IPD sale XeMODeX - Experts in Volvo Electronics

Get email notification of topic replies. Log in or register (free). Amazon Link Buy anything with this and it helps MVS!

Engine running temps very wide range, normal?

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

rguzz
Posts: 408
Joined: Wed Oct 07, 2015 8:41 am
Year and Model: 1996 850 turbo
Location: VA
Been thanked: 5 times

Engine running temps very wide range, normal?

Post by rguzz »

96 855t, very variable operating temps, is this normal? Long uphill climb, 36 degrees out, 200+F degrees, downhill same climb temp drops to 150 degrees, in a very few minutes. Gauge drops down from middle position. General cruising temps 180's, again about 40 degrees outside, pretty consistent. T stat is OEM Volvo, CTS new OEM, Nissens rad is maybe 5 years old. I assume this is all pretty normal, comments? Happy Holidays. BTW, readings are from my OBD2 reader.
ecbsykes
Posts: 1738
Joined: Sun Mar 08, 2009 3:43 pm
Year and Model: 2000 V70XC
Location: Enid, OK
Has thanked: 33 times
Been thanked: 42 times

Re: Engine running temps very wide range, normal?

Post by ecbsykes »

Once warmed up, even on long descents, the coolant shouldn't really drop below the temperature rating of the thermostat. Sounds like yours may be broken (stuck open). It's more normal for temperature variance above that rating, commensurate with load (AC, hills, weights, ambient temp, etc).
2000 V70XC - 300,000 miles as of 11 Aug 2020
Hilton Tune, 16T Turbo, Mototec 3" downpipe, Blue injectors, IPD Short Ram Filter, Snabb Intake Piping & RIP kit, do88 Intercooler, TME Dual Exhaust, HID Projectors, R Panels, do88 Silicone Hoses
rguzz
Posts: 408
Joined: Wed Oct 07, 2015 8:41 am
Year and Model: 1996 850 turbo
Location: VA
Been thanked: 5 times

Re: Engine running temps very wide range, normal?

Post by rguzz »

I've been away from the car for a few months and don't recall these fluctuations in the past. Temp gauge always has been in the middle, with no memory of it ever dropping below that.T stat is maybe 2-3 years old, max. OEM Volvo. Heat appears somewhat to be erratic and dependent on what kind of driving I'm doing, ie warmer when I'm on a long, hard drive. Sounding more like a bad thermostat, doesn't it.
polskamafia mjl
Posts: 2631
Joined: Wed Apr 01, 2009 1:10 am
Year and Model: 1995 Volvo 854 T-5R
Location: Hershey, PA
Has thanked: 10 times
Been thanked: 9 times

Re: Engine running temps very wide range, normal?

Post by polskamafia mjl »

For sure, if its getting so low that its affecting blower temp then its definitely a stuck thermostat.
'All my money is gone and I have an old Volvo.' - Bamse's Turbo Underpants

Current: 1995 Volvo 850 T-5R Manual - Bringing it back from the brink of death
Previous: 1996 Volvo 850 GLT - Totaled
User avatar
bmdubya1198
Posts: 4334
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
Has thanked: 45 times
Been thanked: 182 times

Re: Engine running temps very wide range, normal?

Post by bmdubya1198 »

One more for a bad thermostat... the heat being affected is almost a dead giveaway, given the other issues.
'00 V70R Venetian Red/Charcoal M56 Swapped 199k
'03 S60 2.4T Silver/Black 117k
'07 XC90 V8 AWD Sport Titanium Grey/Black 174k
'91 944 Turbo Dark Green/Beige 175k
'92 245 Base White/Beige 249k
'99 BMW 528i
'01 Mountaineer 5.0
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
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
User avatar
abscate
MVS Moderator
Posts: 22573
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 377 times
Been thanked: 1182 times

Re: Engine running temps very wide range, normal?

Post by abscate »

My 1999 sits at 87C coolant temp while driving, at idle it will cycle between 87c and 105c as the engine heats up, radiator fan comes on, temp goes back, Maybe 2-3 minutes to creep up,then 30-60 seconds to come back down.

The temp gauge isn’t a precision device.

I logged the temp vs tick mark positions on one of my cars in a thread, it basically a

Cold - correct- Overheat measurement device
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary
User avatar
RickHaleParker
Posts: 4721
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 606 times

Re: Engine running temps very wide range, normal?

Post by RickHaleParker »

Thermostat response time is slow. Replace Thermostat before it gets really bad and does damage.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
rguzz
Posts: 408
Joined: Wed Oct 07, 2015 8:41 am
Year and Model: 1996 850 turbo
Location: VA
Been thanked: 5 times

Re: Engine running temps very wide range, normal?

Post by rguzz »

Thanks, will do, absolutely. Disappointed in life of the last replacement. I do carry a spare, time to fish it out. Have a great holiday, everyone.
User avatar
RickHaleParker
Posts: 4721
Joined: Mon May 25, 2015 2:30 pm
Year and Model: See Signature below.
Location: Kansas
Has thanked: 3 times
Been thanked: 606 times

Re: Engine running temps very wide range, normal?

Post by RickHaleParker »

rguzz wrote: Thu Dec 26, 2019 7:40 am Disappointed in life of the last replacement.
What brand did you use and where did you source it?
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
rguzz
Posts: 408
Joined: Wed Oct 07, 2015 8:41 am
Year and Model: 1996 850 turbo
Location: VA
Been thanked: 5 times

Re: Engine running temps very wide range, normal?

Post by rguzz »

Volvo OEM as seen in this video. Mine broke in exactly the same way. Replaced it today with a Wahler, whose internals appear much more robust. Maybe Volvo should no longer be the go to for thermostats anymore. 2 years for me. Looks like a design flaw.
Post Reply
  • Similar Topics
    Replies
    Views
    Last post