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DennisCooper

AC stopped - Could Final Stage Resistor be cause?

8 posts in this topic

Hi all

6-8 weeks ago, I switched my AC on and I got some cold air and then petered out. I then switched the AC off and had the temperature on the lowest setting and I still got warm/hot air. Classic Final Stage Resistor failure symptoms.

today I had my AC re-charged and switched the AC on and got no cold air. Looking at the engine its clear that the AC compressor is not spinning - could it be possible that as the Final Stage Resistor is kaput, that it knocks out the AC compressor switch on as well?!

I'm hoping by changing the FSR the new part will 'send the signal' to switch the AC compressor on. The machine today said that theres no leaks in the system as it tests the pressure prior to taking the old gas out before refilling.

Anything else I can try or get my mechanic to look at that's common to fail or not work with the AC system?

Cheers, Dennis!

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The fsr is for the fan inside the cabin and not the a/c comp! When you switch the a/c on is there a load pit on the engine? If so it sounds like you've got a seized comp!!

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Is the compressor not controlled by a solenoid clutch that either lets the comp pulley either idle or drive the compressor?

I had an old rover and this happened to me, it was a rather large three pin electronic power switching relay that was not switching the electric clutch.

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Well, it could be one of many things. Any number of sensors, valves, fans etc. It maight be worth getting the A/C fault codes read.

A common fault is the condenser fan (in front of the radiators) can seize- check it spins freely.

You can apply 12V directly to the compressor briefly. See if the clutch clicks in to rule out this.

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Dunno if this'll help, but I had a failed FSR on a '97 Touring recently.

The blower fans were completely dead, but the compressor was still kicking-in and cold air would dribble out of the vents.

One new FSR (well, second hand!) & it's all working.

So, I reckon the FSR doesn't effect whether or not the compressor clutch will engage or not.

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FSR is nothing at all to do with the AC, if your compressor is not turning, then check the operation of the magnetic clutch, check the fuse & check the system pressure, if you had a bad leak for example, the system would not run as the LP switch would hold it off

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Cheers all!

I'll be soon giving my car to my mechanic who'll be able to sort this out for me and a few other little niggly things as well :)

glad the machine did that test today, not sure how reliable it is, but I don't have leaks apparently! hope the fix isn't too pricey !

Thanks, Dennis!

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