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Thermostat failure

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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Roger_850T
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Roger_850T

Thermostat failure

Post by Roger_850T » Sat Nov 16, 2019 10:13 pm

I had the thermostat fail on my 850T. It gave the usual symptoms - failure to warm up much. It would warm up, just in 45 minutes, and would be giving me heat by the time I got to work.

I finally got the replacement part, and found that rather than the wax failing (as expected), the bracket holding the element had actually broken. I haven't seen one fail this way before, so I thought I'd share.
IMG_1576.JPG
Roger
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'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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abscate
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abscate

Re: Thermostat failure

Post by abscate » Sun Nov 17, 2019 6:03 am

Which brand thermostat was that Roger?


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Roger_850T
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Year and Model: 854T 1995
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Roger_850T

Re: Thermostat failure

Post by Roger_850T » Sun Nov 17, 2019 10:46 am

abscate wrote:
Sun Nov 17, 2019 6:03 am
Which brand thermostat was that Roger?
That was a Volvo thermostat. (Says Volvo on the bottom, and Wahler on the top.)

To not be too hard on Volvo, it may be that it's never been changed. I checked my records, and while I replaced hoses and coolant along the way, I didn't explicitly write down that I changed the thermostat. On the one hand, I can't imagine that I didn't, but on the other hand, I'm usually pretty good at writing these things down in the log. So, it's possible it has >300k miles on it. :o

Roger


'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...

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erikv11
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Re: Thermostat failure

Post by erikv11 » Sun Nov 17, 2019 10:58 am

They all will eventually break, you're not being too hard on it. Good news it broke open, like they are supposed to.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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