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How fast should the thermostat open?
- Gerula
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08 Dec 2015 12:56 #158096
by Gerula
How fast should the thermostat open? was created by Gerula
As it happens when you start doing small repairs yourself, you end up with the "maybe I should also do this" syndrome :laugh:
So I started to wonder if the thermostat in my Jimny (G13BB engine) isn't opening a bit slow. With outside temperatures just above freezing, it needs a full 5 min drive (town) to get the dash temp gauge in mid-level position and maybe another 2 mins to get the heater to blow hot air. That happens in the morning with a cold engine.
I'm thinking that it should be able to deliver hot air inside the cabin much faster? What is your experience in similar outdoor temperatures?
So I started to wonder if the thermostat in my Jimny (G13BB engine) isn't opening a bit slow. With outside temperatures just above freezing, it needs a full 5 min drive (town) to get the dash temp gauge in mid-level position and maybe another 2 mins to get the heater to blow hot air. That happens in the morning with a cold engine.
I'm thinking that it should be able to deliver hot air inside the cabin much faster? What is your experience in similar outdoor temperatures?
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- Gerula
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08 Dec 2015 14:03 #158099
by Gerula
Replied by Gerula on topic How fast should the thermostat open?
Problem is that it's not very cold now
, this morning I had about 5 degrees Celsius outside my house .
On other cars I've had I remember that the engine temperature was rising quite faster, maybe 2-3 minutes in late November - early December, when outside temperature was a few degrees above freezing.
All this with cabin radiator closed, of course.

On other cars I've had I remember that the engine temperature was rising quite faster, maybe 2-3 minutes in late November - early December, when outside temperature was a few degrees above freezing.
All this with cabin radiator closed, of course.
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- Gerula
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08 Dec 2015 15:36 #158106
by Gerula
Replied by Gerula on topic How fast should the thermostat open?
I said "on other cars I've had"
(which is a lot of cars during the last 25 years).
When was the last time you changed the thermostat? Yours may be on it's way out as well, 5 mins when outside temp is 20 C seems a lot.

When was the last time you changed the thermostat? Yours may be on it's way out as well, 5 mins when outside temp is 20 C seems a lot.
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08 Dec 2015 16:24 #158108
by Gerula
Replied by Gerula on topic How fast should the thermostat open?
Thank you, this means that on the 88 C thermostat it would be normal to see the gauge get to working temperature in about 5 minutes.
If others have different experiences please share
If others have different experiences please share

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09 Dec 2015 01:25 #158152
by kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
Replied by kirkynut on topic How fast should the thermostat open?
My 2000 twin cam warms up pretty quickly and is quite warm within a few miles to 89'c which it sits at for most of the time unless under strain on a long motorway hill when it might creep to 94'c.
I have a scangauge so can monitor it to the degree.
Kirkynut
I have a scangauge so can monitor it to the degree.
Kirkynut
The underdog often starts the fight, and occasionally the upper dog deserves to win - Edgar Watson Howe.
My Jimny Thread Here: www.bigjimny.com/index.php/forum/8-my-ji...on-continues?start=0
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09 Dec 2015 08:10 - 09 Dec 2015 08:12 #158161
by Busta
Replied by Busta on topic How fast should the thermostat open?
Mine starts blowing hot air before the gauge gets to the middle. I'd say hot air in 3 minutes, gauge levels out at 5 minutes. That's a M13a, driving straight onto fast country roads. 5 minutes doesn't sound preposterous though. Ever driven a Landrover Defender? By the time the heater starts to work it's summer again.
Last edit: 09 Dec 2015 08:12 by Busta.
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