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Old 01-24-2013, 11:49 PM   #42
Beastly Adventurer
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Joined: Jan 2007
Location: central komifornia
Oddometer: 1,151
Semi-retired autotech-I have changed out a pile of heater cores.The GM cooling system tabs work great-last time I used some it was on a H1 Hummer with a leaky head gasket.Caddy dealers always have them.The reason heater cores fail is from not changing the coolant-it turns acidic after awhile and the heater cores are aluminum on late model cars & pu's.Pulling the dash isnt that hard-just time consuming and you need to be parked in the middle of a garage because both doors will have to be open.Follow a service manual.A good set of torx bits and a 1/4 drive socket set with extensions will be needed.Sometimes I pull the seats-you make up the time spent on this in the end.
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