Solenoid valve, heat exchanger (heater bypass valve) - Saab 9-5 WIS

[Deep]

Good Evening Fellows. I replace my By-pass valve in 2 months. 2003 Saab 95 Arc V6. Hot air blows in the cabin good. It again leaked today. Hoses are correctly connected as shown in these pictures. Please help. ...... Very Nicely explained. I thank you all. Nice to help each other.

[swisssaabist]

do you have thought to swap the entire valve for simple tubes ? like that no leaking again

[Deep]

Thanks for reply. No, I did not change the entire assembly, too much money. I replaced only Coolant bypass valve 2-times within 2 months. Both leaked at top vent. All the hoses are good. no cracks at all. the solenoid is bench tested with 12 volts. it functions correctly. Not sure what should be the voltage at the solenoid terminals. It reads 0.80 volts between the 2 terminals. Ground to each terminal is 12.8 Volts. the vacuum is good at the pipe.

[Deep]

HELLO Saab Friend, 2003 Saab 9-5 Arc
I replaced this Heater bypass valve 2 times in 2 months ( bought for $12.79 each on Ebay https://www.ebay.com/itm/7610-207-FI...72.m2749.l2649).
Dismantled it had pink diaphragm. The Original had black.

Both failed/leaked at the small hole vent above the diaphragm. What causes the failure.??? Any suggestion.?? The vacuum solenoid bench tested with 12 Volts, it works.
Please help. Thanks and regards.

Thought I'd throw up a DIY on a common problem with the '99-'09 Saab 9-5.This is a collection of ideas I was given by members on another forum and my personal experienced.

Symptoms of a coolant/heater bypass valve going bad:
-Coolant leakage under the firewall
-Smell of burning coolant
-In some cases (like mine) a catastrophic leak that dumps the whole coolant tank

Very straightforward replacement that I completed on my '03 Arc in about 55 minutes. Total cost was about $40 for the valve from eEuroparts.com

Tools needed:
-Narrow tipped pliers
-A socket set with wrench
-Bungee cord
-bucket (to avoid coolant spillage all over your garage)
-Cutters of some sort

Procedure:

1. Place the bucket under the car under the valve.
2.Mark the top tube with a pen/marker so you know where it goes afterward

Attachment 4112

3. Undo the wire harness box

Attachment 4114

and use the bungee cord to pull it toward the front of the car so it's out of your way.
4. Clip the zip tie from the top hose and remove all of the silver hose clamps and undo the hose from the top of the valve

Attachment 4113

5. At this point the valve should slide upward out of a bracket that is attached to, I believe, the hoses behind the valve.
6. Slide the new valve into the bracket and reconnect everything. Be sure to put a new zip tie where the original one was or else the valve will flop around the may come out of the bracket.

I hope I didn't leave anything out, I did this repair awhile back. If I did, chime in!

[hubervili]

Sorry for inproper English, my 9-5 floods pessenger space with hot air if ACC is off. So hot, it cause Electronic missfunctions on radio- goes off for second.., and turn signal indicator. Please help me out here..!

[swisssaabist]

Sorry for inproper English, my 9-5 floods pessenger space with hot air if ACC is off. So hot, it cause Electronic missfunctions on radio- goes off for second.., and turn signal indicator. Please help me out here..!

Hello, seems you have malfunction in blending doors so you can resolve your issue by yourself, first you need to do the diagnosis of your ACC




SaabWorld said:
2013-04-01
ACC calibration and fault codes - Saab 9-5
Model year 1998-2005

Calibration is done by starting the engine and simultaneously pressing the AUTO and OFF buttons. Calibration takes about 30 seconds. Calibration must be performed if the battery has been disconnected/discharged, if the ACC unit or a stepping motor have been replaced or its position changed.

Calibration is also automatic directly following engine start in the following cases:

new ACC fitted
+30 supply was cut earlier than 10 minutes after the ignition was last turned off (usually in connection with battery replacement).

While calibrating, the number of stored diagnostic trouble codes is displayed instead of the left-hand temperature. Diagnostic trouble codes 0-23 are displayed for 3 seconds each instead of the right-hand temperature.

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This is a list compiled from WIS documentation

Code Problem OBD
1 Internal control module malfunction B1605
2 Cabin temperature sensor - open or short circuit B1350
3 Solar sensor B1340
4 Mixed-air temperature sensor, LH - open or short circuit B1345
5 Mixed-air temperature sensor, RH - open or short circuit B2345
6 Stepping motor, air-mixing flap, LH - open or short circuit B2490
7 Stepping motor, air-mixing flap, LH - motor jam B2496
8 Stepping motor, air-mixing flap, LH - no mechanical contact with flap B2495
9 Stepping motor, air-mixing flap, RH - open or short circuit B2290
10 Stepping motor, air-mixing flap, RH - motor jam B2296
11 Stepping motor, air-mixing flap, RH - no mechanical contact with flap B2295
12 Stepping motor, air distribution flap - open or short circuit B2400
13 Stepping motor, air distribution flap - motor jam B2406
14 Stepping motor, air distribution flap - no mechanical connection between motor and flap B2405
18 Solenoid valve, heat exchanger shut-off valve - open or short circuit B2375
19 Circulation pump - open or short circuit B2380
20 Ventilation fan B2425
21 DC motor, air recirculation flap - open or short circuit B2410
22 ACC software
23 Sensor Ground
Let Us know about...

[Mvpsaab]

Hi
im new to this forum and i thank you in advance for any help
i have a 2003 9-5 aero with a code 18 in the acc unit
i have replaced both the valve and the solenoid (used) and checked fuse 31 and its fine
yet when i run the acc diagnostics code 18 is still there
any suggestions ??
thanks

[Mjollnir81]

Hi
im new to this forum and i thank you in advance for any help
i have a 2003 9-5 aero with a code 18 in the acc unit
i have replaced both the valve and the solenoid (used) and checked fuse 31 and its fine
yet when i run the acc diagnostics code 18 is still there
any suggestions ??
thanks

If I'm not mistaken, 1-8 code is drivers side blend door malfunction..

[Deep]

Getting to know more automotive repair. I think the cause is excessive pressure in the cooling system that burst the rubber diaphragm in this valve and leaks under the car. In summer when A/C is on the coolant is bypassed that creates more restriction (bends in hoses) and pressure. Excessive pressure is due to Head gasket leak, high pressure from cylinder transferred to cooling system.
To check head gasket without special tools see this
https://www.youtube.com/watch?v=MCo0SLeMEfk

Please correct me if I dont make sense. Always leaning. Thanks for reading. God bless us all.

[Mjollnir81]

hard to see but the solenoid mounted under the heater control valve i'm not sure how these hoses are supposed to be routed

Help!!! I am doing this right now, and I both of those vacuum lines became disconnected, I broke the check valve going to the intake manifold as well......