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Draining/Flushing LT1 Coolant System

Old 08-15-2010, 02:52 AM
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92WhiteVetteGuy
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Default Draining/Flushing LT1 Coolant System

Hi,
I just finished replacing the WP on my 92 LT1 and want to flush the entire coolant system.
Where are the block drain plugs/knock sensors located? Are they accessible from the top or the bottom of the car?
Will they brake loose easily or is their a chance of breaking them off in the block?
Thanks,
92WhiteVetteGuy
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Old 08-15-2010, 09:30 AM
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tblt44
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well you do have most of it out already if you replaced the W/p.
Did you install a drain in the weep hole.
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Old 08-15-2010, 09:46 AM
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jaa1992
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Knock sensors are on both sides in the block.
On my 92 they have shields over them so the sensors aren't visible until you remove the shields.
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Old 08-15-2010, 09:56 AM
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STL94LT1
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You'll need to get under the car to remove the knock sensors, they're just above the oil pan on the block.
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Old 08-15-2010, 01:02 PM
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92WhiteVetteGuy
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Originally Posted by tblt44 View Post
well you do have most of it out already if you replaced the W/p.
Did you install a drain in the weep hole.
Will do with a drain hose.
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Old 08-15-2010, 02:24 PM
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tblt44
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I will take picks when I do mine,I will be working on it all week.
I think I'm gona wait till I get all new hoses before putting it back together.
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Old 08-16-2010, 12:11 PM
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Next time, remove your thermostat, open the radiator pitcock, then use a 6.0 hp (or higher) ShopVac with reverse thrust/blower capability and BLOW the air out using forced air.

You don't have to remove the knock sensors this way, plus it evacuates the entire system, heater core and all.
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Old 08-16-2010, 12:50 PM
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boonie c4
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Originally Posted by onedef92 View Post
Next time, remove your thermostat, open the radiator pitcock, then use a 6.0 hp (or higher) ShopVac with reverse thrust/blower capability and BLOW the air out using forced air.

You don't have to remove the knock sensors this way, plus it evacuates the entire system, heater core and all.
Been there done that + i agree %100
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Old 08-16-2010, 02:22 PM
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Originally Posted by boonie c4 View Post
Been there done that + i agree %100
Old Jedi mechanic's trick. Work smarter, not harder, I always say.
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Old 08-16-2010, 03:31 PM
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hooked073
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Hate to say this but the $5.00 flush kit they sell at parts stores dont work to bad. just tee the fitting in hook up water remove lower hose and let it run. not professional but removes a lot of crap
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Old 08-16-2010, 06:23 PM
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Originally Posted by hooked073 View Post
Hate to say this but the $5.00 flush kit they sell at parts stores dont work to bad. just tee the fitting in hook up water remove lower hose and let it run. not professional but removes a lot of crap
just make sure to burp the system when done.
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Old 08-17-2010, 10:22 AM
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Originally Posted by hooked073 View Post
Hate to say this but the $5.00 flush kit they sell at parts stores dont work to bad. just tee the fitting in hook up water remove lower hose and let it run. not professional but removes a lot of crap

No worries. I often use the flush kits to break up mineral deposits and other contaminants, PLUS the ShopVac technique. Still don't have to remove the knock sensors, just the thermostat.

I always like to inspect/test thermostats when I do cooling system flush-n-fills anyhow. Annual maintenance item.
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Old 10-09-2018, 10:27 AM
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Originally Posted by onedef92 View Post
Next time, remove your thermostat, open the radiator pitcock, then use a 6.0 hp (or higher) ShopVac with reverse thrust/blower capability and BLOW the air out using forced air.

You don't have to remove the knock sensors this way, plus it evacuates the entire system, heater core and all.
This sounds interesting, I would love to flush the coolant system without removing the knock sensors - is there a detailled sescription / video somewhere? I have both a strong ShopVac and a compressor, have an LT1 with unknown coolant in it that should not be re-used. I would like to flush in both directions, if possible.
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Old 10-31-2018, 05:18 PM
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Old 11-04-2018, 05:23 PM
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renhod
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where do u blow from. the t stat housing? rad cap? take t stat out and bolt housing back together?
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