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94' Volvo 855T no air comes out the vents (ECC)

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
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henrysin44
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henrysin44

94' Volvo 855T no air comes out the vents (ECC)

Post by henrysin44 » Sat Mar 02, 2019 10:34 pm

This happened one day, turned the fan on max, blower comes on but only the slightest amount of air comes out of the vents, just enough to take forever to heat the cabin. The center dial does nothing and only sometimes can i hear a vent move when turning it. I checked the blink codes and every motor is 'runnig too long'. Also some times the blower motor doesn't come on unless i restart the car. Anyone experience something similar? Seems odd one day every motor would quit.


Black 1994 Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims
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jreed
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jreed

Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by jreed » Sun Mar 03, 2019 6:38 am

It sounds like you can hear that the fan is turning at full speed, but you're not getting any airflow. Is that right?
Some guesses for things to check/consider:
Could it be that the white plastic recirculation arm has popped off of the damper shaft?
Did you try reseting the error codes in the ECC and then seeing which ones return?


1997 855 GLT (Light Pressure Turbo) still going strong. Previous: 1986 240 GL rusted out in '06, 1985 Saab 900T rusted out in '95, 1975 Saab 99 rusted out in '95, 1973 Saab 99 rusted out in '94

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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by scot850 » Sun Mar 03, 2019 10:22 am

If the inlet air flap is jammed closed this would give this issue. Could be the small servo motor is bad and not opening. For the moment I can't think but if the flap plastic actuator arm is broken, I thought it leaves the flap in the open position? Reason for thinking this is having owned a few, I have found the arm broken on several cars and not had any air issues.

I'd suggest removing the glove box and check if the arm on the inlet flap is working. If you set the ECC to re-circ the flap should close. If it is closed in any other position then the motor is bad.

Neil.


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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by Sommerfeldt » Sun Mar 03, 2019 1:57 pm

This doesn’t seem entirely accurate. Even if the REC is engaged, there should still be airflow controllable by the fan. I’d suggest checking the flaps, of course, but also check that the inlet under the cowl isn’t clogged, and that the filter (if there is one) isn’t clogged or soaked with water, for example.

- S


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henrysin44
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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by henrysin44 » Wed Mar 06, 2019 4:31 pm

Ill take a look at the cabin air filter and REC actuator arm, hopefully its one of those, trying to avoid having to remove the dashboard. Oh forgot to mention but if I open the air-mix air comes out of the center vents full blast.


Black 1994 Volvo 855 2.3L Turbo - manual swapped, turbo swapped, green injectors, custom M4.4 Tune, straight pipe, custom two-tone interior, V70R seats & rims
Silver 2000 Volvo V70 XC 2.4L Turbo - AWD winter package!
Silver 1997 Honda CRV 2.0 AWD - its in a very sorry condition, but drives
Black 2000 VW Jetta 1.8L Turbo - 5 speed manual, beat up, leaks all of its oil, and can make it from point A to point A-1/2.

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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by scot850 » Wed Mar 06, 2019 5:05 pm

When you have the glovebox out to check the air intake, also check the drive motor on the RHS of the center column behind the radio area. The 850's have a habit of breaking/splitting the connection between the motor (a square section plastic sleeve) so although the motor turns the flap inside the heater box does not turn. Often this can be repaired with a zip-tie around the cracked sleeve pulled tight. You used to be able to buy the part but I'm sure it must be N/A by now but worth checking.

Check the database as I used that as a giude many years ago with our 93 850 GLT.

Neil.


2000 V70 R - still being an endless PITA
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2003 Toyota 4Runner V8 Limited
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1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by scot850 » Wed Mar 06, 2019 5:08 pm

Should have added. When working on the system, it is always worth cleaning the 2 small cabin air temp sensors. They are hidden behind the grab-handle above each front door. These build up with crap in the air over time and they have a little fan to pull the cabin air over the temp sensor and this gets clogged and cannot adjust the temp.

Neil.
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2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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Re: 94' Volvo 855T no air comes out the vents (ECC)

Post by Klausc » Wed Mar 06, 2019 8:25 pm

Clear the ECC codes before you do anything. I cannot envision all vent flap motors dying.

I had an 850 where the owner tried to 'reset' the flap positions, 9-9-9 exercise, but failed. This caused the center stack flaps to get stuck in the closed position. I had to remove the dash to get it all working again. Fortunately it was Spring and not cold weather.

Usually, the 'slow to respond' will show up in cold weather when the ECC is left in manual mode rather than Auto. The vents need to be actuated by rotating vent the dial very slowly (10 seconds in each position) several times. Same for the recirc switch.


Klaus
If I had a larger garage, I could have more Volvos.

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