...volvo forums.(but i do have an 1800).
... the blue border around the 'a/c' switch is blinking on my '90 760 turbo wagon.
.... the blinking is apparently an a/c fault indication. the dealer had replaced the headliner just prior to the sale. he said there is an a/c sensor near the dome light.so the blinking may indicate a faulty sensor. the blinking was apparently caused by disconnecting and reconnecting the sensor in the process of replacing the headliner....
its a 60 mile drive to take it back for him to look at it. but he said he was trying to contact a few dearers and other volvo specialists to get a suggestion. if he gets an answer, he can give me instructions over the phone, hopefully. the a/c seems to be functional...
...
sooo...anybody here got any suggestions?
tia, flaps

Check this out::

http://www.brickboard.com/FAQ/700-900/HeatingAirConditioning.htm#ECCClimateUnitDiagnosticCodes

It's the 700/900 FAQ section that gives the trouble codes. Your dealer probably didn't make the connection for the ambient temp sensor in the cabin.

HTH,

someguyfromMaryland

I'm really in deep water here, BUT:

I've got a Volvo original "Servicehandbok" for 740 '90-models, with wirring-diagram or so, maybe this can't be of any help but:

It seems that there is 3 sensors, "pressure guards" -one for low pressure, contact when 17 bar, high pressure, contact when 23 bar and then a "cut-out" sensor when pressure reach 29 bar.
I can't right here and now translate "headliner" (?) - but could it be that the pressure in the AC-system is incorrect? -or someone switched the wirring for the sensors?..

Unfortunately there is no "fault - diagnose" diagram in the manual.

/Soren
(Denmark -next to Volvo-Sweden)

700 faq and figured out the a/c fail codes after a little screwing around.
looks like the sensor near the dome light, as expected, and also the sensor on the dash speaker unless i didn't shine a bright enough light on it....(fwiw, two fail: codes 131 and 161)
... thanks again, gents.