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160 degrees should be hot enough to get some heat. You could check the engine temp with a scanner to confirm. I would double check the blend doors, and the temp of the coolant in and out of the heater core. I use an inferred temp gun.
either of these manufactures are good just install one with the manufactures recommended temperature rating,as the wrong temp range can change how the car will run.example gas mileage,running temperature,cooling fan operation etc.
THERE IS NO HEATER CONTROL VALVE ON THE WATER HOSES. NEW HEATER CORE. INLET LINE right before heater core hot, outlet after core look warm. Burped cooling system 5 times with engine at operating temp. Installed homade burp VALVE right after heater core outlet(high part of hose). Still no heat. Removed water pump, impeller still in good shape not stripped off shaft. Removed heater core hoses flushed water thrue the connections on the block to the water pump INLET and outlet. flushed water thrue heater core and hoses. Going to put it back togeter today. Used known good gauge to check water temp for operating temp in test. 195 f
That's not really that unusual of a temp. 195-210 is a normal range. If you'd like, you may try installing a 195 degree t'stat. As well, make sure your cooling system, (radiator, heater hoses, and water passages in the block) are in good order. If this engine previously used the "orange" GM coolant, they were bad to clog up hoses and passages. I had to take all my hoses off, as well as water pump and thermostat and run pressure hose through all the orifices to get the gunk out.
Okay. warm up vehicle, get radiator hoses hot. Turn on heater, fan on low. Grip both rubber heater hoses close to the firewall, from the engine compartment side. They should be too hot to hold for long. If they are not hot, then you have a lack of coolant circulation to the heater hoses. If they are hot then access heater core, behind glove box area. Blend door which moves as you chose HOT or Cold, should be cable controlled, move the controls and be sure the door is actually moving. Keep me posted