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Volvo 340 Thermostat

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Old Jul 17th, 2015, 21:36   #1
M4rk
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Default Volvo 340 Thermostat

I have a bit of a strange issue with my Volvo 340 (1.4l), a month back I started my car it sounded like a squeaky belt, however it stopped after a few meter, on the way I noticed the engine wasn't reaching it's normal temperature, when I was stopping the temperature was increasing again to normal etc. So my thought was it the thermostat, change it and it was alright up to now, again the same issue, a very, very slight squeaky noise (stopping after a few min again) and believe the thermostat failed again. The cooling system was before clean, and I cleaned and refilled it before, so I son't believe it's the issue... can't believe it's the water pump ether (but not sure). Has anyone an idea what the issue could be? Thanks.
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Old Jul 17th, 2015, 22:48   #2
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I have a bit of a strange issue with my Volvo 340 (1.4l), a month back I started my car it sounded like a squeaky belt, however it stopped after a few meter, on the way I noticed the engine wasn't reaching it's normal temperature, when I was stopping the temperature was increasing again to normal etc. So my thought was it the thermostat, change it and it was alright up to now, again the same issue, a very, very slight squeaky noise (stopping after a few min again) and believe the thermostat failed again. The cooling system was before clean, and I cleaned and refilled it before, so I son't believe it's the issue... can't believe it's the water pump ether (but not sure). Has anyone an idea what the issue could be? Thanks.
All the 340's i have seen in the last 20 years have a gauge that only goes up to about 40% of scale when warm , the senders in the head/waterpump are getting old and have high reistance . It is normal for the temperature to go up a bit when stopped , then the fan should come on ...
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Old Jul 17th, 2015, 23:52   #3
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All? In the last 20 years?

There are good ones out there that work properly
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Old Jul 18th, 2015, 20:31   #4
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All? In the last 20 years?

There are good ones out there that work properly
Not so sure these days ! ok who has a good working temp gauge on a 300 series which points verticaly within 10 minutes of driving away from cold?

I have about 7 or 8 340 temperature senders from 1980 to 1990 cars, single and twin connector ones which i have changed , upon cutting them open there is corrosion where the spring terminal presses on the temperature sensitive pellet in the bottom of the sensor ..hence the higher resistance/lower needle reading than should be. I am wondering if the cheap E-Bay sensors work?
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Old Jul 19th, 2015, 21:23   #5
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I had an Isodrop sensor (single terminal) for a Smiths that worked well, but managed to find a NOS Smiths two terminal one so the gauge would read correctly.


Smiths temperature sender by macplaxton, on Flickr


DSCF1317 by macplaxton, on Flickr

As discussed many moons ago here: http://www.volvoforums.org.uk/showthread.php?t=136916
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Last edited by macplaxton; Jul 19th, 2015 at 21:27.
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