2003 ford focus compressor froze up. what is cost to havee replaced ?

most likely a problem starter motor or starter relay
take it to an accredited auto electrician and have it checked out

Contact a Ford dealer service center for a quote.

They make an AC idler replacement pulley, but you have to remove the Compressor and put on the pulley, but it works.

I assume it's because your clutch is engaging and disengaging. Could be from a loose electrical plug to your compressor coil on the compressor. It could be a loose plug to the pressure sensor or a bad pressure sensor because that sensor will shut it off if the car is low on Freon causing low pressure in the system. Could be low on Freon so it's on the edge of having enough pressure to turn it on and then shuts it down again because it dips below the pressure threshold when the compressor kicks in. Could be a bad compressor coil that engages the clutch. Maybe a loose connector to the AC Button in the car or the AC Button is intermittent. Could be an intermittent relay engaging the compressor clutch. That's a good list of what all could cause it and if you end up needing to replace the compressor, I made a video on how I did it.

I believe in 2003, we put a 100,000 mile Air filter assembly on the Focus to comply with California Zero emissions rule. Called PZEV. So, your filter should be a combination air filter/housing assembly that is sealed so no fuel vapors can escape. A new assmembly is over $150, so don't replace it unless you find one cheap on ebay. IF you really need one, I can get you one for 10% over cost. You can pay through Paypal.

it depends on certain mechanic shops. of course the dealer is always way higher. estimated 1 1/2 to 2 hours to put on depending if you have to pull off the timing belt. cost will be estimated about 250.00. call around some mechanic shops and see. some will be different than others.

are you sure it's the washer bottle sounds like the heater core is gone if window is fogging up it's the heater core

It sounds like you are low on Freon. Try bringing it to an A/C shop. They could do a recharge for you. Now days freon for your vehicle is alot cheaper than what it used to cost for R12. Good luck and if you found this solution helpful please rate it.

Thanks - Tech101