follows:
  3. Connect voltmeter between hot terminal of solenoid harness and ground. If no voltage, check B+ source to timer (not power relay). Repair as required. If voltage okay, disconnect I terminal lead on starter. Turn ignition to "START" for 3 seconds. Measure time for voltage to drop to 11.5 volts.
  4. If time is 100-180 seconds, replace vacuum solenoid valve. If time is more than 180 seconds, substitute another power relay and repeat test. If still more than 180 seconds, replace timer. If less, replace old power relay.
scientia non olet · About LEMON Manuals