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Dear Richard,
Good p.m. and may this find you well. Here are some questions to be answered:
(a) Is the vacuum hose to the heater control valve (between the engine and the firewall, slightly to the driver's side [US/Canada car] of center) attached to the valve, and if so, is the hose without holes, cracks, etc.
(b) Is the heater control valve in good working order?
If the vacuum hose has come loose (or is cracked) or the control valve has worn out, then it will not allow hot water to flow through the heater core.
The switch on the right side of the control module (marked in red only, or red-blue) selects the amount of heat (marked in red only) or heat/air con (red/blue markings).
If the A/C won't come on, and jumpering the pressostat (located on the accumulator, the can-like unit in front of the firewall, on the passenger side of the engine bay) activates the compressor, the problem is in the control module.
Specifically, the solder joints between the relay and/or the power connector - and the circuit board - have failed. This failure may be a break so small as not to be visible to the unaided eye.
See the FAQs (under FEATURES, above) for re-flowing the solder, to restore function. Only rosin core solder should be used (plumber's solder, acid core, will damage electrical/electronic devices).
Hope some of this helps.
Yours faithfully,
spook
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