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Coolant, vacuum, and electrical work were completed this afternoon. I temporarily re-wired my foglamp switch to control the vacuum solenoid to open and close the 4-way heater valve.
Initial observations:
Outside temperature: 78 F
Intake air temp with no heat: 90 F
Intake air temp with heat: 115 F
When switched on, the air temperature takes about 30 seconds to stabilize at the higher value. When switched off, the air temperature takes several minutes to stabilize at the lower value.
I think that's a good start, considering that the intake heater only covers about 70% of the air filter area. Air is free to flow around the remaining 30% uncovered area, without getting heated. Fuel economy observations will be conducted during the next run.
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