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I have an 06 freestar. New water pump, new thermostat, new radiator. Temp guage redlines with acceleration. Goes back to normal when I let up on the gas pedal. Very frustrating. Any suggestions?

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Air lock cooling system


Not sure I follow your wording on the different temps. If the system is full of coolant and working correctly, the thermostat should open at 195 degrees which would be several miles down the road. Once the thermostat opens both radiator hoses should be warm. If the water pump is not working the engine will get hot very quickly.
Have you tried running without the thermostat to see what happens ?

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Hi have a 2004 freestar I changed radiator-, water pump , thermostat, engine coolant if I drive on flat street my van runs good temp is normal but if I go uphill the gauge goes up to almost red once I...


Sounds like a faulty temp guage/r a strange malfuntion in a sensor to me as well, only doing it when it going up hill really makes no sense for the way the cooling system works so I doubt that its actually running hot, which is likely why he asked about the gurgling noise, it would force water back into the resivoir if it was running hot assuming that the thermostatic radiator cap is working properly.

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Check that the water pump drive belt is tight
Check that the cylinder head is not blowing.
Check the impleor on the water pump is not eroded
Check theair flow through the radiator is ok.
Check electric cooling fans operates if fitted.
Are you driving in to low a gear?
Are the brakes draging?
Check to see if you have some contaninated fuel
Check that the correct ignition time is ocurring at all engine speeds.

Best of luck Cliff UK

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Check the operation of the cooling fans at the radiator. While idling disconnect the coolant temp sensor at the top left (drivers side) of the engine. It will be a 2 wire connector near the thermostat housing. When disconnected the coolant fans should come on immediately, if not you have an electrical issue with the relays or blown fuse. Check the fuses first in the underhood electrical panel. Next swap the cooling fan relay with an identical one next to it, if the fan works the relay is open.

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My 2000 Odyssey keeps redlining the temp guage, but it has a new radiator and thermostat, and the coolant is not boiling over. It only seems to happen after driving freeway speeds. Once it redlines, A/C...


You may need to change the water pump. When the engine is cold undo the rad cap, start the engine & see if there is any coolant moving through the rad. If not change the water pump & the pump serpentine belt. This should solve the problem unless the headgasket is in bad shape. Good luck!

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blown head cylinder gasket , check if there is oil in your coolant ,

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Are your cooling fans working? that will definately be a problem if not working. if they are working shut car off and feel the radiator is it the same temp all over or is it hot in only top or one smaller area. if you do not have same temp feeling on all of radiator your radiator may be plugged.

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