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Test for overheat light sender
Posted by: Colorsarge ()
Date: May 18, 2020 08:15AM

Driving my Corsa yesterday for about 15 miles. Just as I was about to park, o.p./temp light came on. Shut engine down. I could put my hand on tin work. No sign of overheat. Started engine and unplugged o.p. Sender. Light still on. Light was on and off on trip home. Sometimes down shifting turned it on/off. Thinking wiring short, but, how do I check sender?

Frankford, De., eight miles north of Ocean City, Md.
1966 Corsa convt.

Re: Test for overheat light sender
Posted by: jjohnsonjo ()
Date: May 18, 2020 08:22AM

Oil pressure is the top sender, temp is under the lower shroud . Just making sure you got the correct one before you go any further. Its hard to pull the lower one with a hot engine.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa


Re: Test for overheat light sender
Posted by: MattNall ()
Date: May 18, 2020 08:32AM

Test in a toaster oven.

Heat to 300 for 10 minutes Take out and use ohmmeter to see if it's closed.

then go to 350, then 400, 450 Switch shouldn't close. New ones are set for 525F

MODERATOR
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Re: Test for overheat light sender
Posted by: Colorsarge ()
Date: May 18, 2020 09:46AM

Thanks, I'll test it that way. I know which switch is the correct one. Still thinking wire shorting because of on and off, but, want to confirm switch is good.

Re: Test for overheat light sender
Posted by: steve c goodman ()
Date: May 18, 2020 09:51AM

It is fairly common to see wires near the idler pulley or crank pulley get frayed and cause the intermittent contact which is ground and makes the light flicker. The upshift/downshift can make the wires move around a bit. Look at your wiring from the two switches closely before taking bottom shroud off.

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/V8 Registry

Re: Test for overheat light sender
Posted by: Colorsarge ()
Date: May 18, 2020 04:11PM

Switch tests good. Initial check of wires from o p switch and temp switch to plug near distributer look good. I suppose short could be further on in harness or even behind dash. Nothing is an easy fix with this car and I've had a lot of Corvair experience although not in a long time. Did not test O P because lifters never got noisy and would not have lived to make drive home if O P problem.

Frankford, De., eight miles north of Ocean City, Md.
1966 Corsa convt.

Re: Test for overheat light sender
Posted by: Lane66m ()
Date: May 18, 2020 04:37PM

But an oil pressure switch can fail also and give you a light and NOT be the result of low oil pressure.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


Re: Test for overheat light sender
Posted by: Colorsarge ()
Date: May 18, 2020 05:37PM

While light was on I pulled wire off oil pressure switch. Light stayed on.

Frankford, De., eight miles north of Ocean City, Md.
1966 Corsa convt.

Re: Test for overheat light sender
Posted by: Lane66m ()
Date: May 18, 2020 05:46PM

Did you jiggle the wire going back to the connection where both switches (2 connections)joins with the engine harness to see if light flickers or go out.

Might want to consider disconnecting both switches from the engine harness and checking the wiring for both switches with an ohm meter. One of the wires is probably grounding.

Al Lane
Ellabell, GA 31308

1966 Monza Coupe, 110 hp, 4 Spd
1966 Monza More Door 110 hp, PG
1968 Camaro SS Coupe 350 CI 295+ hp PG
1964 Greenbrier Deluxe, 6 dr, 80 hp car engine, PG
1947 Farmall A tractor 15 hp


Re: Test for overheat light sender
Posted by: Timothy Shortle ()
Date: May 18, 2020 07:41PM

"jiggle"?
I am curious, what is your cylinder head temp. gauge reading when light is coming on? I also believe it is a wire grounding issue.

Re: Test for overheat light sender
Posted by: Frank DuVal ()
Date: May 18, 2020 07:50PM

Yes, Jiggle:

jig·gle
/?ji??l/

verb
move about lightly and quickly from side to side or up and down.

Frank DuVal

Fredericksburg, VA

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