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exhaust gases in coolant


winterset

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Na, it was more like listening to wallpaper crack, :lol:

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Had an opportunity to try out the drilling a hole in a conventional engine thrmostat - a chevy 3.4 3400. Seems it allows the engine to burp out just the smallest amount of air that causes the coolant not to flow properly in the block due to some kind of air lock or something. Anyway I have seen it first hand stop a motor from overheating, and maintain a much more constant temperature. Unfortunately I cannot say for sure if this will work on a N*, because of it's unique operation, BUT I would definately give it a try.

Last night, I did some reading on a few forums, and I found that there are several mechanics that always drill a 1/16 hole in the stats that they replace. seems it gets the air out, and is an added measure of insurance. I believe this is different from that wiggle valve, as a wiggle doesn't open when under pressure, and the hole will always flow coolant & air out of the block.

Also enthusiasts that tend to race their engines also drill that hole, as they believe it keeps the coolant flowing enough that it improves the stat's response time to quick swings in temperatures from sudden demands on the engines (WOTS?). Additionally, because a stat opens so slowly, it better improves the engine from a sudden influx of ice cold coolant into a steaming hot engine - when operating in extreme cold conditions.

Additionaly, a 1/16 hole is believed to have little to no impact on warm up time or operating temperature.

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I doubt that 100% air (or more likely steam) ever reaches the stat coming from the radiator, and even so, its not likely that it would be below 195 degrees.

Here is a video that shows a stat opening from heat no water involved, when a head gasket has failed, it it not likely that either air (or more likely steam) or coolant is below the stats rating of 195 degrees.

http://www.youtube.c...feature=related

Correct, look at how much that stat has opened!! at 212, a OEM stat only opens up at most 1/4 of an inch. that welding tip the above stat is cooking on must be about 5oo degrees. - look at the way it is smoking - probably the wax exploding out of the brass in the thermostat. After such an extreme temp, that stat is definately now toast.

I should restate by saying air pockets slow down the opening time by enough that when the stat opens, the coolant in the head is already boiling over the other way out the block into the overflow tank.

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I think drilling a hole in the stat might be effective on an engine like the 4.9. That is, one that does not have a pressurized surge tank and purge line, but on an engine like the Northstar that has a purge line I think it is redundant and probably useless.

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