I have a 2001 E46 325ci and we have a hot days in perth, I want to be sure that it is a Final Stage Regulator problem. When I start my car the aircon comes on as normal, after 10mins the aircon cuts out for about 2mins, then comes on, then off. this lasts for a while. By that stage I have the windows down and its no good when ht e outside temp is 40 deg. Last summer it was fine, I has new gas put in and a check onthe compressor, it sounds like everything is on i just cant get a consisitant cold air.
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It sounds like your cabin air filter has stopped up common problem on these cars. You have to remove the glovebox to get to it. If this filter stops up, your fan will be running on high but hardly anything will come out of the vents.
Why do they want to replace the compressor?noisy?If you can put a charge on the ac then it's hot again after a day,then you have a leak.all the ac lines have o-rings where they are connected.without put dye in the system you wont know for sure.So I would try that first.
If there is air moving through the vents most likely the final stage transistor(blower resistor) has failed. It controls blower speed from a signal from the ihka (a/c control panel). the final stage receives the signal from the ihka of the drivers preference blower speed. the final stage pwm (pulse width modulates) the blower motor. which means it turns it off and on very quickly to speed up or slow down the blower motor speed. It isn't the easiest part to replace. Usually at a dealership i would expect to pay somewhere around $600 (including diagnosis)but don't hold me to it. bmw dealerships stand behind their repairs and usually include a warranty with the part of 2 years unlimited mileage.
Usually when your system stops blowing hot air it is your thermostat that is shot. That would be located where your top hose of your radiator meets the top of the engine. Check that because its easier to replace than a tear down to get to the actuator. Hope that helped.
I recently had a problem where the car was not blowing air into the cabin. I Changed the final stage resistor (also known as the "hedgehog")and all is good. its located in the driver footwell, remove the panels under the steering wheel, and you will see it stuffed up in the top left corner.
It's called a Final Stage Resistor.Cost about 85.00-120.00$
Remove the plastic cover behind the glove box (passenger side) look toward the drivers side close to the bulkhead and it will be there, disconnect the plug, release the clip and pull back gentally (don't break the clips!) it's pretty easy.
hi its your final stage regulator theres a guy on ebay selling them for about £45 gbp...the regulator when broke causes the fan to surge up and down and turn itself off and on by itself. ive just changed mine im 1000 percent sure of this..;)