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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Wild water temp readings

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Old Jul 18th, 2019, 16:09   #11
Ron Kwas
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sl;

"stationary at tickover, the gauge quickly rises to the top of the green. When I rev the engine (still with the car stationary), the needle quickly falls back to normal. I don't even know, is this normal? "...this is actually quite typical, and nothing to be concerned about, due to a combination of low airflow through Radiator, and slow circulation by the Water Pump, so don't suspect it just yet.

If your Cooling System is free of air and Temp Gauge is working normally so that you can trust it, you can just monitor it, and take note of any changes in the action.

Clan already touched upon the Instrument VStab as a possible reason for hot indication, and this seems not to be an issue here, but it bears repeating to make you fully aware of this important component...your car has one of these supplying several instruments, and you might/should be interested in reading about it and the indication errors it can cause. See: https://www.sw-em.com/voltage_stabilizer.htm
and https://www.volvoforums.org.uk/showthread.php?t=284381 ...and read about Graham W's experience!

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Old Jul 18th, 2019, 16:20   #12
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Originally Posted by sleek lemur View Post
Thanks, Clan. I was actually told that 88 degree thermostat was too hot for UK summer and should swap for 77, which I did. Engine oil is nice and clean. No oil in water.

Using original fan, yes.

Sine the problem only occurs at tickover, am suspecting water pump. The engine has been rebuilt, but since owning the car, I have found a few corners that have been cut.

But I'd certainly prefer to investigate any other possibilities.
92 was used by volvo for UK back in the 70's, 77 is too cold for any internal combustion engine in the UK ... lowering the thermostat temperature will not cure your underlying fault ..
Have you a volvo water pump on it or a motor factor one?
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Old Jul 18th, 2019, 16:46   #13
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Thank you Ron and Clan. Ron, I will read those links right now with interest!

Water pump looks new from the outside at least. Car was restored by specialists DK Classic Cars in Denmark. They do seem to know the cars very well and overall I've been happy, although they have committed a few howlers and clearly did not test drive the car much. I did suspect the water pump. An extra few hundred revs at standstill certainly brings the temp right down.

Clan, the 77 degree thermostat was recommended by my local Volvo Amazon specialist and sold by Brookhouse in Ipswich. According to the gauge, it has the car running at spot-on the correct temp.

Thanks again! I feel I'm making progress.
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Old Jul 18th, 2019, 16:50   #14
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Thank you Ron and Clan. Ron, I will read those links right now with interest!

Water pump looks new from the outside at least. Car was restored by specialists DK Classic Cars in Denmark. They do seem to know the cars very well and overall I've been happy, although they have committed a few howlers and clearly did not test drive the car much. I did suspect the water pump. An extra few hundred revs at standstill certainly brings the temp right down.

Clan, the 77 degree thermostat was recommended by my local Volvo Amazon specialist and sold by Brookhouse in Ipswich. According to the gauge, it has the car running at spot-on the correct temp.

Thanks again! I feel I'm making progress.

I think if it were me i would get the water pump off and have a look at the impeller . and fit a 92 C thermostat , it is in the car's best interest . There is no advantage at all in using a 77 C thermostat but plenty of disadvantages as explained above ..

It might be useful to take the thermostat out and see if you get the same problem , it could be a faulty thermostat .
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Old Jul 18th, 2019, 17:08   #15
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if checking 'stat, push open and insert a piece of cotton.Suspend in a pan of water with a thermometer in it and heat up. Note at which temp' the 'stat opens and falls of the thread.
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Old Jul 18th, 2019, 18:18   #16
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Stat seems fine. I witnessed it opening when I had the rad cap off when I was bleeding the system.

Arcturus, I am loathe to change the thermostat, as the car is holding the correct temp, except when ticking over. How annoying for you to give advice and have me ignore it! The water pump is an avenue I should check out.

Thank you!
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Old Jul 18th, 2019, 18:36   #17
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No problem, it's general advice. It's how I test my 'stats.
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Old Jul 19th, 2019, 08:12   #18
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Water pumps can have a cast impeller or a stamped (from sheet metal)impeller.

Typically the OEM pump has a cast impeller and the aftermarket ones are stamped.

Cast impeller is know to provide better circulation at idle. So the only way to check your pump is to remove it.

Bit of a job, but might be the answer if you have a stamped impeller in there.
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Old Jul 19th, 2019, 12:00   #19
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That's really useful, C. Thank you.
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Old Jul 19th, 2019, 13:01   #20
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The 88 and 92º thermostats weren't used by Volvo until the 240 came in with the B21/23. B18/20/30 used either 77 or 82º. Back in ye olde days, it was normal to change between the 2 temps for summer and winter along with different single weight oils. A cash cow for the garages, although the frequent oil changes didn't do the engines any harm. Multigrade oils changed all that and depending on where you lived, changing the thermostat also happened less often. An 82º thermostat is fine. If you overheat you have other problems, likely a clogged up radiator, or easier to fix, poor sealing rad caps. Yes. the water pumps with the cast impellors are a bit more efficient than the pressed steel ones at idle but when driving the difference is negligible. Again, if there is a problem, check the rad. B18 engines with the alcohol expansion temp gauges will show the temps rising for a while after you switch off the engine due to heat soak. B20 with the electric gauge will also heat soak but the gauge will go back to zero when you switch off.
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