Intermittent Heat

'81 300TD Turbo. Changed climate control unit and heat started working. Couple of days later no heat again. I'm hearing a light hissing sound and suspect a leak. Where would be the most likely place to start looking based
on the no heat problem and the hissing?
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I would check your servo unit... that big blocky thing with heater hoses attached to it... common problem.
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Would this be the beast behind the glove box that has the actuator attached to the door on the top and the fan in the bottom?

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No... in the hood.
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Ahhhhhh Ok, thanks.

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