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Aloha and thanks Scotty,

You said in a previous post to put in some MMO and drive the hell out the engine to free a sticky lifter. I did just that, not MMO but another lifter cleaner and drove to town in 2nd gear. Punching it up to 80 then back down to 45-50 again and again. The engine is quiet as a church mouse now!

The thing got real hot though, (248 f). I had to put it in neutral, turn off the air, and blip the engine to get it to cool down to 220 F. I think that it was the transmision the made the heat.

Becaust of the bad head gasket, it blew out one gallon of coolant. ( it only blowes it out at temps over 215 f. If and when I get a job, I will get the gaskets replaced.

Thanks again Ed

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Pretty cool eh?

You beat on them, and they turn around and love you more!!!!

ONLY a CADDY :D:D:D:D

Life is too short to grow up!

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Aloha and thanks Scotty,

You said in a previous post to put in some MMO and drive the hell out the engine to free a sticky lifter. I did just that, not MMO but another lifter cleaner and drove to town in 2nd gear. Punching it up to 80 then back down to 45-50 again and again. The engine is quiet as a church mouse now!

The thing got real hot though, (248 f). I had to put it in neutral, turn off the air, and blip the engine to get it to cool down to 220 F. I think that it was the transmision the made the heat.

Becaust of the bad head gasket, it blew out one gallon of coolant. ( it only blowes it out at temps over 215 f. If and when I get a job, I will get the gaskets replaced.

Thanks again Ed

Thanks Ed, we need to talk about that overheating problem. How sure are you that its a head gasket? Have you pressurized the cooling system? Mike

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The 4.9 is not really known for overheating. Consider this list:

1) a bad thermostat that is stuck closed or partially closed, I would buy an OEM thermostat and seal, and replace it after checking for the obvious.

2) less than a 50/50 mix of coolant

3) a bad radiator cap

4) low coolant

5) cooling system pressure loss (cracked side tanks, hose leaks, etc), pressurize system and see if it holds pressure

6) a clogged radiator

7) cooling fans not working properly or not working at all, check operation

8) debris restricting air flow, leaves, palm trees, surfers, etc

8) a hose collapsing on the suction side of the water pump, spring rots out

9) a leaky head gasket

See this post that I posted to for more suggestions on a 92 Seville:

http://caddyinfo.ipbhost.com/index.php?sho...ic=6681&hl=stat

We have to get your Seville running cool!

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Aloha Mike,

No I have not pressurized the system. Wouldn't I have to pressureize it at 230 degrees f ? A radiador shop said that there was exaust gasses in the coolant and coolant in the exaust gasses. The engine heats up to 180-185 f and holds quite well around town.(good thermostast) It is only when I stop in traffic or at lights that the temp rises. Then the coolant gets low and starts to get hot. I replaced the coolant about 100 miles ago, It was pretty and green until the first 230 f came up and then turned milky and had black sludge like stuff in it.

The mix is 50-50, this is the third cap. Some form parts house, some from dealer.

The tank could be cracked, that would expalin the loss of coolant but where would the ugly coolant come from? I really would be happy if it is the radiator, but...... Please let me know what you think. I tested an El Dorado the other day and it wasn't half the car my Seville is, just alot faster! Thanks Ed

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I tested an El Dorado the other day and it wasn't half the car my Seville is, just alot  faster!

HEY !! Whatchit what you say about Eldorados. :D:D:D

Regards,

Warren

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There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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The 4.9 is not really known for overheating.  Consider this list:

1) a bad thermostat that is stuck closed or partially closed, I would buy an OEM thermostat and seal, and replace it after checking for the obvious.

2) less than a 50/50 mix of coolant

3) a bad radiator cap

4) low coolant

5) cooling system pressure loss (cracked side tanks, hose leaks, etc), pressurize system and see if it holds pressure

6) a clogged radiator

7) cooling fans not working properly or not working at all, check operation

8) debris restricting air flow, leaves, palm trees, surfers, etc

8) a hose collapsing on the suction side of the water pump, spring rots out

9) a leaky head gasket

See this post that I posted to for more suggestions on a 92 Seville:

http://caddyinfo.ipbhost.com/index.php?sho...ic=6681&hl=stat

We have to get your Seville running cool!

