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yep, at least it'll only cost you about $6 to find out if it's the thermostat.

Could it also bea bad heater core? I replaced my t-stat and was cooking from the heat 10 minutes later. doubt it is your stat.

Curious to hear how things are going. Are you still losing a lot of coolant? Any luck with that top radiator hose? Your oil ok? The white streak you see is probably dried coolant. Coolant turns white and crystaline when dried. Wipe it off and see if it comes back. Maybe clean off all...

Some good block seal may work if it's a small crack. Might be worth the $25 job before hauling her in.

How much coolant are you losing? Where is it going? Any in your oil (milky / bubbles?) or through your exhaust (white smoke, moisture, smog test can find as well...)? You sure it's not the intake manifold that needs tightening or a new gasket? (typical problem) Did you check the water...

Yep, I installed the thermo with the little valve thing at 12 o'clock. Seems like most who have the same problem did so as well... The air in my hose is, of course, on the radiator side of the thermostat - bleeding out through the thermo ok, but getting stuck at the cooling system's high...

Seems to me that changing the pump, etc. got a lot of air in the system which is taking its time to work out. I know you said you burped your rig already, but maybe checking that top radiator hose again would help... I just returned from a 1200 mile trip on my new pump and thermo. After...

steved, have you used a cleaner on your system? Checked your heater hoses? What does your gauge wander range between with the heater on?

Problem solved (I think). Here's what I did... luckily it was fairly simple: 1) Flushed the coolant 2) Burped my baby really good (running at idle, with the rad cap off, for about 20 minutes - pressing on the top of the upper radiator hose every once in a while, felt / found a lot of...

Installed a new water pump and thermostat on my '94 Explorer 4.0 today. Now, I am experiencing rapid fluctuation in temperature from the 'N' to 'R' in normal - from one minute to the next. This is city driving, haven't had her on the highway yet. With my old setup (original water pump and...