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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Overcooling? Where does your temp gauge sit?Views : 4467 Replies : 61Users Viewing This Thread : |
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Jan 2nd, 2020, 22:34 | #21 | ||
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Quote:
Even a weal 'stat will protect the head as it restricts flow to hole in the middle of the 'stat which helps to even the temperature out. Quote:
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Jan 7th, 2020, 10:00 | #22 |
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Faulty thermostat
I remember once having a sudden drop of the temp gauge when driving on the motorway. When leaving the motorway the dial went back to normal. When I took the thermostat out I found that the little aeration plug had become wegded between the valve and housing. Appearently its hole had worn out over the years allowing the pin to move too much. All solved with a new thermostat.
In the attached picture you can just see the little pin stuck between valve and housing. Changing the thermostat is quite easy if you first drain the expansion tank with eg a syringe. No need to fully drain the system as the thermostat is quite high up and you will hardly loose any coolant. |
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Jan 7th, 2020, 12:45 | #23 | |
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Thanks, LeeP |
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Jan 7th, 2020, 14:01 | #24 |
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The thermostat has a proper sealing ring Lee, it has an internal groove that fits round the edge of the 'stat - advisable to use a smear of silicone grease on the edge of the 'stat and on the outside of the seal to help it find its water-tight position and to enable future remoal without need for slide hammers!
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Jan 7th, 2020, 16:15 | #25 |
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Wear part
It is not so much something you should look out for, but a possible explanation for the indicator to suddenly give a lower reading. A thermostat is more or less a wear part anyway, costing less than 20 GBP and quite easy to replace, so just go for a new one.
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Jan 7th, 2020, 20:35 | #26 |
bob12
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Thirty years on and still the original thermostat and water temp sensor on the 745 are working well with the temp gauge sitting nicely near the centre mark.
Only once was it really tested to the red when the back heater hose blew and, I didn't spot it until the car started to 'stutter' and steam also started to emit from the bonnet n/s edges!! Then I looked down at the gauges. That's Volvo motoring. Bob Last edited by bob12; Jan 7th, 2020 at 21:46. |
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Jan 7th, 2020, 21:20 | #27 | |
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Jan 18th, 2020, 15:12 | #28 | |
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Soaked the studs and 10mm nuts with WD40 for the last few weeks. Top one came off a treat but the bottom one rounded off despite a quality socket. Looking at it I think it was damaged when last fitted (not me). Any tips for getting the rounded nut off? Mole grips? Drill? Hacksaw? Access is not brilliant. Cheers, LeeP |
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Jan 18th, 2020, 15:49 | #29 |
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Is it possible to cut one side of the nut off with a hacksaw or mini Dremel type saw or grinder. Without damaging the thread on the stud of course. I’ve done it once a long time ago on some other ruined nut somewhere but cannot remember where or when. Once there is only a thin piece of the nut against the stud I was able to turn the nut with whatever would fit over it, spanner or mole grip. The heat generated in the process may also assist. Just a thought.
I am planning to renew my thermostat ASAP as the temp gauge is reading about 30% when it used to read 50%. Although I haven’t noticed any reduction in the heater temperature.
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Jan 18th, 2020, 16:02 | #30 | |
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Quote:
Yes, I have had a similar thought but I've seen some special "rounded nut removal"sockets on the interweb that I might have a go with first. They seem to have some sort of thread inside that bites into the nut. When you do yours I would certainly endorse soaking with WD40 for a week or two beforehand as someone on here mentioned. The uppermost nut cracked off a treat. Cheers, Leep |
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