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Ford uses lots of switches instead of senders. Can't speak intelligently

About your thermometer but that could easily be one too. I know their oil pressure units are switches. As long as you're at 15 psi (exceedingly low IMO) your oil pressure will read in the normal range.

I still vote for air. Are you actively bleeding the system? Any time I have had spikes that resolve themselves quickly it's been an air bubble.

Perhaps you have a grounding issue if your temperature sender is just a switch.

I always try to eliminate the stupid things (like ground issues) first.

(In response to this post by 48zip)

Posted: 04/13/2016 at 09:51AM

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Current Thread:

I am stumped by this engine problem. All ideas appreciated. -- 48zip 04/13/2016 08:09AM

Which engine? I can get a system diagram. It looks as if you have -- 81_Hokie 04/13/2016 12:11PM

Correct engine, and you have found our issue which is why I replaced both -- 48zip 04/13/2016 1:30PM

Have you bled the system recently? Its a stretch.......... ** -- vt_mughal 04/13/2016 11:47AM

Yes, but I'm doing it again this afternoon. Nothing to lose! ** -- 48zip 04/13/2016 1:31PM

Here's a thought to consider. Maybe it's electrical.... -- 48zip 04/13/2016 09:49AM

Definitely a possibility if temp "sender" is a switch. Gotta have good PE -- typed by ben 04/13/2016 10:31AM

I'd say it is (link) -- 48zip 04/13/2016 10:35AM

Are you having to replace coolant on a regular basis? -- turkeywinghokie 04/13/2016 09:17AM

Nope. (and just had radiator and heater core replaced) All fluids are fine ** -- 48zip 04/13/2016 09:35AM

Heater exchange. ** -- GFallsFan 04/13/2016 09:11AM

By the way, thanks to all for input. I'm not trying to argue against any -- 48zip 04/13/2016 08:43AM

You have lots of air in your system, The spikes are steam hitting sensor ** -- typed by ben 04/13/2016 08:37AM

I'm pretty sure air is out, and too early for steam (I think). also... -- 48zip 04/13/2016 08:40AM

Ford uses lots of switches instead of senders. Can't speak intelligently -- typed by ben 04/13/2016 09:51AM

Yeah, even their oil pressure gauge is fake, It's normal or high or low. -- 48zip 04/13/2016 10:07AM

Thank you for saying that. We miss him very much. Good luck with your truck ** -- typed by ben 04/13/2016 10:23AM

Johnson rod ** -- OXVT 04/13/2016 08:37AM

Agree on new thermostat. -- GoTechGo 04/13/2016 08:27AM

My mechanic uses a high-end one. No apparent temp issues. and.... -- 48zip 04/13/2016 08:37AM

Head gasket? ** -- capitals1 04/13/2016 08:26AM

Water and oil levels seem fine, no white smoke, and PLEASE NO! ** -- 48zip 04/13/2016 08:45AM

Need a new thermostat? ** -- SavannaHokie 04/13/2016 08:14AM

That seems to work fine. -- 48zip 04/13/2016 08:35AM

^thermostat is usually the first thing you change..cheap and easy -- HokieDan95 04/13/2016 08:21AM