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Heater Core Install 98 V70 Auto Non-Turbo

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

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Eddystone
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Eddystone

Heater Core Install 98 V70 Auto Non-Turbo

Post by Eddystone » Sun Sep 17, 2017 4:23 pm

Just a quick September 2017 note for anyone contemplating replacing the heater core in this series Volvo. Read the How-To's available here at this forum. Watch the RobertDIY YouTube video (Robert's a contributor here.) After doing this research, my experience today was that there were no surprises, and I was successful. There are a couple of things that are a bit trying because you really need to get all the way in there and probably on your back.

I had noticed that sweet smell when the temperature was turned up and air flowed through the core, but had no major leaking. My core was leaking slightly and showing corrosion in exactly the places these things always fail, namely, where the plastic tank meets the aluminum heat exchanger.

I bought the $39.00 Swedish Car Parts Estonia-made heater core that has so far gotten good reviews for quality and function. I received mine promptly, and it does look nicely manufactured. This core differs from all of the others in that it is made differently from the Volvo OEM core. The joint between the aluminum and the plastic side tanks where the standard cores always fail is "crimped over" with metal for what appears to be a much more positive bond that will be less likely to come apart from repeated heating and cooling cycles. The plastic tanks are now made of black plastic which the vendor says is superior to the previous "ivory" colored material. It fit perfectly, had the proper hole for the screw holding the pipes in, and required no modification whatsoever.

Post-Install Note: I do detect an oily smell in air coming through the heater core after heating it up thoroughly. I smelled it right up close before installing it and smelled nothing. I'd recommend you degrease the metal part of this thing thoroughly before installing.

There has been some talk about whether or not to use the o-rings supplied with this core. Some people have had leakage with them while others have had no problems. Some recommend only using OEM Volvo o-rings despite the $3.69 price because they are slightly thicker than the o-rings supplied with the core. I had obtained 6 pieces of Volvo Heater Core/Hose O Ring (850 C70 S70 V70) - Santech 3545586 from FCP which are green in color and go for $0.29 each. In comparing the Santech o-rings with the supplied o-rings, it was clear that the Santech o-rings were just slightly thicker and therefore had a slightly large outer diameter. The Santech rings appear to be well made and of good quality, so I used them in joining the heater core to the pipes. They fit perfectly and I have seen zero leakage after taking the car out for a good run.

One last thing: Go to Home Depot or somewhere and get 3 mil contractor trash bags. I laid the open end of one of these under the core when I released the pipes and just let whatever came out drain into the bag. There wasn't too much, and when it stopped draining, no more came out while I was working. Afterwards, I got a funnel, cut off one bottom corner of the bag, and just returned it all to the coolant overflow tank. No draining of the radiator. No clamping hoses.

If you take your time (and remain calm) replacing the heater core in this series of V70 is really not a bad job. When I did this on my 2000 Ford Taurus, it was necessary to remove the entire dashboard and lay it on the front seats, so consider yourself lucky! ;-)
Last edited by Eddystone on Mon Sep 18, 2017 11:35 pm, edited 2 times in total.
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bmdubya1198
1998 V70 Non-Turbo/Auto
1993 945 Turbo/Auto
1999 S70 T5 Turbo/Auto
All U.S. market models.
All on the road and running.
PM me if you are near Philadelphia.
;-)

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Re: Heater Core Install 98 V70 Auto Non-Turbo

Post by bmdubya1198 » Sun Sep 17, 2017 5:16 pm

I need to take care of mine soon, just because I don't know when it was last done and don't want it to fail and leave a lake of antifreeze in my car!
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 109k
2007 XC90 V8 AWD Sport Titanium Grey/Black 165k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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Eddystone
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Eddystone

Re: Heater Core Install 98 V70 Auto Non-Turbo

Post by Eddystone » Sun Sep 17, 2017 5:47 pm

From the posts I have read, they seem to fail slowly and warn you with that distinctive smell. I just bought this car and have been trying to decide whether or not to replace the heater hoses since they look perfectly fine and are not original to the car at 150k and non-Volvo clamps. The radiator was replaced about 20k ago as were the upper and lower hoses. I am betting that the heater hoses were done at the same time because the car has been generally well cared for.
1998 V70 Non-Turbo/Auto
1993 945 Turbo/Auto
1999 S70 T5 Turbo/Auto
All U.S. market models.
All on the road and running.
PM me if you are near Philadelphia.
;-)

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wizechatmgr
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wizechatmgr

Re: Heater Core Install 98 V70 Auto Non-Turbo

Post by wizechatmgr » Sun Sep 17, 2017 6:31 pm

bmdubya1198 wrote:
Sun Sep 17, 2017 5:16 pm
I need to take care of mine soon, just because I don't know when it was last done and don't want it to fail and leave a lake of antifreeze in my car!
Lake? Seems like a small ocean at that point... =)
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

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bmdubya1198
Posts: 3614
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
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bmdubya1198

Re: Heater Core Install 98 V70 Auto Non-Turbo

Post by bmdubya1198 » Sun Sep 17, 2017 9:12 pm

wizechatmgr wrote:
Sun Sep 17, 2017 6:31 pm
bmdubya1198 wrote:
Sun Sep 17, 2017 5:16 pm
I need to take care of mine soon, just because I don't know when it was last done and don't want it to fail and leave a lake of antifreeze in my car!
Lake? Seems like a small ocean at that point... =)
Happened in my cousin's S70. Ocean is right! Don't know how he was driving it like that... yuck.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2000 S70 GLT Mystic Silver/Taupe 253k
2003 S60 2.4T Silver/Black 109k
2007 XC90 V8 AWD Sport Titanium Grey/Black 165k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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