Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPLYMOUTH1984HORIZON BASE, 1.6 AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 40 (ENGINE COOLING FAN)COOLING SYSTEM SERVICINGMAINTENANCECOOLING SYSTEM
1984 Plymouth Horizon Base, 1.6 A
Cooling System
1984 Plymouth Horizon Base, 1.6 ASECTION Cooling System
WARNING: This page does not describe the selected car, but rather 17 other vehicles, including the 1985 Plymouth Turismo, 1985 Plymouth Reliant, 1985 Plymouth Horizon, 1985 Plymouth Gran Fury, and 1985 Plymouth Caravelle. However, it is still accessible from the selected car via links, so may be relevant.
- With engine off, wipe radiator filler neck seat clean. Fill radiator to correct level. Attach tester to radiator and pump until pressure is at upper limit of radiator rating.
- If pressure drops, inspect for external leaks. If no leaks are apparent, detach tester and run engine until normal operating temperature is ontained. Reattach tester and observe. If pressure builds up immediately, a possible leak exists from a faulty head gasket or crack in head or block.CAUTION: Pressure may build up quickly. Release any excess pressure or cooling system damage may result.
- If there is no immediate pressure build up, pump tester to within system pressure range (or radiator cap). Vibration of gauge pointer indicates compression or combustion leak into cooling system. Isolate leak by shorting each spark plug wire to cylinder block. Gauge pointer should stop or decrease vibration when leaking cylinder is shorted.CAUTION: Do not disconnect spark plug wires while engine is operating, or operate engine with spark plug shorted for more than 1 minute as catalytic converter may be damaged.
- Remove engine and transmission (automatic only) oil dipsticks and check if water drops appear in oil. If so, a serious internal leak is indicated. If all checks are negative and system holds pressure for 2 minutes, there are no serious leaks in system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.