Very small crack on plastic housing of furnace blower motor?

Seems high for a small motor. Look it up online and you might find it for $40 bucks. You will be able to see their markup and labor for this job then call around and get some more quotes. Need to search that model number on a HVAC website.

There are a couple different motors, one is to circulate air inside your home and the other is to move combustion gases to the outdoors. The draft fan inducer or vent inducer is the latter kind, it moves the gases that result from combustion to an vent and to the outdoors. A crack in the housing can allow CO2 or other poisonous gases to enter your home. This is not the sort of thing that you save money on by putting off until the problem gets worse.

However, you might be able to save some money by ordering the part from a parts house or even from the guy who gave you the quote and then installing it yourself. But before you do, take a look at the existing motor and decide whether it looks like too much of a challenge. Generally, the motor is held in place but a couple screws or simple mount and then wired with a quick release wiring housing. Because this unit needs to be sealed tightly to avoid leaking toxic gases, you need to be certain you understand how the seal works and that you can properly seat and seal the housing so that it is airtight.

If you decide to go ahead and let the technician do the job, the price he quoted doesn't sound out of line. Prices vary for labor depending upon where you live and some companies charge top dollar for parts, but the only way to really be sure is to get a couple more quotes. However, most will charge for a service call and if they do, there go any possible savings.

Good luck and be safe.