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My 91 legend will overheat sometimes and if I turn the dial to hot or 90
degrees it will come back down. When I have it in the 60 degrees(cold) mark it will jump to hot fast? Sounds like a thermostat I think? Do you think this is right? Brand new radiator and new fluid within last month. Headgasket is fine. Does a thermostat close when in cold and open in hot postition?? Thanks!! ![]() |
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![]() " ![]() ![]() news:19767-3F5AB900-146@storefull-2278.public.lawson.webtv.net... > My 91 legend will overheat sometimes and if I turn the dial to hot or 90 > degrees it will come back down. When I have it in the 60 degrees(cold) > mark it will jump to hot fast? Sounds like a thermostat I think? Do > you think this is right? Brand new radiator and new fluid within last > month. Headgasket is fine. Does a thermostat close when in cold and > open in hot postition?? Thanks!! ![]() > Overheating is such a common problem, yet pretty easy to pinpoint and fix (in my opinion). First make sure your water pump is not leaking. Make sure the two rubber hoses are still soft and plyable and are not cracked or leaking. Flush out the radio and engine block with radiator cleaner (you've eliminated this problem by replacing it). Make sure your fans are working and kicking on. I had a car that everything worked perfect.....just the radiator fan wasn't working so when I was idling, the car would overheat...if im on the freeway....no problems. Then you wanna check your thermostat. If thats ok, you need to make sure your water is actually still working (is it pumping water?). Take off the top hose going into the top of the radiator and take a garden hose and with the engine running...."flush" the coolant system. Try reving the engine while doing this and see if you are getting water spraying out of the top hose (comming out of the engine block/thermostat). Of course empty your antifreeze and fill with water for this test. if that all checks out...sounds like you might have a damaged head gasket or an internal leak maybe (if you are loosing your coolant). If you flush your system and test like this though, you should flush your system again with a mild coolant cleaner to make sure you get all the dirty garden hose water out of there....you dont want mineral-rich water in your cooling system :-) But based on what you are saying...when you turn the heater on...the car cools down. Sounds like it could be three things (since you've already replaced your radiator). It could be your fans aren't working, your water pump is pumping water through the system fast enough (messed up pump? can test as I said above). Is could very well be a bad thermostat (I am thinking this). The thermostats should open at a specified temperature. They stay closed when cold to help the engine heat up faster in the mornings. One the water in the engine reaches a certain temp (175 F, 180 F...etc) it opens and allows for the water to flow and cool the engine. Take out your thermostat and see if it looks damaged. if it looks ok, stick it into a pot of boiling water. Pop a thermometer into the water (cooking thermometer or anything) to see the water temperature and see if the thermostat opens. if the water is rapidly boiling (water temp above 200 degrees F or so) and the thermostat hasn't opened.....thats your problem. Let us know how it goes. Gabe |
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Air in the system?
![]() ![]() news:19767-3F5AB900-146@storefull-2278.public.lawson.webtv.net... > My 91 legend will overheat sometimes and if I turn the dial to hot or 90 > degrees it will come back down. When I have it in the 60 degrees(cold) > mark it will jump to hot fast? Sounds like a thermostat I think? Do > you think this is right? Brand new radiator and new fluid within last > month. Headgasket is fine. Does a thermostat close when in cold and > open in hot postition?? Thanks!! ![]() > |
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![]() "Franz Bestuchev" <fbestuchev@n05p4m.userealsugar.com> wrote in message news:bjjjbb$me0$1@peabody.colorado.edu... > ![]() > > > I am going to try all this during this week!! Thanks VERY MUCH for your > > help!! ![]() > > > > Gabriel is to be commended, it was an extensive and thorough post > :-) Just helping out...Let us know how it goes :-) |
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So far so good. Flushed the system and am running a cleaner. Have
driven all day and no overheating. Either there was something clogged or ?? I will let you know as the next day comes along. Thanks to Gabriel and everyone else who helped!! ![]() |
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