Check the second post down
https://caddyinfo.ipbhost.com/topic/20725-97-sts-heater-core-remove-and-replace/
SOURCE: replace power steering pump and lines 1992 cadillac seville sts
you need to have a pulley puller to get the pulley off if you don't have one most auto zone part stores have a loan a tool program and they can help you with that on most powersteering pumps the high pressure line will be a fitting or bolt on and the return line is usually just a squeeze clamp hope this helps good luck
SOURCE: I have a 94 cadillac seville sts, end I have a
First thing you have to do is list all the codes, because some some might be stored for a long time. Pushing the OFF and WARM buttons together and holding will ghive you all the stored codes. Then press OFF and HI together to clear all codes. Hold and wait for bars or 0's. Now start your car and let it get up to proper operating temps. Take car for aride that aincludes all phases of driving including highway speeds. Observe SERVICE ENGINE LIGHT for coming on . Assuming it does , repeat steps previously provided, read codes stored and repair accordingly. If need be contact me with new codes and I will try to assist you.
SOURCE: how to install
4.9 disconnect negative battery cable,drain the coolant from radiatorremove coolant reservoir, loosen waterpump pulley bolts,a screwdriver can help keep the pulley from turning,remove drive belt,remove idle pulley,remove waterpump mounting bolts(they are different sizes,some are star shaped) do not pry on waterpump until all bolts are removed,clean gasket surface,use gagket sealant and install new water pump(start all bolts before you torque any down.)
SOURCE: Can the Head Gaskets be replaced on a 2001
Yes , but it is very time consuming and if you have never replaced head gaskets before then I would not suggest that this vehicle be your first.
SOURCE: I HAVE A 1994 CADILLAC STS AND NEEDING TO REPLACE A HEATER CORE
This can be a very difficult repair. If you pay someone to do it, the labor costs are very high due to the amount of labor necessary to even access the heater core. I cannot tell you step by step how to do this. I can however tell you that you will have to remove enough of the dash to allow access to the core. Go slow, be careful and do not break any of the parts. Use common sense to figure out how the parts come apart. Look for screws and clips. Some plastic parts just snap together. Take digital photos as you go along to help you in reassembly. It is just a matter of getting to the core and removing it. Of course you will need to drain and flush the cooling system, replace the thermostat, and add a fresh 50/50 mix of DexCool & Distilled water after installing the new core. Be sure and set the heat to high when pouring in the fresh coolant. Bleed all air from the system.
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