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I'm going to address this as if your flaps are OK and not part of the
problem. The volvo heater core is actually a split design that sends
heat to each side then the coolant flows up the middle to the outlet and
back to the engine. This way each side gets heat and the middle is cool
air to cool the resistor for the heater fan speeds. Where the hot inlet
heater hose attaches you will see the metal pipe split and go to each side
if one of the smaller pipes clog then you can have heat on one side and
not the other.
However, there is another possibility that also has to do with the heater
core. If someone replaced the heater core and did not use a genuine volvo
one, then this may be your problem. The aftermarket heater cores have the
coolant come in one side and out the other like most other cars. If you
have this type then one side will be hot and the other side cold. I know
because when I had my 79 I installed one of these and regretted it from the
day I turned on my heat. You can see the heater core pipes by looking at
the top of the heater unit. You can clearly see the inlet pipe split into
two small pipes that enter the core on both sides. If you only see on
metal pipe in and one out then you have an aftermarket core.
Hope this helps. By the way I have to do my blower motor this weekend.
Dave 82 242ti
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