Sending unit in cylinder head - Chevelle Tech
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post #1 of 9 (permalink) Old Aug 6th, 19, 4:44 PM Thread Starter
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Sending unit in cylinder head

Hello, my aftermarket sending unit is inaccurate with my stock gauge because of the difference in resistances. I have the correct one now and I don’t want to make a mess with all the antifreeze in the block. What is the best way to put this sender in the head and catch some of the antifreeze? Take a drain plug off the block or let the radiator drain?

Last edited by LevonH; Aug 7th, 19 at 12:38 AM.
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post #2 of 9 (permalink) Old Aug 6th, 19, 5:37 PM
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Re: Sending unit in cylinder head

Draining through the block plug will drain the radiator to a certain extent.

Drain the radiator in a bucket, Then pull the thermostat. Be ready to install the new one to limit leakage. There should not be much.

Refill the radiator and restart the car with the cap off. You'll have to wait for the thermostat to open, then top off the radiator. When the thermostat opens, the coolant level will drop or you will see flow in the rad tank.
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post #3 of 9 (permalink) Old Aug 6th, 19, 5:39 PM Thread Starter
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Re: Sending unit in cylinder head

I appreciate your quick response, thanks !
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post #4 of 9 (permalink) Old Aug 6th, 19, 10:44 PM
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Re: Sending unit in cylinder head

Quote:
Originally Posted by DUTCH MAX HEADWORK View Post
Draining through the block plug will drain the radiator to a certain extent.

Drain the radiator in a bucket, Then pull the thermostat. Be ready to install the new one to limit leakage. There should not be much.

Refill the radiator and restart the car with the cap off. You'll have to wait for the thermostat to open, then top off the radiator. When the thermostat opens, the coolant level will drop or you will see flow in the rad tank.



He's asking about changing the temp sender!!

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post #5 of 9 (permalink) Old Aug 6th, 19, 10:51 PM
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Re: Sending unit in cylinder head

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Originally Posted by LeoP View Post
He's asking about changing the temp sender!!

Partially, the rest of the question was how to avoid having a coolant flood in his garage when he did so. I think draining the radiator might help him achieve his goals.

I guess I could have told him to pull a constant vacuum on the radiator to avoid coolant loss, but I figured he didn't have the means to do so.
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post #6 of 9 (permalink) Old Aug 6th, 19, 11:43 PM
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Re: Sending unit in cylinder head

no need to pull the thermostat, just drain the radiator some.

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post #7 of 9 (permalink) Old Aug 6th, 19, 11:53 PM
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Re: Sending unit in cylinder head

Quote:
Originally Posted by LeoP View Post
no need to pull the thermostat, just drain the radiator some.
My bad, I see where you're coming from now. I meant to pull the sender, not the thermostat. Hope he didn't pull the thermostat.
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post #8 of 9 (permalink) Old Aug 7th, 19, 11:07 AM
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Re: Sending unit in cylinder head

Would not be a bad idea to pull the stat for filling the block back up to avoid air in the system.
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post #9 of 9 (permalink) Old Aug 7th, 19, 11:58 PM
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Re: Sending unit in cylinder head

Don't have to drain that much to change the temp sender!
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