at first only had air coming out of defrost.blend door actuator was bad replaced it now it works.did not solve the problem.a mechanic named pushrod on this site sent a youtube link watched a video rerouted vacuum line all vents work as they should now.did not solve the problem.replaced thermostat.did not solve the problem.back flushed heater core.did not solve the problem.still no heat.plenty of air at vents. went to to auto parts stores both said should be a valve on one of the heater hoses that should open and close to let hot water flow i dont find any such valve.
Hello,
First, it's important to determine that the engine has reached a properly hot operating temperature. Yes, the thermostat was replaced, but have you been able to measure engine temperature? A diagnostic tool that is able to monitor data will share the engine temperature.
If the engine temperature is north of 195 degrees -- over 200 degrees when warmed up -- then coolant heat shouldn't be a problem in supplying heat to the heater core.
Ensure the engine has enough coolant in it. Low coolant can affect having heat generated in the vehicle.
A clogged heater core can be an issue as well.
As far as a valve being present -- the repair manual indicates a heater control valve, but I'm not sure of the function or location based on the reference material I looked at.
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