97 thermostat change
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Senior User
Joined: Jul 2006
Posts: 202
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From: Hamburg PA
97 thermostat change
hi guys my dad just replaced the thermostat on his 97 4.6 when he removed the old thermostat he said he lost about hlaf a gallon of coolant after putting in the new one we cant seem the get the fluid level to go down in the resivior and the heat doesnt seem like its getting as warm as it used to either. any ideas on why this is happening?
New User
Joined: Dec 2007
Posts: 1
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From: Southeast Coast
Two things come to mind. Either the thermostat was install backwards or else there is an air pocket trapped in there. I would suspect the air pocket first though since this happens all too often when changing out tstats. Good luck and hope this helps.
Senior User
Joined: Sep 2006
Posts: 252
Likes: 0
From: North Pole, Alaska
Sounds like the system is air bound. Have you let the engine warm up until the thermostat opens? The resivoir is connected to the radiator so until the thermostat opens the system cannot completely purge all the air out. Sometimes it takes a while to burp all of the air out.
