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Cooling System Problems need help


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1999 Cadillac deville 4.6L overheating problem

it needs a head gasket so i put some stop leak in it which plugged the thermostat i thought so i put a new thermostat in but it didnt fix the problem still over heats is it just an air lock or is the whole system plugged with the stop leak (i think it was Bars Leak)

help would be very much appreciated

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How do you know it needs a head gasket?

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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Well if you had it tested or did a test and are confident that there are combustion by products in the coolant and the head gasket is bad, there is NOTHING you can do to seal it.. No SEALANT will fix it, it will continue to overheat.

The headgasket is NOT breached, the bolts pull from the block and the head gets pushed up, sealant will NOT seal that type of problem

If you decide to get it fixed make sure you find a mechanic that can repair it correctly with timeserts, do not listen to mechanics that think they can just replace the head gaskets and bolt the heads back on, it must be timeserted

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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Well if you had it tested or did a test and are confident that there are combustion by products in the coolant and the head gasket is bad, there is NOTHING you can do to seal it.. No SEALANT will fix it, it will continue to overheat.

The headgasket is NOT breached, the bolts pull from the block and the head gets pushed up, sealant will NOT seal that type of problem

If you decide to get it fixed make sure you find a mechanic that can repair it correctly with timeserts, do not listen to mechanics that think they can just replace the head gaskets and bolt the heads back on, it must be timeserted

well that kinda sucks what does timeserted mean? i have the haynes book and was planing on doing it this weekend but maybe i shouldn't. the sealant does fix it for a little bit this is the second time i have used it.

Edited by brad7654321
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Its a huge job, the engine needs to be pulled or the engine/tranny carriage dropped.

<br>

Here is the timesert web site

<br>

http://www.timesert.com/

<br>

Here is a video

<br>

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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