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Head temp sender
Posted by: stings ()
Date: July 18, 2013 08:15AM

What does the head temp sender for the idiot light look like and what side head does it go on?

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Re: Head temp sender
Posted by: cnicol ()
Date: July 18, 2013 08:19AM

Right rear, inside lower duct, below cylinder #1

Click for picture

I surmise that you don't have access to a manual...

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Head temp sender
Posted by: 66vairman ()
Date: July 18, 2013 08:38AM

O.K. a little terminology issue here.

The idiot light uses a temperature sensitive snap switch. On LM cars there are two different sizes depending on the heads. The 140 heads use a switch with the same threads as the temperature gauge "sender". The sender is on one head, the snap switch is on the other head.

The 110, 95 heads use a snap switch with a different thread size.

I believe the EM and LM turbo heads use the same size as the 140, but frankly I’ve forgotten.

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Re: Head temp sender
Posted by: stings ()
Date: July 18, 2013 12:34PM

I put the thermister on the passenger head on my 140, the other switch goes on the drivers side? Napa sold me a big switch, it looks to big?

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Re: Head temp sender
Posted by: cnicol ()
Date: July 18, 2013 01:46PM

What's the part number of the thing NAPA sold you? I'm certain it's wrong but curious as to what they sold you.

Yes, the snap switch for the idiot light goes under cylinder #1 as stated. Note that 140/150/180 uses a different switch (fine thread, higher temperature switching) as compared to regular Corvair models. (coarse thread, lower temperature)

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Head temp sender
Posted by: larry202br ()
Date: July 18, 2013 01:53PM

If they sold you a thermistor, you've hit a gold mine! ggg. compare to the pic Craig posted.

1961 rampside with a 65 / 67 110 engine, car four speed.
1965 convertible
1966 Custom two door/four door

KC0SKX
Olathe, ks
HACOA

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Re: Head temp sender
Posted by: stings ()
Date: July 18, 2013 01:57PM

They sold me part#TS6469. I thought you needed the thermister and the switch. I have the thermister, so I guess i don't need the switch.

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Re: Head temp sender
Posted by: 66vairman ()
Date: July 19, 2013 09:19AM

stings - The idiot light is for when you are not watching the temperature gauge, or in a Monza it's the only overtemp indicator.

One oddity of the Corvair, after 1960, is the dual thermostatic controls - one for each head. Typically when they fail the door(s) go open, but the fact is the gauge only shows the temperature of one head, the snap switch only monitors one head on the other side.

Some folks use dual gauges, thermocouple types, with the sensors that go between the spark plug and the head. Still it's nice to have the idiot light switch if your not paying attention.

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Re: Head temp sender
Posted by: RobertC ()
Date: July 19, 2013 02:03PM

For reference:

Left to right:

140/180 - Thermister

140/180 - idiot light sw

95/110 - idiot light sw

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Re: Head temp sender
Posted by: steve c goodman ()
Date: July 19, 2013 02:15PM

stings Wrote:
-------------------------------------------------------
> They sold me part#TS6469. I thought you needed the
> thermister and the switch. I have the thermister,
> so I guess i don't need the switch.

Steve sez: you really do need the snap switch because that will make your warning light work if hot. You will see red lights before you notice gauge readings.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Head temp sender
Posted by: cnicol ()
Date: July 19, 2013 03:33PM

TS 6469 is for a regular, water cooled Chevy engine. Entirely wrong for a Corvair.

Yes, you should have both a thermister and the head temp switch. One monitors the left head with a gauge and the other monitors the right head with a light. As Steve said, a person is much more likely to notice a red light than an abnormal gauge reading. Also, having both, monitors both heads rather than just one.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Head temp sender
Posted by: jjohnsonjo ()
Date: July 19, 2013 03:34PM

Not to mention the BUZZER.

J.Ol

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Re: Head temp sender
Posted by: Ron62 ()
Date: January 12, 2019 02:58PM

How do you test the snap switch on a 67 ?

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Re: Head temp sender
Posted by: MattNall ()
Date: January 12, 2019 03:49PM

Put it in an oven... heat to 425f and test with DVM.

Keep raising / lowering temp 25F until it closes opens..

OLD switches close at lower and lower temps until they finally stay on.

110> 525F

140/150/180 < 575F





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