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  #1  
Old 01-14-2010, 12:31 PM
mfgfan37 mfgfan37 is offline
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Default Overheating & Heater Issues

We have a 2000 ford ranger that overheats then gets cold. the heater does not work until the truck overheats then starts working until it cools off then it overheats again and the heater works again? The gage fluctates from cold to hot the entire time you are driving it. We have replaced the thermostate and flushed the radiator. Are there any other suggestions as to what is wrong and how to fix this problem?
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Old 01-14-2010, 02:09 PM
Kingoverace Kingoverace is offline
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well, you might notice, its only cools when you are moving??? then starts to overheat at red light and stops?
Firstly, if the truck has been running since you flushed it, then double check your rad fluid in case there was air pockets. If your rad is absolutley full, expansion tank less then half full, then make sure your radiator fan is coming on, otherwise the fan clutch is shot.
My next guess is your water pump. The pump sapposed to move the coolant throughout the engine block, and too the heater core(heat).
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Old 01-30-2010, 05:32 AM
bengiff3 bengiff3 is offline
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Hello,

I seem to be having a simular problem. It takes until the heater gauge needle gets up near the h before i get any heat through the heaters, normally 10-15 minutes. Sometimes the needle on the gauge fluctuates up and down wildly! Also when i stopped and turned the engine off i could hear water gurgling from under the bonnet (behind the dash) but no fluid leaks! Wondered if you havehad any joy with fixing your problem yet.
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Old 02-01-2010, 08:10 AM
mfgfan37 mfgfan37 is offline
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Have not found the cure yet..... if you do let me know. that is exactly what is happening to ours the gurgling sound and everthing???? We have had very cold weather here and it's been hard to be outside to work on anything. let me know if you find the cure. thx.
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Old 02-01-2010, 10:12 AM
FireRanger FireRanger is offline
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You guys are going to wreck your engines doing that. First of all, the needle should never go beyond the 1/2 way point on the gauge. The halfway point on the gauge is about 190 and that is where your truck should operate.

The cooling system is a closed loop that should be void of air. If you hear gurgling, you are low on coolant whether you think it or not. On a cold engine, open the radiator cap and look inside; it should be full. The reserve tank should be 1/2 way filled up. If either are not, you need to start adding more.

The reason you are not getting heat is the lack of coolant. The reason your temp gauge is reading so high is the lack of coolant. And pretty soon, the reason you will need to replace your engine is the lack of coolant.
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