daverclasper Posted April 16, 2021 Report Share Posted April 16, 2021 Hi. looked online but no clues with stat in situ. Wondered if to remove filler cap, start car (when cold) and if coolent movement in top of rad, then suggests stat is stuck open?. Any other tips?. Cheers, Dave Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 16, 2021 Report Share Posted April 16, 2021 That will work as the coolant will flow into the rad from cold. Why do you suspect it's stuck open? Car not warming up? Link to comment Share on other sites More sharing options...
daverclasper Posted April 16, 2021 Author Report Share Posted April 16, 2021 Yes. Seems to be taking ages, and generally running cooler, I think, though may have coincided with me finally getting the system to pressurise, as now is holding almost a litre more coolent (though could have a dodgy stat for a while as well, I assume). Link to comment Share on other sites More sharing options...
GrahamB Posted April 16, 2021 Report Share Posted April 16, 2021 If you run the engine with the cap on, the top of the radiator will remain cool then suddenly get hot when the engine is up to temperature and thermostat opens. That is what I have observed with my cooling system. If the temperature of the top of the radiator gradually gets warmer, that would indicate that the thermostat is stuck open. 2 Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 17, 2021 Report Share Posted April 17, 2021 run at idle with the rad cap off you will see the coolant rush over the top tubes and ebb and flow as the stat modulates the flow there will be no flow while its closed but the stat opens and closes or partially closes every few seconds its not just open or closed and if removed for testing you are not boiling an egg they are a very sensitive little unit , we had a test tank for them which circulated the water and raised it in 0,1C increments and plotted the opening it all gets quite techy so if in doubt testing at home wont prove much just replace it make sure it has a jiggle pin air bleed in the rim to aid refilling . Pete Link to comment Share on other sites More sharing options...
Mathew Posted April 17, 2021 Report Share Posted April 17, 2021 Think i would just buy a new one with gasket and change. For 10 pounds or less and half an hours work , which includes going to and from the garage. If in doubt rule out. If it is sticking open you run cool but if it fails closed you overheat. Change it , if you still have the problem your 95 percent sure its not that. If it goes away job done. 1 Link to comment Share on other sites More sharing options...
Nigel Clark Posted April 18, 2021 Report Share Posted April 18, 2021 On 17/04/2021 at 08:20, Mathew said: Think i would just buy a new one with gasket and change. For 10 pounds or less and half an hours work , which includes going to and from the garage. If in doubt rule out. If it is sticking open you run cool but if it fails closed you overheat. Change it , if you still have the problem your 95 percent sure its not that. If it goes away job done. +1 That's exactly what I would do. Thermostats don't last forever, they're almost a service item. Nigel 1 Link to comment Share on other sites More sharing options...
SpitFire6 Posted April 18, 2021 Report Share Posted April 18, 2021 I would fit the highest temperature one I could find. Add a small breather hole if not present to aid air removal. Link to comment Share on other sites More sharing options...
daverclasper Posted April 19, 2021 Author Report Share Posted April 19, 2021 Thanks folks 22 hours ago, SpitFire6 said: I would fit the highest temperature one I could find. Interested in why, as no info given. Cheers, Dave Link to comment Share on other sites More sharing options...
Mathew Posted April 19, 2021 Report Share Posted April 19, 2021 Go for 82 deg. If too cool 88 if too hot 74. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 19, 2021 Report Share Posted April 19, 2021 a hotter engine can run on weaker mixtures most 70/80s cars on carbs raised the temperature to 88c to help get "lean burn" as they called it who remembers Avengers with a near white exhaust pipe , as for triumphs there are 3 there is no winter /summer but but based on countries climate ( in most parts lists ) 74 C hot climates ( not just hot uk summers) 82C std uk/ European spec 88C colds climates ( not a smidge of UK snow) and later models like 1500 spit < onwards with leaner running and more emission controls or there abouts and if you fit a 88c to a 82c car the temp gauge will be nearer the red than mid way ...and many are paranoid about that anyway supposed overheating is a common trend on here Pete 1 Link to comment Share on other sites More sharing options...
