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Replaced thermostat- no heat, perfect engine temp

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cn90
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Post by cn90 »

What is the brand name of the tstat assembly?
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+
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TisMe
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Post by TisMe »

cn90 wrote: 29 Apr 2024, 11:16 What is the brand name of the tstat assembly?
Volvo 31293700
jonesg wrote: 29 Apr 2024, 01:10 Grab the heater hoses at the firewall, if they are hot when engine is up to temp its not the thermostat, its the plenum door actuators in the dash.
Another pro tip, thank you jonesg. That would mean a compromised heater core, opposed to trapped air, yes?

Wish I took the time to diagnose further today, but I did not. If the "plenum door actuators" of the heater core check out, then I'll have to assume I flagged a maintenance gremlin and messed up some standard maintenance... aka did not burp the system properly.

I look forward to laughing at myself about this once if it turns out to be air in the core :D vehicles are excellent at offering lessons in humility, and in my case, those lessons surface most when I lose patience due to having to do the work twice.
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BlackBart
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Post by BlackBart »

I share this experience.

Just as a data point, my Black Betty the P2 makes heat RIGHT NOW, even in cold weather. I’ve always been impressed. Our Audi A4 took forever - you’d arrive and it was still blowing cold air on your feet.
ex-1984 245T wagon
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matthew1
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Post by matthew1 »

Yep my P2 and P80 cars were fast to get to heat. My 2017 VW is slow.
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jonesg
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Post by jonesg »

BlackBart wrote: 30 Apr 2024, 09:59 I share this experience.

Just as a data point, my Black Betty the P2 makes heat RIGHT NOW, even in cold weather. I’ve always been impressed. Our Audi A4 took forever - you’d arrive and it was still blowing cold air on your feet.
my ford contour took 30 minutes to heat up, the drive to work was 25 minutes.
v70 takes 1/4 mile .
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jonesg
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Post by jonesg »

TisMe wrote: 29 Apr 2024, 19:13
cn90 wrote: 29 Apr 2024, 11:16 What is the brand name of the tstat assembly?
Volvo 31293700
jonesg wrote: 29 Apr 2024, 01:10 Grab the heater hoses at the firewall, if they are hot when engine is up to temp its not the thermostat, its the plenum door actuators in the dash.
Another pro tip, thank you jonesg. That would mean a compromised heater core, opposed to trapped air, yes?

more likely to be the actuator / doors but it could be the core too.
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