Hey forum,
1993 Honda Civic LX 4dr 1.5 Auto
I have a problem. Here it is.

I have very good Heat!!!!
NEW thermostat
NEW Sensor that goes into the thermostat housing (I think temp switch)
Professional at shop cooling system flush

Engine is not heating up to normal temp
Upper Hose to Block gets hot
Lower hose to thermostat housing is Cool or cold.

Please help
Thanks

 

Could be working normally except the gauge doesn't work.

Locate the temperature sender screwed into the head beneath the distributor. It is the smaller one toward the back of the car, with one wire. First, is the wire plugged in securely?

If so, proceed to the next test where you'd unplug the wire and ground it. Then turn the key on and the gauge should go all the way up to hot.

If that works, check the resistance of the sender with the engine apparently warmed up. Should be about 80 ohms more or less. Or finding the gauge working, just replace it.

 

I will try that but would that explain why the upper hose gets hot and the lower one is cold/a little warm though?
I don't get this at all.

 

Water flows from top to bottom thru the radiator. So it goes in hot and comes out cold.

The switch on the thermostat housing is sensing the temperature of the water leaving the radiator / about to enter the engine. When the radiator is unable to reject enough heat (due to no air flow), the water in the lower hose starts to get hot. This activates the fan.