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Old 01-14-2010, 05:26 PM
mfgfan37 mfgfan37 is offline
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Question Overheating Problem

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, 05:54 PM
FireRanger FireRanger is offline
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Yes, replace the radiator cap as well. And are you sure you put the thermostat in the right way?
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Old 01-14-2010, 09:00 PM
mfgfan37 mfgfan37 is offline
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Yes the radiator cap has been replaced and the thermostate is in corretly. Any other thoughts?
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Old 01-16-2010, 01:56 PM
Arick Arick is offline
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I was having the same problem with my '89. You could try checking the water pump first, then maybe the heater core
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Old 01-17-2010, 03:29 PM
FireRanger FireRanger is offline
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The heater core is not going to cause over the engine to overheat no matter whats wrong with it.

Engine cooling requires:

- Flowing coolant: If the water pump is failing, the water isn't going to flow through the radiator. If the thermostat isn't opening, the water isn't going to flow through the radiator. If the radiator is plugged up, the water isn't going to flow through the radiator. Given that you've already done the t-stat, I would double check radiator flow. You should also be able to access the inside of the water pump with the t-state removed and see if it looks internally damaged.

- Air over the radiator. The fan handles this when you're stopped and any forward motion 10mph or more will provide enough air to cool it as well. Unlikely this is the problem unless you have a sheet of plastic shoved in your grill.
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2003 Edge 4.0 4wd

How to: Aux light wiring, relays, & fuses
Info: 300+ intake threads here on FRF
Info: HID Projectors
How To: NO HEAT Troubleshooting Guide
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