Question about 1998 GMC Sonoma
The heater does not blow hot air. Occasionally it might blow lukewarm but never hot. The air direction switch works fine as does the fan. Just no heat.
Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.
Posted on Dec 22, 2008
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Posted on Jan 02, 2017
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