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Oldsmobile Forum: heater core change on 91 cutlass ciera ?
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Old December 8th, 2011
kensworld5 kensworld5 is offline
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heater core change on 91 cutlass ciera ?

Does anyone have a detailed procedure to change the heater core on a 1991 Olds cutlass ciera 3.3L with AC? What’s the easiest way to get to the hoses on the firewall? Details on inside components to remove including screw locations. Pictures if you have any would help. Thanks, Ken
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Old December 9th, 2011
revon revon is offline
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LOL, that's one of the easiest cores to do in the world .... just shy of a 78 malibu. The smartest thing to do is open the hood so it's standing straight up to the sky. Use the prop rod to put in the hole in the hinge. I've had to sometimes bend the rod just a bit so it doesn't pop out and have the hood drop on your head. The clamps to the core are right there on the right side at the firewall, simple to get at. as for inside the car, There are 2 screws that hold the lower diffuser cover on, they are sort of half way down from the top edge of the cover, and in a hole or depression which is about an inch from the Left and right side edges. IF no one has ever touched the heater box before, you will find that the screws use a 5.5mm socket in a 1/4 inch drive, to take them out. All the heater screws should be 5.5 mm heads, except for maybe if there is a screw inside the car near where the core tubes come through. When the the diffuser is ready to come off, there maybe or should be, 2 clips at the top that hold it in. Anyway, When the cover is off, there is like 7 of these screws around the outer edge of the heater box. After they are removed, the lower half will drop down, and then needs to pull back, as I said, there may be one or two near the floor where the tubes go through, maybe a 10mm head on it. Some have it some don't. Once the lower cover is off, the heater core is right there. There are 2 bands that hold it in. The screws I think have 7mm heads on them. You only need to remove 2 on the same side and loosen the other 2 about a half or full turn. The upper band will move up and the lower moves down, the heater core will pull out. Since you've never done it before, go to the junk yard and practice. Most all the mid size gm's are the same, ciera, century, beretta, corsica, blah, blah, blah, mostly since 88 up. Don't hold me to it, but I think that's about right.

Last edited by revon; December 9th, 2011 at 10:28 PM.
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