overheating

CADILLAC DEVILLE
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BYLLH74
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i have a 2000 catillac devile DTS and i have had overheating problems for over a year now. i have changed my radiator, thermostat, and radiator cap. what else could my problem be? also how well does that Barrs Head Gasket Repair liquid work? thank you
Oct 10, 2007 at 8:44 PM
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RASMATAZ
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Could be a blown headgasket, crack head/block-

Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Oct 11, 2007 at 5:39 AM
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RASMATAZ
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From: byllh74
To: rasmataz
Posted: Thu Oct 11, 2007 7:38 am
Subject: thank you
thank you for your help. what would say about that Barrs head gasket repair liquid?


Never heard of it-I use Thermagasket or Steel Seal it works for me.
Oct 11, 2007 at 1:18 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.