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Chaosrob 1999 v70R 601 save, Going to need a lot of parts, lot of help and do a lot of reading.. Topic is solved

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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chaosrob
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Year and Model: 1999 v70R
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Re: Chaosrob 1999 v70R 601 save, Going to need a lot of parts, lot of help and do a lot of reading..

Post by chaosrob »

Questions for the experts yet again. I wound up buying a thermostat housing gasket, this one does not show signs of leaking. Should I just change the thermostat or remove the housing and replace the gasket? I am uncertain of proper protocol with this thing. TIA

scot850
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Post by scot850 »

Normally I don't remove the housing unless it is either cracked (by a dumbass breaking it trying to remove the thermostat screws), or I can't get the screws loose as they are corroded in or I've stripped the heads out.

I remove the 2 Torx screws and just replace the thermostat with it's rubber ring seal.

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

scot850
Posts: 14864
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Post by scot850 »

I usually try spraying with PB Blaster or like a day or so before trying to remove. I also have an extended Torx bit to allow it to clear the valve cover for the rear screw. I use a hammer on the Torx bit to shock the connection between the bolt and thermostat housing threads. It usually helps but not a 100% guarantee.

Good Luck!

Neil.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

454cid
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Post by 454cid »

I didn't have any issues getting my thermostat bolts out, but when I put them back, I used a bit of anti-seize to keep them free for next time.
1996 850
1999 S70 GLT (sold after deer hit)

2010 Ford Focus SE
2006 Cadillac CTS
1996 Mercedes C220
1999 Chevrolet K3500
1969 Buick LeSabre Custom 400

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Sveedy
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Post by Sveedy »

I've never had a problem with them either, but this last time (yesterday) I decided to switch out the torx bolts for a couple of cam cover bolts.
I don't know why they decided to go with the torx to begin with. Seems like everything else up top is 10mm.
Try to learn life's bad lessons vicariously through others.


1996 850 Turbo GLH ( Goes Like Hell )
1999 V70 GLT

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abscate
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Post by abscate »

It looks like tRue R tRim in metal is a sort of a flat silver while the T5 trim is dimpled. I think we found part numbers different too.
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A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 XC90-in-Red
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454cid
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Post by 454cid »

Sveedy wrote: 02 Sep 2025, 13:39 I've never had a problem with them either, but this last time (yesterday) I decided to switch out the torx bolts for a couple of cam cover bolts.
I bought some, but have never used them. My originals were so clean, and came out so well, that I didn't see the point in changing them. I used 1/4" drive tools, and I think I later bought a long bit for this job. I should look for that, as I have no idea where that would be now.
I don't know why they decided to go with the torx to begin with. Seems like everything else up top is 10mm.
My guess would be clearance on the assembly line. Those tools would have sleeves for safety covering them, so that people can't get gloves or whatever caught up in them. A ~10nm nut driver can twist a finger off, and 10nm is pretty low torque for automotive fasteners.
1996 850
1999 S70 GLT (sold after deer hit)

2010 Ford Focus SE
2006 Cadillac CTS
1996 Mercedes C220
1999 Chevrolet K3500
1969 Buick LeSabre Custom 400

chaosrob
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Post by chaosrob »

I got the Torx for the thermo cover off without any fanfare. Took the advice and soaked the bolts overnight with kroil and gave the t25 a couple raps with a hammer on each before loosening and came right off, thanks for the suggestions. I was really happy to see all the internal cooling passages in this thing were pretty clean and not overly corroded like the outside.


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chaosrob
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Post by chaosrob »

Sorry I haven't posted in a bit, I hadn't had time to do much work to it in the past three weeks. I am trying to get my property in shape before winter and putting up a cabin, shop etc while dealing with work, typical first world problems I know.

I finally had a few hours to get back on it and the engine is back together and running! I fired it up for the first time last night and it sounds good but I need to do a longer test run to check for any leaks etc before moving on to the brakes and suspension. I have never cleaned so much on one engine bay in my entire life, it was interesting trying to make 13 years of field sitting at least somewhat presentable. Every time I touched/removed something it was time to clean, clean, clean. Every loom was toast and all needed to be redone (I still missed a couple wires and need to get them addressed also. The list of everything replaced as preventative is embarrassingly long but I feel it is worth it to deal with now and call it done rather than wait for it to break when I am trying to enjoy it later.

I really want to thank everyone here for their assistance with my novice questions through this project. Not having any experience with the platform or even a manual for reference meant you saved me some time and potential issues I am sure. A big thank you to the community.

Tomorrow I will do a more length start up and run time to check for leaks, dribbles and screwups but it did start, idle and run smoothly. After these checks next is;

Finish installing exhaust. I need a downstream 02 sensor extension with the vast downpipe so waiting on the to be delivered.

All new suspension, brakes, brake lines, inner and outer tie rods, control arms, etc.

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scot850
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Post by scot850 »

Your project is coming along really nicely, as the saying goes, if it is worth doing, do it right!

It is amazing what a transformation happens, even when just cleaning all the years of crud off.

Neil
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

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