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Bad Thermostat??

   
Old 12-30-2009, 01:12 AM
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Lightbulb Bad Thermostat??
Ok guys I have a huge problem and I have no clue what to do. Got a 93 F150 XLT 5.0 4WD. When I start it to warm up in the morning my heat doesnt get warm. Then i drive and it gets warm then cold again. My temperature gage goes haywire from hot to cold over and over. After a while it stops and goes normal until i come to a stop light, and it goes right back up. Then i take off and it goes back down to cold. Does anyone know whats going on??
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Old 12-30-2009, 01:55 AM
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Is the motor overheating? It could be a lot from clogged cooling system( heater core, rad) , blown headgasket, or maybe just a funny cold/hot switch.
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Old 12-30-2009, 03:35 AM
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Sounds like you're low on antifreeze.
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Old 12-30-2009, 12:25 PM
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Originally Posted by Just call me Sean
Sounds like you're low on antifreeze.
+1

Or your water pump may be getting ready to give up the ghost...
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Old 12-30-2009, 12:28 PM
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Originally Posted by Just call me Sean
Sounds like you're low on antifreeze.
+2

Check your coolant level in the radiator. Remember to only open the cap when the radiator is cool.
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Old 12-30-2009, 12:51 PM
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That just might be it. But that would mean that something else is wrong because i just filled the reserve tank monday. Ill check it and let you guys know... Thanks for the info.
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Old 12-30-2009, 02:14 PM
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Sounds like you need to burp the cooling system.
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Old 12-31-2009, 03:34 AM
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Check the antifreeze in the radiator AND the reserve tank.
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Old 12-31-2009, 01:48 PM
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It could be a sticky thermostat...but I'm more willing to bet that its the low antifreeze.
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Old 12-31-2009, 02:36 PM
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sounds like it's low on coolant and a replacement t-stat woulndn't hurt
remember to burp(bleed) the system...
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