No Heat in SC400
11-28-14, 11:36 PM
#17
Assuming the heater control valve is the problem, it'll likely work.
An easy way to confirm if the HCV is working is to look at the bottom of the actuator from the passenger fender (at fender level) and look at what the rod and pivot arm are doing. Fully extended is max cooling, fully retracted is max heating. I've got pictures of it here. No heat probably means the actuator isn't pulling the rod in to open up the tumbler in the valve and allow coolant through. My problem was the opposite: it wouldn't extend fully, leaving a small passage for the coolant to pass through and heat up the cold air.
An easy way to confirm if the HCV is working is to look at the bottom of the actuator from the passenger fender (at fender level) and look at what the rod and pivot arm are doing. Fully extended is max cooling, fully retracted is max heating. I've got pictures of it here. No heat probably means the actuator isn't pulling the rod in to open up the tumbler in the valve and allow coolant through. My problem was the opposite: it wouldn't extend fully, leaving a small passage for the coolant to pass through and heat up the cold air.
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