Please Help Diagnose my Cooling problem

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Jun 28, 2010 | 05:38 PM

shadowznyc

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Joined: Jun 2010

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Please Help Diagnose my Cooling problem

Hello, i have a 1999 Ford E150 4.2 V.6. When driving the van after fifteen minutes or so the dash temperature guage shoots from middle to high. The van i not overheating but the dash temp light comes on and the temp guage jumps to hot acting as if there was a dead short somewhere. Where does the temperature guage gets its signal from? Thermostat housing? Whats the correct technical term for that guage switch? Does anyone have a schematic of the motor layout i can take a look at?

Please help

thanks

Jun 29, 2010 | 12:36 PM

wizzy214

Tuned

Joined: May 2010

Posts: 309

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From: Wilsonville,Oregon

sounds like your thermostat is stuck open or closed, their cheap just replace it.

Jul 1, 2010 | 06:25 AM

first_stater

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Joined: Jun 2010

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I've got a similar problem. Also my lighting flickers constantly. I'm wondering if I have regulator/gen problems that is causing reference voltage problems to the sensors and PCM? I'll post what I find.

Jul 3, 2010 | 02:49 PM

Grems4ever

Lead Driver

Joined: Aug 2009

Posts: 7,577

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From: Laquey, MO

I'd replace the thermostat just to be safe and then find someone with an advanced scan gauge to check the reference temp from the temp sensor. You could have a bad sensor as well.

Let us know about the charging system check. That used to happen frequently with bad alternators in older vehicles, but I haven't encountered it in a newer one.

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