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| | | Forums66 Topics128,047 Posts1,055,622 Members48,426 | | Most Online14,466 Apr 26th, 2026 | | AD Chevy Trucks Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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on the Internet for over 30 years! and not clogged down with Ads! Again, thanks! | | | | Joined: Sep 2012 Posts: 13 New Guy | | New Guy Joined: Sep 2012 Posts: 13 | Simple question, Do I have to drain the coolant prior to pulling the temp probe. I assuming yes but I thought I'd ask. I bought a new probe/temp gauge and I was hoping to make a quick swap without draining coolant.
Any feedback is appreciated (even sarcasm lol) I'm working on a 54 truck with a 62 engine. Thanks in advance for your help
| | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | 1962 235/261 engine?
Where does the probe/sender enter the block? Near the top of the head? Does the sender/probe diameter match the hole in the head?
If yes, drain a quart of coolant (save it). Remove the old probe. Screw in the new probe. Pour in the coolant. Put the radiator cap back on. Start the engine and check around the probe/sender for leaks.
If I am incorrect, this will be corrected. | | | | | Joined: Sep 2012 Posts: 13 New Guy | | New Guy Joined: Sep 2012 Posts: 13 | Thanks, It is a 235 and the probe is at the rear of the block about half way down. Judging from the appearance the probe looks the same diameter as the current probe so I hoping for a easy out, easy in swap. (Now that jinks myself )
Thanks for the reply Rob
| | | | | Joined: Feb 2004 Posts: 29,764 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,764 | Drain about half a gallon of coolant, just enough to get the level below the temp sender height. No need to drain all of it. Save what you drained and pour it back in. Quick and easy! Run the engine with the radiator cap off long enough for the thermostat to open to be sure you don't have any trapped air, and top off as necessary. Jerry
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| | | | | Joined: Sep 2012 Posts: 13 New Guy | | New Guy Joined: Sep 2012 Posts: 13 | | | |
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