1999 FORD Expedition, 5.4L PCV coolant heater

[mdpepper]

1999 FORD Expedition, 5.4L PCV coolant heater.
 PCV heater is bypassed. no coolant to the PCV heater, I failed it under Tamper, anybody came across something similar ?

[none]

I see Hondas with the PCV heater on the breather side bypassed every so often and fail them too.

[Kevin]

The purpose of the PCV heater is to prevent the PCV valve from freezing in cold ambient temperatures. Heated PCV valves are heated either by water or electric. Water heated systems use engine coolant to heat the valve to prevent freezing, so why fail it if the pcv is functioning 

On Tue, Mar 23, 2021, 12:47 PM mdpepper [via Stop The Star Program] <[hidden email]> wrote:

1999 FORD Expedition, 5.4L PCV coolant heater.
 PCV heater is bypassed. no coolant to the PCV heater, I failed it under Tamper, anybody came across something similar ?

---

If you reply to this email, your message will be added to the discussion below:

http://stop-the-star-program.3084.x6.nabble.com/1999-FORD-Expedition-5-4L-PCV-coolant-heater-tp5083396.html

To unsubscribe from Stop The Star Program, click here.
NAML

[none]

Kevin wrote

The *purpose* of the *PCV heater* is to prevent the *PCV* valve from
freezing in cold ambient temperatures. *Heated PCV* valves are *heated* either
by water or electric. Water *heated* systems use engine coolant to *heat* the
valve to prevent freezing, so why fail it if the pcv is functioning

Because it won't function as designed in cold weather.

[none]

KEVIN, Do you not fail them if the thermostatic air cleaner assembly is missing on a carbureted Chevy truck?

[none]

Anytime pressure drops across a restriction the temperature drops. This is how A/c work through the orifice valve or why carburetors freeze up the venturi. A vacuum across a PCV valve or orifice does the same thing and can freeze up without having freezing ambient temps.  

[Technician A]

none wrote

I see Hondas with the PCV heater on the breather side bypassed every so often and fail them too.

Is the heater the coolant hose that is side by side with the pcv breather hose?

[mdpepper]

yes im also catching many aftermarket cold air intakes with the missing cooler pipe, Im failing them too