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Old 02-03-2011, 03:25 AM
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Join Date: Jul 2006
Posts: 174
Exclamation faulty water pump? heater... 1987 420sel

when i drive my baby (1987 420sel) the heat does not come on right away....

so, initially changed the blower and the porcupine...then i got airflow

now, there is a switch next to the rear defrost (i think it is for recirculated air) that goes click click click along with a red light indicator....when this happens it cuts off the airflow .....

does this sound like anything anyone else has seen? if so, would a faulty water pump be the culprit....

lyle in texas

ps. welcome back phil....guess retirement got boring....
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Old 02-03-2011, 09:12 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
More likely culprit is the heater valve (mono heater valve).
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