|
PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
Information |
|
Wild water temp readingsViews : 3145 Replies : 52Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Jul 18th, 2019, 16:09 | #11 |
Premier Member
Last Online: Today 09:52
Join Date: Jul 2007
Location: Connecticut, USA
|
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! Cheers |
The Following User Says Thank You to Ron Kwas For This Useful Post: |
Jul 18th, 2019, 16:20 | #12 | |
Experienced Member
Last Online: Today 01:00
Join Date: Jun 2007
Location: L/H side
|
Quote:
Have you a volvo water pump on it or a motor factor one?
__________________
My comments are only based on my opinions and vast experience . |
|
Jul 18th, 2019, 16:46 | #13 |
Senior Member
Last Online: Dec 29th, 2022 12:47
Join Date: Jun 2019
Location: Thorndon, near Eye, Suffolk, England
|
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. |
Jul 18th, 2019, 16:50 | #14 | |
Experienced Member
Last Online: Today 01:00
Join Date: Jun 2007
Location: L/H side
|
Quote:
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 .
__________________
My comments are only based on my opinions and vast experience . |
|
Jul 18th, 2019, 17:08 | #15 |
arcturus
Last Online: Today 09:21
Join Date: Mar 2006
Location: Sagres Portugal
|
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.
__________________
life's too short to drink bad wine |
Jul 18th, 2019, 18:18 | #16 |
Senior Member
Last Online: Dec 29th, 2022 12:47
Join Date: Jun 2019
Location: Thorndon, near Eye, Suffolk, England
|
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! |
Jul 18th, 2019, 18:36 | #17 |
arcturus
Last Online: Today 09:21
Join Date: Mar 2006
Location: Sagres Portugal
|
No problem, it's general advice. It's how I test my 'stats.
__________________
life's too short to drink bad wine |
Jul 19th, 2019, 08:12 | #18 |
Master Member
Last Online: Mar 26th, 2024 23:41
Join Date: Oct 2013
Location: Alberta
|
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. |
Jul 19th, 2019, 12:00 | #19 |
Senior Member
Last Online: Dec 29th, 2022 12:47
Join Date: Jun 2019
Location: Thorndon, near Eye, Suffolk, England
|
That's really useful, C. Thank you.
|
Jul 19th, 2019, 13:01 | #20 |
VOC Member
Last Online: Yesterday 14:34
Join Date: Jul 2006
Location: Chatham
|
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.
|
The Following User Says Thank You to Derek UK For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Display Modes | |
|
|