ECC

No fault codes

Replaced relays under the dash.

Yes cold air is coming out the vents it will run continuously,burnt up clutch on old compressor,replaced compressor,charged system,same problem clutch will not disengage.

1989 Volvo 780 Bertone.The compressor clutch does not disengage,it will run continuously as long as the a/c switch is on.If you turn the swich off it will shut off. Thanks for any suggestions.Have replaced a/c low side pressure switch,and relays under the dash.

thank you for your help once again that is the control box i noted in my previous post, guy at volvo told me was for 940 heater control by part #. do you have any info on testing the $300.00 unit? thanks again

ok light is flashing all the time now and blower not working,still flashing 233 code excessive current draw from blower motor cannot find blower motor relay did you have any luck finding the relay? thanks again for the help I have been busy so havent had much time to mess with it.

removed the glove box there are no relays, there i found a box with 2 plugs it is screwed to the blower box. i removed it, it is a circuit board of some type, i called volvo with the part # they told me it was part of the heater control for a 940. cleaned it all up then going to put it back and ...

does the manual by chance give the location of the relay? have had no luck finding it so far.thanks again.

thank you do you have any other suggestions thank you very much for your time i guess ill get it figured out eventually i will let you know what i find.