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Originally Posted by scottydl
- Heat does not work... clogged heater core? Related to high engine temp?
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Is there a heater-control valve that doesn't open? Are the heater hoses BOTH hot?
Quote:
Originally Posted by scottydl
- Vent selection doesn't work... I'm getting weak airflow from all vents, regardless of HVAC mode or fan speed. Blend door issue? Related to high engine temp?
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WILD GUESS with no evidence: Vacuum problem to the air door motors, also prevents the heater control valve from opening to allow coolant flow though the heater core.
But I don't know the vacuum system of your vehicle. I could be really wrong.
Generally, the air doors are set up so that if there's no vacuum, you have strong air flow out the defrosters.
One wonders if you have a plugged A/C evaporator, that's blocking air flow from the fan. Common for debris to get thrown off the fan blades into the evaporator--pine needles, leaves, etc.
Quote:
Originally Posted by scottydl
Coolant level in the radiator looks okay... spits a little out the overflow tube at times
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Consider installing an overflow bottle and a rad cap suitable for the closed cooling system...
...AFTER you figure out why it's overheating.