Cost to replace blower motor on Honda Accord?

Could be that the motor needs to have the brushes replaced.

Someone knowledgeable will need to check out the electrical system to see whether the clutch, the relay, the wiring, or the dashboard switch is the cause of the problem.
The clutch itself is the most likely cause, with the wiring second.
These can be replaced, but very commonly a repair shop will wish to replace the clutch and the compressor both, instead of just the clutch.
The cost can be high. ( $500 - $1000 parts & labor)
God bless your efforts.

labor time is about 2 hrs. is not complicated DIY.

Its up near the glove box. Easy job. Don't pay the dealer $250. It cost me around $40 and took about 5-10 minutes to remove and replace. This is the problem 80% of the time and NOT the blower motor.

normally the IAC valve can be cleaned(the pintal on valve & the seat get dirty/carbon
)usually pretty accessable
so maybe an hour labor or DIY not hard to do
good luck

There are many parts to an ignition... Ignition switch, plugs, wires etc... If you're unsure, have a local shop diagnose whatever you feel is a problem and they can access & give you a price. Prices on parts & labor vary widely from shop to shop.

90k miles, recommended to replace also the water pump, idler and tensioner pulleys. Shop costs (3hr labor) $450-$750 depending on their labor rate and parts price.

Is the noise comming from the passanger side floor?
Its Probably the blower motor, Could be around $350 for replacment and labor.

Technically, nothing else needs to be changed when replacing a timing belt, however it is recommended or suggested to replace the timing belt tensioner and water pump while doing the belt. These items are only accessable when doing a timing belt. The cost should be under $100.00

depends where you live an average cost in the USA parts and labor aprox $850 sorry