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You are not getting vacume from the engine compartment. Look for a cracked or broken line.( rubber or plastic) It may even be a line broken off of the engine. It could be off under the dash on passenger side but it is usually in the engine compartment if this was helpful please leave good feedback
ususal locations are..under the dash(near drivers knees or passengers knees)..or on side of dash(open front doors..look for access panel to pull)..or under your hood in engine compartment.
You will have to drain all engine coolant.Disconnect your battery and your two heater core hoses that are on the fire wall in the engine compartment.Now inside the car start removing your dash.one dash is removed you will have to open you heater box to gain access to the heater core once you have gain access remove and replace.Now start replacing heater boxes dash board and reconnect heater core hoses and reconnect battery.Now top up your engine cooling system with the engine antifreeze drained you should have a extra jug of coolant in case you spilled or just needed it to top up.Now start car make sure coolant is full when cooling fans come on put rad cap on you have completed the replacement of your heater core.
Generally the fuse panel will be located under the drivers side dash or a side panel access drivers side of the dash. Open the door of the vehicle and the end of the dash may or may not have an access. If those two locations are not the source of the fuse panel, the passenger side near the floor under the dash is most likely. There is a cover there (not part of the dash itself) but rather just in front of the door opening. Check these areas for the fuse blinkers. Fuse block for engine and such will only be in engine compartment.
There are three fuse blocks in most late model Cadillacs. The engine
compartment fuse block, the MaxiFuse relay center and the rear
compartment fuse block.
1991-93 Deville, are equipped with a fuse block located in the rear of the engine compartment. There is also a fuse/relay block, located in the glove box behind an access panel, or on the passenger side, under the dash.
Start with your fuses:
Fuses are in two areas. In the interior fuse box (left kick panel, below the dash--fuse chart on the cover) and in the engine compartment fuse box (far upper left as you face the car: fuse chart on the cover). Tail/Brake lights are combined with the Horn fuse in the engine compartment box. The fact that both taillights are out as well as the dash does not suggest the bulbs, but anything is possible. Tail light bulbs are accessed from inside the trunk compartment. Hope this is of some help
there are four.... 3 inside the passenger compartment on the drivers side... hard to tell if they are under the dash or accessable from a panel on the front or side of the dash board.... and one more in the engine compartment near or on the firewall.... passenger side.
Robert
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Under the dash for sure, but you may need to drop the whole box and may be mounted with bolts from the engine compartment. You will need to disconnect the hoses from the core from under the hood
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