bigdog101197

I have a 88 LX 5.0, and I am running hot now. Its fine when it sits but on a short drive it goes to 260. I have a new thermostat, water pump, and an electric fan. I checked to make sure the thermostat works and it does. Also have a new cap for the radiator, and a temp sensor. Any help would be great. Thanks Adam

dsm king

Are theyre any leaks? Check around for leaks around the water pump gasket area. Maybe your radiater isnt up holding up anymore, check that out too. You may need a new one. Thats all I can think of right now.

89stanglx

did you try leaving your radiator cap off while idiling for a while maybe it is air locked. When the t-stat opens you will probably get a lot of air then the water level will drop way down in the radiator.

bigdog101197

Can you tell me how to get the air out, I have left the cap off and let it run till it goes down. but then what do I do. Am I supposed to fill it back up or what??? Thanks Adam

89stanglx

yes keep the radiator full.

bigdog101197

So when it runs out the top just let it run out.

89stanglx

Just keep a garden hose ready to keep it full, it is probably air pushing the water out. Dont let your engine hit 260 it cant be good.

89stanglx

when i first got my mustang i replaced the t-stat and flushed the cooling system and this was my problem, air lock. the engine temperature shot up after a few min and blew water out the radiator cap relief. after removing the cap and letting it warm, air pushed some water out and i was able to refill it and problem solved . I hope this is your problem Good Luck!

Quik

if it went that hot once its not going ot be the same. good chance your head gasket could be torn mine was doing the same

C/Note

is it over heating or our is your gauge.....it might be i stopped up rad,,,,is this a new motor ,,did you just pit head gaskets in it ,,you might have but then them on wrong,,,one goes on one way the other is upside down..you know what i mean buy that ,,you did put the right water pump on it the reverse rotating pump....