Mathew Posted April 19, 2021 Report Share Posted April 19, 2021 1 hour ago, Pete Lewis said: and if you fit a 88c to a 82c car the temp gauge will be nearer the red than mid way ...and many are paranoid about that anyway supposed overheating is a common trend on here Pete Guilty as charged Link to comment Share on other sites More sharing options...
SpitFire6 Posted April 19, 2021 Report Share Posted April 19, 2021 2 hours ago, daverclasper said: Thanks folks Interested in why, as no info given. Cheers, Dave Hi Dave, My reasoning is better in the winter as cabin is warmer & in the summer the heat rejection is greater as the delta/difference across the radiator is greater. Once its open it is open. Cheers. Iain. 1 Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 20, 2021 Report Share Posted April 20, 2021 13 hours ago, Pete Lewis said: as for triumphs there are 3 there is no winter /summer but but based on countries climate ( in most parts lists ) 74 C hot climates ( not just hot uk summers) 82C std uk/ European spec 88C colds climates ( not a smidge of UK snow) and later models like 1500 spit < onwards with leaner running and more emission controls or there abouts and if you fit a 88c to a 82c car the temp gauge will be nearer the red than mid way ...and many are paranoid about that anyway Temperature gauge? What's that? It's a sign of how things have changed; back in the day drivers worried about how warm the car was running... now they worry about how cold the driver is. You were meant to change the thermostat for Summer / Winter but these days, with a lot of our cars being Summer use only, fit an 82 and just leave it all year round. Now I'm going to have to go and check mine... Link to comment Share on other sites More sharing options...
Clive Posted April 20, 2021 Report Share Posted April 20, 2021 Temp gauges on modern cars (90s onwards?) are not like our cars. They are controlled by teh ecu, and will read "normal" over a wide range of temps to avoid panicking drivers, and reassure them their car is not overheating. On our cars drivers have a meltdown if the gauge goes much over normal. I like modern cars with simple warning light for overheating, less to worry about. My spitfire temp sensor got nudged and the terminals broke. It sat at 1/4 for normal driving, and the rad fan came on when it read 1/2, 92 degrees. The first new sender, supposedly "oem equivalent" read 1/4 before the engine went on , and went full scale in minutes. Bin and refunded. Found another after a recommendation, it reads 1/3rd normal driving and 2/3 when the fan comes on, so a tad more accurate. But is meant for a rover SDI. I may investigate other senders if I see them cheap.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 20, 2021 Report Share Posted April 20, 2021 My Cactus 130 has speedo and fuel gauge thats it ,surprising how you soon get used to having no worry gauges to glance at keeps life simple theres some benefits in that Pete Link to comment Share on other sites More sharing options...
Mathew Posted April 20, 2021 Report Share Posted April 20, 2021 No worry guages, like the glasses that turn black when there is danger in the hitch hikers guide to the galaxy? Link to comment Share on other sites More sharing options...
Badwolf Posted April 20, 2021 Report Share Posted April 20, 2021 2 hours ago, Mathew said: No worry guages, like the glasses that turn black when there is danger in the hitch hikers guide to the galaxy? 'Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses' ...wonderful things. I wonder if you can get a windscreen made using the same technology? Link to comment Share on other sites More sharing options...
Mathew Posted April 20, 2021 Report Share Posted April 20, 2021 6 minutes ago, Badwolf said: 'Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses' ...wonderful things. I wonder if you can get a windscreen made using the same technology? Linked to my ejector seat button on the 2500s 1 Link to comment Share on other sites More sharing options...
SpitFire6 Posted April 20, 2021 Report Share Posted April 20, 2021 Hi, I will fit a water temperature gauge one day. hands and sense of smell will do for now. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 22, 2021 Report Share Posted April 22, 2021 Just listen for hissing and watch for steam at junctions. I've been out looking for a thermostat for the Herald in my stash of parts... and seem to have everything but 82. Quite a few 88s, one 70, one 72, one quite rusty 82 and the highest so far has been 94. I know I bought the 70 as an early thermostat advertised for a Herald - yes it fits but the vendor never mentioned the temperature! - but no idea where the others came from over the years. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 22, 2021 Report Share Posted April 22, 2021 crikey 94c time for tea then Pete Link to comment Share on other sites More sharing options...
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