No heat: replaced thermostat housing, thermostat, coolant sensor, now "check gauges" and screeching

[RMETeeJay]

Yes, loss of heat is new. It slowly decreased to now blowing cold air only. The radiator hose to the thermostat housing is engine temp and the to/from hoses for heater core are cool, not warm.

Sounds like a thermostat issue where it's either the wrong temperature specification (should be spec'd for 195) or it's staying open too far all the time. Do you remember what brand/model you used?

If you have an OBDII reader, the temperature shown should be averaging around 210 once it's fully warmed up.

 

[P man]

Did I miss the part where you checked the blend door function?

 

[RMETeeJay]

Did I miss the part where you checked the blend door function?

They said hoses to/from the core are cold.

 

[northwestTJ]

Did I miss the part where you checked the blend door function?

I did give it a looksie….it appears to open to cold air and just as cold air….I can feel the flow change so I’m thinking it’s opening from “hot” to “cold.” It’s on a cable…the hand adjuster in the dash cables the actuator….YouTube shows motored actuators

 

[northwestTJ]

They said hoses to/from the core are cold.

Indeed. At temp ~195* - 200* the to/from hoses to heater core are still cold.

 

[JKP]

That sounds like a plugged heater core. Remove the heater hoses from the core and try to run water from a hose through the core. Try both ways as the reverse way will backflush it.