How do you test a thermostat sending unit?
How to Test a Temperature Sending Unit
- Disconnect the connector from the coolant temperature sensor (temperature sending unit).
- Reconnect the connector to the sensor.
- Disconnect the connector from the sensor again.
- Determine the difference in the two readings.
Is the temp sending unit good or bad?
The original Sending unit appears to be bad. No readings from it Hot or Cold. The newer one gave me some screwy readings. At room temperature the new one shows 52 Ohms, at 210 degrees it shows 8 Ohms. It should go the other way. I wonder if this is a bad part or I have the wrong one of these as well. Have to go to Plan B now.
Where is the temp Guage and electic fan sending unit?
Installed the temp sender for gauge where the original one was installed on the driver’s side head. I also have A/C, so I installed a diode in the power lead to the fans to keep the current from “back flowing” to the relay when the A/C is turned on.
How big is a Chevy water temp sender?
You could also boil some water on the stove or microwave and drop it in for a few minutes, then test the resistance again. I remember from looking in the part store catalogs that a chevy water temp sender sould be around 80 Ohms at 100 Deg and 180 Ohms at 220 Deg.
Where is the temp sender and fan relay?
Switch in drivers side head, temp sender in the intake, however the fan still comes on when the ignition is turned on which makes me think either something is wrong with the temp switch or the relay. well i got the temp sender and the temp switch installed.
The original Sending unit appears to be bad. No readings from it Hot or Cold. The newer one gave me some screwy readings. At room temperature the new one shows 52 Ohms, at 210 degrees it shows 8 Ohms. It should go the other way. I wonder if this is a bad part or I have the wrong one of these as well. Have to go to Plan B now.
What are the senders for classic temperature gauges?
All Classic temperature gauges require the correct Sender Unit from Classic Instruments. Senders are available in standard threads as pictured at left: 1/2″ (A), 3/8″ (B), 1/4″ (C), and 1/8″ (D) NPT self-sealing tapered threads to fit most stock or aftermarket intake manifolds.
You could also boil some water on the stove or microwave and drop it in for a few minutes, then test the resistance again. I remember from looking in the part store catalogs that a chevy water temp sender sould be around 80 Ohms at 100 Deg and 180 Ohms at 220 Deg.
How does a temperature sending unit work?
The sending unit is a temperature-sensitive material that is part of a variable resistance, water-sealed unit that sits in the coolant stream in the engine. As the engine warms up the resistance in the sending unit is lowered gradually until the system reaches maximum heat.
https://www.youtube.com/watch?v=Qv_1auzWuVE
https://www.youtube.com/watch?v=HRPZUHuluQo