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Unread 12-18-2014, 04:38 PM   #1
Marauder_Pilot
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Ford 5.4L-won't warm up

So, I bought a Ford E350 5.4L with a 4WD conversion to build an overland camper with. It's been sitting for 3-4 years, so first order of business was draining all the gas, oil and coolant and replacing them with fresh fluids.

Afterwards, it runs, idles and drives just fine, but the engine doesn't seem to heat up at all. The temperature gauge is always pegged just a hair off the bottom, and there's barely any heat coming out of the heater. There's a CEL, but it's noting a bad injector, nothing related to the cooling system.

I've never run into anything like this before, anyone know where I should start?

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Unread 12-18-2014, 05:20 PM   #2
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Stuck thermostat.
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Unread 12-18-2014, 10:36 PM   #3
Cause
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Is there even a T-stat in it?
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Unread 12-18-2014, 11:00 PM   #4
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My first taco did the exact same thing, went to check the tstat and found it to have been removed. Put a stat in and immediate overheat, cracked head that was pumping exhaust into the coolant system, hidden by the missing thermostat. 1st place to look.
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Unread 12-19-2014, 05:08 AM   #5
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Quote:
Originally Posted by Indy View Post
Stuck thermostat.
This.

Even when you fix it, keep in mind that Ford's are notoriously slow to heat. My dad used to let his '64 Mercury warm up in the driveway for 15 minutes, before going anywhere in the winter... in NC!

I've owned;

- '68 Mercury Monterey
- '79 Ford Bronco
- '89 Country Squire Wagon
- '93 Mustang GT (purchased NEW!)
- '95 Mercury Gran Marquis

Different eras, different engines, and they were ALL slow to heat up! My '92 Ramcharger has a stuck blend door (a/c blows great, heat DOESN'T) and it still gets warmer, faster, than those 5 above COMBINED!!!

So when you fix it, and it's STILL slow to heat, than it's working JUST fine.
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Unread 12-19-2014, 09:49 AM   #6
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Don't worry, I know how long an E-Series takes to warm up-I drive them every day for work too (Electrician). But after driving 20 minutes down the highway and it hasn't moved, that's a pretty good sign it's a problem.

I'll pull the thermostat today and see what's happening there.
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Unread 12-19-2014, 11:20 AM   #7
Indy
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By the time I hit pavement in my tacoma I have a warm engine and good heat. My mustang, I'm 1/2 way to work and the needle hasn't budged yet
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Unread Yesterday, 03:57 PM   #8
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Thermostat needs replacing.
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Unread Yesterday, 07:29 PM   #9
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Quote:
Originally Posted by Marauder_Pilot View Post
Don't worry, I know how long an E-Series takes to warm up-I drive them every day for work too (Electrician). But after driving 20 minutes down the highway and it hasn't moved, that's a pretty good sign it's a problem.

I'll pull the thermostat today and see what's happening there.
Do you know how to test it when you have it out?

If you put in a new one... ALWAYS test it before installing it!

Hint--- pan of water on the stove and a thermometer---
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