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What did you do to your Volvo today? (now Sticky)

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
1997 - 2000 V70-XC
1997 - 2004 C70

Chuck W
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Chuck W

Re: What did you do to your Volvo today? (now Sticky)

Post by Chuck W » Mon Aug 12, 2019 7:58 pm

ZionXIX wrote:
Mon Aug 12, 2019 3:30 pm
Spent the afternoon trying to diagnose why my low speed fan doesn't seem to work.

Things I've tested:
Low speed and high speed both come on if I ground out the yellow wires on the relay.
The yellow wires correspond to A7 and A22 of the ECU. I am measures 3-5 ohms for both wires up to the ecu.
I tried switching the yellow wires
I swapped out the relay for a spare
I tested the relay outside the car with a meter.


Conclusions:
Theory 1: bad ground --> cleaned as many as I could find a few weeks ago with a brass wire drill brush.
Theory 2: ECU is not grounding the relay properly = bad ECU
Theory 3: I could have 2 bad relays
Theory 4: reservoir cap is not holding enough pressure, not sure what they are supposed to withstand or what temps activate the fan.
Your '96 should have the OBD2 diagnostics, correct?

The "850 OBDII" app allows you to test the high and low speed fan function (through the ECU). I just recently used it and it works well. That will help rule out ECU wiring or ECU issues.



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bmdubya1198
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Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Mon Aug 12, 2019 8:23 pm

abscate wrote:
Mon Aug 12, 2019 7:23 pm
The upstate NY triangles...ALB ....SYR.....ROC.....ITHACA.......CORNING......ALB

0500-1930 in the P80 seat. I’m so glad I didn’t sell this car
Definitely one of the best seats to sit in for all that time!

Finally wrapped up the evaporator job today... what a pain! Vacuumed and charged up the AC a couple hours ago and it's ice cold now! I'm SO glad that's done. Just in time for tomorrow's forecast of 97 degrees!


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

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abscate
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Re: What did you do to your Volvo today? (now Sticky)

Post by abscate » Mon Aug 12, 2019 8:40 pm

bmdubya1198 wrote:
Mon Aug 12, 2019 8:23 pm
abscate wrote:
Mon Aug 12, 2019 7:23 pm
The upstate NY triangles...ALB ....SYR.....ROC.....ITHACA.......CORNING......ALB

0500-1930 in the P80 seat. I’m so glad I didn’t sell this car
Definitely one of the best seats to sit in for all that time!

Finally wrapped up the evaporator job today... what a pain! Vacuumed and charged up the AC a couple hours ago and it's ice cold now! I'm SO glad that's done. Just in time for tomorrow's forecast of 97 degrees!
Don’t put sealer in it!


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A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

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ZionXIX
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ZionXIX

Re: What did you do to your Volvo today? (now Sticky)

Post by ZionXIX » Mon Aug 12, 2019 9:26 pm

Chuck W wrote:
Mon Aug 12, 2019 7:58 pm
ZionXIX wrote:
Mon Aug 12, 2019 3:30 pm
Your '96 should have the OBD2 diagnostics, correct?

The "850 OBDII" app allows you to test the high and low speed fan function (through the ECU). I just recently used it and it works well. That will help rule out ECU wiring or ECU issues.
I had no idea that was a feature, will try it out tomorrow.

I did see another thought on Volvo speed. That post suggested looking at the temp sensor wires and clean them in case its resistance is being artificially increased causing the ECU to think engine temps are lower than what they actually are.



Chuck W
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Re: What did you do to your Volvo today? (now Sticky)

Post by Chuck W » Mon Aug 12, 2019 9:40 pm

It's worth it to check the sensor wiring. They can be finicky.

I don't remember where in the app the fan test was, but basically all it does it ping the fan relay from the ECU. It only activates the relay for a second each time you test it. That will at least rule out the ECU and it's wiring.



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bmdubya1198
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Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Tue Aug 13, 2019 7:58 am

ZionXIX wrote:
Mon Aug 12, 2019 9:26 pm

I had no idea that was a feature, will try it out tomorrow.

I did see another thought on Volvo speed. That post suggested looking at the temp sensor wires and clean them in case its resistance is being artificially increased causing the ECU to think engine temps are lower than what they actually are.
Yes, definitely give that app a download! I think it's only $1.99 on the Google Play store. I used it for fan diagnostics on my '98 and it worked very well.

It would be a good idea to look at the temp sensor wiring and connector as well, I had to repair the connector on my '98 because it was all broken apart. My S90 is the same, a previous owner fixed it at some point.


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

User avatar
bmdubya1198
Posts: 3044
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: '98 V70 GLT
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bmdubya1198

Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Tue Aug 13, 2019 7:59 am

abscate wrote:
Mon Aug 12, 2019 8:40 pm
Don’t put sealer in it!
Nope, I made sure to only use regular R-134A. I filled with two cans of that and two small 3 oz cans of R134-A/PAG oil.


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

User avatar
abscate
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abscate

Re: What did you do to your Volvo today? (now Sticky)

Post by abscate » Tue Aug 13, 2019 8:06 am

bmdubya1198 wrote:
Tue Aug 13, 2019 7:59 am
abscate wrote:
Mon Aug 12, 2019 8:40 pm
Don’t put sealer in it!
Nope, I made sure to only use regular R-134A. I filled with two cans of that and two small 3 oz cans of R134-A/PAG oil.
Someone else in previous life tried sealer. Good news is the orfice is the only thing that will plug up, so you should be good to go. That orfice does show why the sealer never makes it to the evaporator, where is it is needed, of course.


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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW

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bmdubya1198
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Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Tue Aug 13, 2019 8:32 am

abscate wrote:
Tue Aug 13, 2019 8:06 am
Someone else in previous life tried sealer. Good news is the orfice is the only thing that will plug up, so you should be good to go. That orfice does show why the sealer never makes it to the evaporator, where is it is needed, of course.
Yup, and I'm sure that's why mine was so plugged up. Someone tried to fix the evaporator with sealer, and it didn't quite do the job!

The orifice tube is a $3 part, if you're replacing anything in your AC system, change it! I guarantee just about everybody's looks similar to that at this point.


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

User avatar
bmdubya1198
Posts: 3044
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: '98 V70 GLT
Location: Charlotte, NC
Has thanked: 27 times
Been thanked: 85 times
United States of America
bmdubya1198

Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Tue Aug 13, 2019 5:06 pm

Weird picture... I actually drove the V70R to get parts for another one of my Volvos! It's usually the other way around!

Also got the S60 torn down to do the PCV tomorrow. I replaced the cams seals earlier, the front intake seal was blown out, causing the oil leak.
IMG_8596.jpg
IMG_8598.jpg


2000 V70R Venetian Red/Charcoal M56 Swapped 188k
2001 S60 2.4T Black/Black 230k
2003 S60 2.4T Silver/Black 106k
2007 XC90 V8 AWD Sport Titanium Grey/Black 155k
1998 S90- Silver/Gray 207k
Sold-
1998 V70 GLT Black/Beige 193k
1995 850 GLT Tropic Green... crushed
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it

Need used parts? PM me!

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