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My '86 740 has all the "common" problems[ALL/1998] posted by Bill on
Monday, 24 November 1997, at 9:59 p.m.
After reading this B.B and looking at Volvo catalogs (like IPD), I have come to the conclusion that my '86 740T has exhibited almost all the common problems with the 700 series cars from bad trunk shocks to a bad air flap in the air box to brake light lenses that hold water to a heater blower that chirps a lot to a heater control that is either off or an inferno (with a 1/16 in. movement above coolest).
The last problem was the thermostatically controlled flap in the air box. I was pushing nothing but hot air through my poor air mass meter for I don't know how long. I only checked it when I noticed zero power off the line (until the turbo kicked in). My fix was to screw the flap down to the hot air side. Runs a lot better now. I am in S. California so I don't really worry about temperatures below 40 degrees F.
Question: Does the electric fan in front of the condensor supposed to come on when you don't run your A/C? Mine does (when I have been in stop and go traffic). So does my friend's '93 940T (again, only when the engine gets overly warm). I thought it was only supposed to come on when you select an A/C setting (compressor on).
Bill
Re: My '86 740 has all the "common" problems[ALL/1998] posted by Brian Killins on
Monday, 24 November 1997, at 10:12 p.m.
I believe that my 760 turbo's electric fan is only controlled by the temp switch in the radiator, so yes, it is likely that the fan will come on without using the air conditioner. It has been suggested to me to put a relay in and have the fan come on all of the time that the AC is working. Supposedly there is a concern of high pressure.
Re: My '86 740 has all the "common" problems[ALL/1998] posted by abe crombie on
Monday, 24 November 1997, at 11:27 p.m.
The fan has a temp switch in radiator on that model, no a/c pressure switch.
Your friend's 93 has only an electric fan and will come on due to a/c pressures (low fan for medium a/c pressure, high fan for high a/c pressure) or for engine temp as read by the engine control system on Bosch made systems or by a radiator temp switch on Bendix/Siemens supplied systems. As for the problems mentioned, all 10+ year old cars have parts that wear out/fail, this is what keeps mechanics and parts sellers from starving to death and is not something that only Volvos experience. If your heater control is an on-off switch on a 700 series model, then you have an air mix door that is not moving or is not adjusted to close fully. When you move it to full cold the hot water is shut off by a vacuum operated valve and a stuck open/not moving door would allow excessive heat the moment you move the lever away from full cold when the hot water begins to circulate in the heater. You should be able to hear a door slam closed in your climate system when you move the lever to full hot and to full cold.
Re: My '86 740 has all the "common" problems[ALL/1998] posted by Bill on
Wednesday, 26 November 1997, at 8:02 p.m.
Abe,
Thanks for the information on the heater control. I didn't mean to imply any disgust at the myriad of problems I have had, just my surprise that I had to experience all of them.
Bill
Re: My '86 740 has all the "common" problems[ALL/1998] posted by Warren Bain on
Friday, 28 November 1997, at 12:30 p.m.
I too have a '86 740, turbo, and I am having my problems as well. I go to the junk yard for most things now, since factory parts are so much. I replaced the trunk shocks from a junker and it works fine now. I removed the heat riser duct from the air box, since mine has an intercooler it doesn't make much sense, and it runs fine. The windsheild wiper motor gave out so off to the junkyard. It was a bear to replace though. I live in Northern Virginia and I go to Skips junkyard in Stafford County, Rte 234 and Rt 1. Best of luck!!!