Question about 1990 Chevrolet K1500

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I get air in my rad when i change my antifreeze how can i get the air out

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THE AIR WILL COME OUT BY IT SELF DRAIN THE SYSTEM PUT THE NEW THE AIR WILL KEEP COME UP ONCE IT STOPS START THE ENGINE AND LET IT RUN UNTIL THE THEROSTAT OPENS THEN IT WILL **** MORE COOLANT IN WHEN YOU ARE ALL DO FILLING IT AND READY TO PUT THE CAP ON REV THE ENGINE UP TP ABOUT 2000 RPM AND THE FLUID WILL GO DOWN SOME MORE WITH IT HELD TO 2000 RPM TOP IT OFF AND PUT THE CAP ON FILL YOUR OVERFLOW TANK AND YOU ARE DONE

Posted on Oct 14, 2010

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No heat heater hoses cold antifreeze was changed and so was the thermostat


run the car with rad cap off too bleed the air air pocket in system that is why both heater hoses are cold

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Follow top rad hose to the housing remove two bolts on housing that the hose attaches to after removing rad hose on engine side, pop housing off and change thermostat. Once changed reverse procedure start vehicle with cap off filling antifreeze watching your temp guage and wait for the fans to come on to work air locks out of system. Once fans have cycled and level has dropped you should have good heat and be able to cap your rad. DONE! Be careful not to get burned!

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I just installed a thermostat in my 2000 lincoln ls and now the heater and defrost dont work. heater just blows out cool air


make sure you installed the themostat the right way and that it has the proper heat range for your vechicule.normally after installing a thermostat,you remve the rad cap and fill the radiator with antifreeze,then srart the car and wait till the themostat opens and prestone level falls.refill rad and put rad cap back on.turn on heater and you should have heat,if not have your rad cap tested to make sure it is holding the proper pressure.your antifreeze mixture should be 50\50.

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Heater blows cold when car goes down to a idle and warms up when it is driving. I have changed thermostat and there appears to be no antifreeze leaks


It's possible you may have a air lock in the system, try letting it run with the rad cap off until the ele fan comes on, you may loose some coolant as the air comes out of the rad fill hole so be sure to stay clear as you don't want any hot coolant on you. when the fan comes on the level of coolant will go down as the t-stat is open then you can fill with more coolant and have no air locks. then repalce the rad cap and try that. Another item could be a partialy blocked heater core.

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Changed the thermostat put in antifreeze and still no heat


Could be a air lock in you lines, did you get all the air out of the system? you can do this by parking on a sloped grade ie driveway or road, then open your rad cap (carefull could be hot it is easier to do cold) this will allow any air bubble or pockets trapped in your lines to rise to the surface at the rad and escape.

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How to Change a Thermostat in a 1999 Oldsmobile silhouette


Hi to change your thermostat ..disconnect your battery .follow the top rad hose to you motor .where the hose connects to the top of your motor there is a thermostat under neath the thermostat housing remove rad cap ..when cool only ....drain rad ,bottom of your rad there is a bleeder . use a good leak proof container to keep antifreeze from going on the ground ...if you spill any ..make sure you wipe it all up ...it is very poisonous to small animals ect
You will have to gain access to your thermostat ,so remove all things that are in the area where the hose goes too ...the motor .First remove the hose connected to the thermostat housing ..remove thermostat housing ...usually a few bolts ....under neath there is a thermostat ....and a gasket ..once you remove the thermostat ....be sure to put the new one back the same way you took the old one out ....plug the hole with a small rag ....any extra rad fluid spilling on the motor ect ...wipe it up it is corrosive ...to wires ect
Before changing the new thermostat ...use a scraper to clean the area where the gasket sits ,put a small cloth in the whole before you clean to make sure you don't leave any dirt in the hole ...i usually use a shop vac to clean the area after i finish scraping the area ...
buy a good gasket sealant ...new thermostat should come with new gasket ....put new gasket sealant on the gasket so it will not move while trying to install the thermostat housing,be sure to line up the holes in the gasket ...to where the bolts will be installed later . Place new thermostat in then your new gasket ..in the hole .also remember to clean the thermostat housing too ...before reinstalling ....tighten bolts by hand first hand ,use a ratchet....after tightening ....tighten about a half turn ...don't over tighten ,you could break the bolts ,and it's not good to over tighten because of the new gasket also ...put back rad hose to thermostat housing tighten well ,then tighten bleeder on rad ...if you havent changed your antifreexe in some time, buy new antifreeze ..if you are not sure how to mix it ..buy pre mixed antifreeze,fill rad ,connect battery ...start motor ....set heating controls to max ...and blower to the highest setting ,keep filling rad while motor heats up ..it will bubble some ....once you feel the rad is completly filled ...put rad cap on properly ...in your resorvior where you put antifreeze in, fill it to where it should be filled too ..there is usullay a mark to tell how much it can be filled to .check inside your vehicle to see if ther effecient heat comming out your vents .it might take a few days or so for the air to come out of the rad ...ect ....also in a day ..check to see if there are any leaks ...tighten things up more if need be .....
good luck ...let me know how you make out ...
Just to let you know ...you can buy an all season thermostat so you will not have to change it every different season from summer to winter ....

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2 Answers

High temp


it sounds like an air pocket... try squeezing the rad hoses a few times and keeping an eye on the level in the rad... this is probably best done with the rad cap off... of course make sure it is cold before you remove the radiator cap.

Robert

Jan 16, 2009 | 1993 Chevrolet S-10 Blazer

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