I guess we'll call this "Scotty's List." Could make a movie of it? :lol:

re: #8(a), ROTFLMAO!

Regards,

Warren

Posted Image

There is no means of avoiding the final collapse of a boom brought about by credit expansion. The alternative is only whether the crisis should come sooner as the result of a voluntary abandonment of further credit expansion, or later as a final and total catastrophe of the currency system involved. - Ludwig von Mises

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  • 2 years later...
The 4.9 is not really known for overheating.  Consider this list:

1) a bad thermostat that is stuck closed or partially closed, I would buy an OEM thermostat and seal, and replace it after checking for the obvious.

2) less than a 50/50 mix of coolant

3) a bad radiator cap

4) low coolant

5) cooling system pressure loss (cracked side tanks, hose leaks, etc), pressurize system and see if it holds pressure

6) a clogged radiator

7) cooling fans not working properly or not working at all, check operation

8) debris restricting air flow, leaves, palm trees, surfers, etc

8) a hose collapsing on the suction side of the water pump, spring rots out

9) a leaky head gasket

See this post that I posted to for more suggestions on a 92 Seville:

<a href="http://caddyinfo.ipbhost.com/index.php?sho...ic=6681&hl=stat" target="_blank">http://caddyinfo.ipbhost.com/index.php?sho...681&hl=stat</a>

We have to get your Seville running cool!

I guess we'll call this "Scotty's List." Could make a movie of it? :lol:

re: #8(a), ROTFLMAO!

Regards,

Warren

Warren, I don't know how I missed this reply by you.... Funny, Scotty's List.... :lol: :lol: :lol: I think I was on vacation when you posted this..

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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The engine heats up to 180-185 f and holds quite well around town.(good thermostast) It is only when I stop in traffic or at lights that the temp rises. Then the coolant gets low and starts to get hot.

Thanks Ed

This statement makes me wonder about proper cooling fan operation.

They need to be checked.

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The engine heats up to 180-185 f and holds quite well around town.(good thermostast) It is only when I stop in traffic or at lights that the temp rises. Then the coolant gets low and starts to get hot.

Thanks Ed

This statement makes me wonder about proper cooling fan operation.

They need to be checked.

Jim, If I recall Ed's 4.9 had internal corrosion and a pulled bolt and he was unable to have a new head gasket installed. He needed to put it down..

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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Jim, If I recall Ed's 4.9 had internal corrosion and a pulled bolt and he was unable to have a new head gasket installed. He needed to put it down..

Really sorry to hear that.

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The thing got real hot though, (248 f). I had to put it in neutral, turn off the air, and blip the engine to get it to cool down to 220 F. I think that it was the transmision the made the heat.

Be careful putting it into neutral. When you have the car in neutral, the pump for the tranny does not run so you can smoke your tranny by it getting too hot because the pump isn't running.

-Dusty-

- 02 Seville STS, white diamond

- 93 Sixty Special, Tan with vinyl top

- 79 Coupe DeVille, Tan with Tan top

- 06 GMC Sierra Z71, Black

- 92 Silverado C1500, black and grey

- 83 Chevy K10 Silverado, Black and Grey

b80385550.jpg

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The thing got real hot though, (248 f). I had to put it in neutral, turn off the air, and blip the engine to get it to cool down to 220 F. I think that it was the transmision the made the heat.

Be careful putting it into neutral. When you have the car in neutral, the pump for the tranny does not run so you can smoke your tranny by it getting too hot because the pump isn't running.

If I am not mistaken the pump runs constantly when the engine is running, in all gears, the clutches are NOT engaged

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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So was the Marvel Mystery Oil placed in the Gas Tank or in the Engine Oil or Both?

Ed had a stuck noisy lifter and he put it in his oil, he had a pushrod 4.9. Recently Marika had a noisy 4.9 also and the lifter noise when away. I had an occasionally lifter noise in my 4.9 also, that was noisy after a high RPM low speed romp.

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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