Question about 1990 Toyota 4Runner

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Antifreeze leaking out of right side of engine but only when heater is turned on. doesnt leak otherwise, what could this be

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Most likely that sounds like is it the heater core that's gone bad. could be hearer core lines

answer antifreeze leak on driver side usually means either head gasket od a freeze plug leaking heater hoses generally go up passenger side .
f it appears to be coming from where the cylinder head meets the engine block, it is the head gasket. if it appears near the intake manifold and head, it is the intake gasket (or intake AND exhaust gasket on a straight six or chrysler slant six). if it is coming from the engine block it is a freeze plug. some v-6 and v-8 engines are common for springing coolant leaks at the intake gaskets. 

Posted on Feb 20, 2009

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Have a look for a heater control valve that may be leaking in area near firewall on passenger side, just follow your heater hoses.

Posted on Feb 20, 2009

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