A failed digital heater control valve can cause a lack of heat output from the climate control system.
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This is a small cheap part that costs about $100 to replace. Try this - under the hood, on the left side of the vehicle (as you look forwards) there's a plastic cover over the bulkhead behind the brake reservoir. Give it a healthy slap. Try your heater.
Climate control blows cold air only no hot air
My heater is blowing no heat just cool air...
Cool Air but no hot air coming out.
heater does not blow hot air only cold air
no heat from heater
had to change control system entirely.