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post #1 of (permalink) Old 02-22-2005, 01:12 PM Thread Starter
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Thermal switch part no.?


I am trying to find this 'thermal switch' in any auto parts store. It's for the intake manifold heater system and I am missing this part. I am in the process of converting my 84 258 cj7 to a Howell TBI and this is just one part of the required original "emissions" system that needs to stay in California.

Thanks


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post #2 of (permalink) Old 02-22-2005, 01:33 PM
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Re: Thermal switch part no.?

I've got a spare intake for a CJ....I believe the switch is actually the computer. The relay for the heater is on the fire wall. There is a thermostatic switch on the intake that tells the computer when the air is warm enough and the computer will then turn off the heater via the relay.

I'm going off memory on this so I might be slightly wrong. There is a link to a tech article that covers this and all other related systems on the CJ....I know someone here has it. I belive you will find it if you browse Off-Road tech articles.
post #3 of (permalink) Old 02-22-2005, 05:50 PM Thread Starter
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Re: Thermal switch part no.?

Thanks,

I got that web site you are talking about. I linked it in my first post. It called a manifold heater switch, the other one I think your are talking about is the coolant temperature switch that is connected to the old ECU. The switch I am looking for is a one wire that is closed below 160 F and open above 160 F.

I am just not sure how to know if I am getting the right part.
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post #4 of (permalink) Old 02-23-2005, 04:59 AM
 
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Re: Thermal switch part no.?

From my factory PARTS manual there were 5 different switches used on the I6 intake manifold:

1981 US-49 State---------J323 9065
1981 US-California-------J323 9126
1982 --------------------J322 2254
1982 EXPORT--------------J323 9065
1983-1986: one terminal--J324 2321 (Manifold heater ?)
1983-1986: two terminal--J324 2318 (Computer?)

Itallics are mine
Note: My part manual illistration lists BOTH switches on the intake manifold as part reference #5 so I'm sure you need the 1983-1986: one terminal--J324 2321. Dumb way to list them.

Hmmm.. There is actually a factory part number for a plug for the EGR tube opening in the exhaust manifold and a export manifold!


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post #5 of (permalink) Old 02-23-2005, 11:14 AM Thread Starter
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Re: Thermal switch part no.?

Thanks you so much John, I think you are right about which temp sender it is, the one wire.

That is also interesting about the EGR plug listing info. Good to know.

I tried to remove the old 'two terminal' sensor, but it broke off at the head. (Of course!) 20 years of time and parts do not like to come out. Know I have to figure out how to remove the rest inside the aluminum manifold without having to take the manifold off! AUGGGG!

Thanks again!
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