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post #1 of 9 (permalink) Old 04-12-14, 11:19 AM Thread Starter
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coolant temperature guage

I have recently changed the lower intake gasket to stop a coolant leek and changed the coolant .
Since doing this, I have noticed the temperature gauge works normally until I drive at highway speeds then it red lines. After slowing down a bit, it will go back to normal. engine doesn't seem to be overheating.
I have also replaced the thermostat .
now the coolant light has come on as well but fluid is up to fill line or a little above.
Has anyone had this problem?
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post #2 of 9 (permalink) Old 04-12-14, 11:24 AM
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Re: coolant temperature guage

Might help you get a reply if you supplied more info .What vehicle , engine , year , mileage etc . would help .
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post #3 of 9 (permalink) Old 04-12-14, 02:29 PM
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Re: coolant temperature guage

As R.S stated more details would help but I suspect a possible air pocket in the cooling system as a starting point. Does the heat blow hot air?


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post #4 of 9 (permalink) Old 04-14-14, 04:02 PM Thread Starter
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Re: coolant temperature gauge

the van is a 2006 ford Freestar 4.2 engine with 196000 kilometers .
I have run the van with the reservoir cap off for at least 15 minutes when I filled it and again when it was hot but still have the same problem.
The van doesn't seem to be overheating.
I had a problem years ago with a mystique having a water pump with plastic fins. Does anybody know if this van might have the same setup?
I did a Google search and found the same problem, but there was no solution. Somebody suggested that the water pump fins may be worn. This only happens at highway speed and operates normally in the city. Has anyone run into this?
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post #5 of 9 (permalink) Old 04-14-14, 04:19 PM
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Re: coolant temperature guage

If bleeding the coolant system as suggested doesn't work , partially blocked radiator ? or timing being out can cause running hot .
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post #6 of 9 (permalink) Old 04-14-14, 04:41 PM
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Re: coolant temperature guage

P.s
Dont know about the Freestar water pump , but there was the same fault with BMW , VW and Audi water pump impeller failures . causing similar problems a while back .
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post #7 of 9 (permalink) Old 04-14-14, 05:47 PM
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Re: coolant temperature guage

Not sure if they're prone to impeller wear, but the loss of flow could be contributed to cavitation do to the worn impeller. Due to age and mileage, your impeller could be worn.

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post #8 of 9 (permalink) Old 04-15-14, 05:29 PM Thread Starter
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Re: coolant temperature guage

There is heat coming from the heater

If it is redlining due to over heating would it cool down as quickly as just getting off the highway and shouldn't the engine be steaming or the rad hose be excessively hot or something else?
Also does anybody know if the fluid light and the temperature gauge get there information from the same censer?
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post #9 of 9 (permalink) Old 04-15-14, 07:25 PM
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Re: coolant temperature guage

Not 100% sure, but I'd assume that the PCM would toggle the light when it saw the sensor above a certain value. The rapid cooling also fits the scenario of the pump cavitating, once it slows down, the cavitation stops and you actually start moving fluids again. The only thing that doesn't fit the the normal for your situation is the heat, but, depending on how it's piped and what not, it doesn't necessarily negate the possibility of a worn pump.

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