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<blockquote data-quote="pollyp" data-source="post: 633626" data-attributes="member: 4527"><p>went to partco and asked for a 92C thermo for a 97 volvo s90.</p><p>£13 and it fitted the spare housing.</p><p></p><p>[ATTACH=full]39140[/ATTACH] </p><p></p><p>so here's a motorad 92C thermo kit</p><p></p><p>[ATTACH=full]28154[/ATTACH]</p><p></p><p>has a bleed valve and this odd looking end piece, dunno what its for</p><p></p><p>[ATTACH=full]29964[/ATTACH]</p><p></p><p>fits the housing perfectly</p><p></p><p>[ATTACH=full]39143[/ATTACH] </p><p></p><p>that end flange is close to the housing. once the thermo opens backwards it could touch the sides.</p><p></p><p>[ATTACH=full]39138[/ATTACH] </p><p></p><p>motorads site shows it's actually a sprung loaded valve so when the thermostat opens, it shuts the coolant return port, forcing the coolant to flow through the rad rather than back to the pump</p><p></p><p></p><p></p><p>so it can be removed</p><p></p><p>[ATTACH=full]39141[/ATTACH] </p><p></p><p>inside it says 91C/195F</p><p></p><p>[ATTACH=full]39139[/ATTACH] </p><p></p><p>lets first test it beforehand.</p><p>I place it in a bowl and pour boiled water into it with thermometer starting at 95C but the valve hardly budged, huh? is this broken? tried again and still no response since the moment I poured boiling water in :/</p><p>so rang partco asking if I can change it for another thermo such as a Cherokee but have to wait till monday cos other suppliers shut.</p><p></p><p>bah, ok lets try again but this time gradually heat it up and keep it at boiling point on a stove.</p><p></p><p>[media=youtube]ICGbFRPJGqo[/media]</p><p></p><p>you can see the temps go up to max 100C boiling, water now vapourises as steam rather than getting hotter.</p><p>turn flame off to stop the bubbling and see the thermostat and it's clearly fully open now.</p><p></p><p>OK so it does work but now learned the wax in the thermostat has a slow response time so has to be gradually brought upto and beyond its marked temp rather than flash heated before it begins to open.</p><p></p><p>as the temps drop, it begins to close at 95C and fully shut at 92C therefore it has a operating window of 92-95C.</p><p></p><p>now I cut the end copper off to remove that flange</p><p></p><p>[ATTACH=full]29962[/ATTACH] [ATTACH=full]39142[/ATTACH]</p><p></p><p>trim the rest of the copper off. looks like this additional valve closing feature is just pressed over the thermostat body.</p><p></p><p>[ATTACH=full]39144[/ATTACH] </p><p></p><p>and clears the housing much better</p><p></p><p>[ATTACH=full]28155[/ATTACH]</p><p></p><p>normal genuine nissan 82C thermo with the 92C thermo</p><p></p><p>[ATTACH=full]39135[/ATTACH] [ATTACH=full]39136[/ATTACH] [ATTACH=full]29963[/ATTACH]</p><p></p><p>fitted</p><p></p><p>[ATTACH=full]39137[/ATTACH] </p><p></p><p>once the sealants dried n filled up, lets see how it performs and if the cylinders improve <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite18" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p></blockquote><p></p>
[QUOTE="pollyp, post: 633626, member: 4527"] went to partco and asked for a 92C thermo for a 97 volvo s90. £13 and it fitted the spare housing. [ATTACH=full]39140[/ATTACH] so here's a motorad 92C thermo kit [ATTACH=full]28154[/ATTACH] has a bleed valve and this odd looking end piece, dunno what its for [ATTACH=full]29964[/ATTACH] fits the housing perfectly [ATTACH=full]39143[/ATTACH] that end flange is close to the housing. once the thermo opens backwards it could touch the sides. [ATTACH=full]39138[/ATTACH] motorads site shows it's actually a sprung loaded valve so when the thermostat opens, it shuts the coolant return port, forcing the coolant to flow through the rad rather than back to the pump so it can be removed [ATTACH=full]39141[/ATTACH] inside it says 91C/195F [ATTACH=full]39139[/ATTACH] lets first test it beforehand. I place it in a bowl and pour boiled water into it with thermometer starting at 95C but the valve hardly budged, huh? is this broken? tried again and still no response since the moment I poured boiling water in :/ so rang partco asking if I can change it for another thermo such as a Cherokee but have to wait till monday cos other suppliers shut. bah, ok lets try again but this time gradually heat it up and keep it at boiling point on a stove. [media=youtube]ICGbFRPJGqo[/media] you can see the temps go up to max 100C boiling, water now vapourises as steam rather than getting hotter. turn flame off to stop the bubbling and see the thermostat and it's clearly fully open now. OK so it does work but now learned the wax in the thermostat has a slow response time so has to be gradually brought upto and beyond its marked temp rather than flash heated before it begins to open. as the temps drop, it begins to close at 95C and fully shut at 92C therefore it has a operating window of 92-95C. now I cut the end copper off to remove that flange [ATTACH=full]29962[/ATTACH] [ATTACH=full]39142[/ATTACH] trim the rest of the copper off. looks like this additional valve closing feature is just pressed over the thermostat body. [ATTACH=full]39144[/ATTACH] and clears the housing much better [ATTACH=full]28155[/ATTACH] normal genuine nissan 82C thermo with the 92C thermo [ATTACH=full]39135[/ATTACH] [ATTACH=full]39136[/ATTACH] [ATTACH=full]29963[/ATTACH] fitted [ATTACH=full]39137[/ATTACH] once the sealants dried n filled up, lets see how it performs and if the cylinders improve :cool: [/QUOTE]
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