Heater blower exchange

There are two ways to figure that out. One is to look on an auto parts store's web site. I use the Rock Auto site for reference almost every day. This works best when you have a specific donor car model in mind, such as when you own a parts car. If the part numbers for both applications are the same, the parts will interchange. When they are different, you will not always know why. It could simply be the plug is different, but you can move the electrical terminals to the old plug body. Rock Auto is very good about posting photos of the actual part from each of their suppliers, so you can look at the differences. From other web sites, they might just show a picture of a generic blower motor that is nothing close to what your car needs.

The best way is to visit any salvage yard and look in their "Hollander Guide". That is a large, very expensive book that lists every part for every car model and year with a code number. You look that code number up in the back of the book and it will list every application that used that same part. Now you can run through the yard and look for any of those models.

Be aware that many parts have differences based on the options, and some, Fords in particular, make mid-model-year changes. For example, they might have to go with a different supplier for the blower motor, and that supplier already has one designed and in production but the mounting holes are different. The car manufacturer would have to redesign the heater box the motor mounts in. In that case, you could get a part from the same year and model but the part would be different.

A better example might be for a car with air conditioning vs. A car without. The heater box for the car without air conditioning would be smaller, and there would be fewer vents to blow air out of. Both of those warrant a smaller and less-expensive blower motor. The car manufacturer will always go with the least expensive part that will get the job done.