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Issue:

Some vehicles may exhibit repeat heater core leaks. This may be caused by a chemical reaction called electrolysis. Electrolysis involves an ion exchange between the heater core and engine coolant which can result in a breakdown of the heater core material. This is similar to the operation of a battery.

Action:
1. To check for electrolysis use a voltage meter set on DC volts. Place the pos (+) probe in the engine coolant and the neg (-) on the neg battery post.

2. Adjust throttle to 2000 RPM to get the flow going and true electrolysis voltages.

3. If more then .4V is seen, flush the coolant and recheck.

4. If there is still excessive voltage present, check the body/battery grounds. Also, verify proper grounding of aftermarket stuff that has been installed.

5. If the condition is still present after the grounds have been checked, it may be necessary to add extra grounds to the HEATER CORE and engine. I replaced the weak engine grounds with thick SS straps from Summit on each side of the motor. A hose clamp can be used to secure a 16 AWG stranded copper wire to the heater core inlet tube. The other end should be secured to an EXISTING FASTENER on the body sheet metal. Extra grounds should be attached between existing fasteners on the engine and body sheet metal. Verify continuity of any added grounds to the neg (-) batt terminal.

6. If the condition is STILL present, add a restrictor (PN F1UZ-18D406-A) on the inlet hose with the arrow facing the direction of coolant flow (toward heater core). Cut the line and install it as close to the engine as possible (not near the heater core itself).
 
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