Have an electric choke...do I need this coolant hose?

[Robert Kyle]

I want to replace my temperature switch housing (on the right, hooked up) with one from a 320i (left) that has two fittings holes for switches (I want to run a separate temp gauge along with the OEM one).  The 2002 housing has a coolant hose going to the intake manifold.

 

Do i need this coolant hose?  The 320i doesn't have one.

 

I figure the heater hose and the water pump hose going to the intake would be enough?  No? 

[Robert Kyle]

#6 here.

 

 

[Robert Kyle]

Or can I use my this port in the intake manifold (does it get water there?) where my defunction/de-smogged dual-space temp sensor switch was???

 

 

[jimk]

5 minutes ago, Robert Kyle said:

(does it get water there?)

Feel underneath and you will answer your question.

[Robert Kyle]

nothing.  No water under there that I can feel.

[Mark92131]

3 minutes ago, Robert Kyle said:

nothing.  No water under there that I can feel.

 

Your question is answered, that is used by emission system (T1 Switch).  There is a T2 Switch used by the emission system under the manifold in the water jacket.  If your emission system is not hooked up, it may be a candidate for replacing the T2 switch with a temp gauge sender.

 

 

Mark92131

 

 

['76mintgrün'02]

Off topic, but it looks like are missing the insulating bushings under the nuts that attach your fuel pump.

 

#3 in this diagram

 

 

 

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No.	Description	Supp.	Qty	From	Up To	Part Number	Price		Notes
01	Push rod		1			13311255727	$5.85
02	Insulator	AF	1			11111721614	$6.77
03	Insulating bushing		2			13310075752	$1.57

 

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[John76]

The T1 Switch is the ambient air sensor. The mounting is a threaded hole in the manifold webbing. No plug is needed (no water).

The T2 Switch is the coolant sensor underneath the manifold. This sticks up into the hot coolant used to heat the intake charge.

Not sure if this would  be an ideal location for accurate coolant temps. The flow through the intake manifold is fairly restricted.

Either leave the switch in place, or toss it into the neighbor's pool and use a threaded plug and crush washer to seal the opening.

[Mike Self]

17 hours ago, Robert Kyle said:

I figure the heater hose and the water pump hose going to the intake would be enough?  No? 

 

Correct me if I'm wrong, but the bowl-shaped depression directly below the temp sender switch on your original 2002 fitting looks suspiciously like an un-drilled/tapped boss for some other sender.  It's similar to the undrilled boss on non-tii oil filter housings; on a tii it's drilled/tapped for the oil line that runs to the K-fish pump. 

 

If you take the water distribution fitting off the car (or examine a spare that's already removed) I'll bet you'll find that you could drill/tap this hole to take another sender.  I did exactly that on my oil filter housing to accommodate an oil temperature gauge fitting and it works like a charm.

 

mike

['76mintgrün'02]

I think that diverter is a '76 only part. 

 

Just make sure to drill and tap nice and square to the face of that boss, because the sender seals with a washer.  (Not so critical with tapered fittings).