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you have to remove the intake tube and then it should expose the ignition system on the drives side of the cylinder head... or... follow the spark plug wires...
The heater core is located there just under the dash in the plastic enclosure. AC parts may also be there. Remove the heater enclosure to expose the core. You will have to disconnect the heater hoses from the engine to remove the core and enclosure. Then inspect the core for the leak, usually at a line connection. The core can then be soldered or sent to a radiator shop for repair. You should have some expertise in repair to attempt this job on your own, otherwise take it to the shop. Some people would try radiator stop leak since the heater core is part of your cooling system, but I wouldn't recommend it. Remember to replace the anti freeze when you are done.
Subject: INTERMITTENT HORN BLOWING WHEN CAR IS COLD (REPLACE CONTACT ASSEMBLY/VINYL PAD)
Models Affected: 1989-93 SUNBIRD AND 1992-93 GRAND AM MODELS
CONDITION
Some owners of 1989-93 Sunbird vehicles and 1992-93 Grand Am vehicles may experience intermittent horn blowing when car is cold.
CAUSE:
This condition may be caused by excessive shrinkage of the contact assembly components when cold. This forces the horn pad contact plates together which activates the horn.
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