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Unread 09-23-2011, 09:42 AM   #1
swatson454
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Electric Plenum Heater

Once again, the search function isn't my friend. Can one of you guys tell me what water temperature the electric heater on the floor of the manifold is supposed to cut off at? California emissions-equipped '83 CJ7, 4.2L

Thanks!


Shawn

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Unread 09-23-2011, 09:59 AM   #2
86cj74.2L
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Around 160 I believe.
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Unread 09-23-2011, 10:12 AM   #3
mcmud
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Originally Posted by 86cj74.2L View Post
Around 160 I believe.
Thats the number.
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Unread 09-23-2011, 10:34 AM   #4
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Thanks guys


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Unread 09-23-2011, 09:07 PM   #5
86cj74.2L
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relay is on the firewall hanging out of the harness nere the mastercylinder.

If heater isn't working look at the relay first, You can follow the big gauge wire to the heater element to conform you have the correct relay.....orange or red with white stripe....I forget.
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Unread 09-24-2011, 08:01 PM   #6
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Originally Posted by 86cj74.2L View Post
relay is on the firewall hanging out of the harness nere the mastercylinder.

If heater isn't working look at the relay first, You can follow the big gauge wire to the heater element to conform you have the correct relay.....orange or red with white stripe....I forget.
Nope, it isn't. I'm pretty sure it used to but it ain't now. I removed the water heat from the manifold and ran it for a week or so before I remembered to disconnect the plenum heater so I may have killed it, assuming that will kill it.

The relay looks like it puked something caustic out of it so I'm guessing it's dead.

Thanks for the help.


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Unread 09-24-2011, 09:21 PM   #7
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Yea, mine looked bad as well. That relay is sort of special. Try and cross the part number on the relay. Do not just grab one off the shelf.

The relay is energized by the temp sensor. And the sensor is not a on off switch. So as it's resistance changes the output voltage goes up to a point the relay will "pull in" the make and break voltages are a little lower/different then your off the shelf automotive relay.
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