oil temp vs coolant temp - Ford Powerstroke Diesel Forum
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Old 10-23-2013, 05:38 PM
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oil temp vs coolant temp

So I have been having some questions on my oil temp. Oil temp will be around 190-195 but the coolant struggles to get to 170-180 degrees. I was thinking it was a thermostat issue, stuck open? Heat works great in the truck so I'm a little confused.
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Old 10-23-2013, 06:33 PM
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How and where are you measuring coolant temp?
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Old 10-23-2013, 07:29 PM
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Have a gauge and I'm taking the reading from the line feeding the heater core coming off the water pump. Oil temps sending unit is on a rear port of the oil cooler.

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Old 10-23-2013, 09:20 PM
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The line between the heater core and the water pump is the OUTLET of the heater. The INLET is the one from the side of the block. The heater core is always plumbed; no control valve. So that coolant is downstream of the heater core. That may explain the low reading.
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Old 10-24-2013, 05:29 AM
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I had it in the other line and when I turned the heat on I could see the temp gauge dropping. Is there anywhere else I can go? Tired at the water pump but could not get the plug out.

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Old 10-31-2013, 05:51 PM
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so I do have it in the correct line. is there a better place for it?
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Old 10-31-2013, 06:34 PM
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I'd go with where one of the existing sender is. There's one for the lame gauge on the dash, and one for the lamer light on the dash. You could just decide which one you could do without, and use that hole for your sender.
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Old 10-31-2013, 06:50 PM
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If you have a smart phone you can get a Bluetooth OBD 2 port reader for less than $20 and spend another $10 on a digital gauge app... Turns your phone into a digital monitor and can view tons of sensors thought the entire engine and trans. I would suspect your thermostat just needs changed and is a good chance to get rid of the ford gold coolant and replace it with a quality ELC coolant. I recommend Cat EC-1 coolant.
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Old 10-31-2013, 06:51 PM
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I had thought about one of those. Any one in particular you recommend?

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Old 10-31-2013, 06:55 PM
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Which smart phone do you have? Android, iPhone, iPad, iPod, blackberry....
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