1975.5 – Early 1976 Cadillac Eldorado Seville EFI COOLANT TEMP SENSOR Replaces 1606011

1975 1976 Cadillac EFI Air - Coolant Temperature Sensor replaces GM 1606011. I have seen other eBay listings where these are referred to as MAP sensors. These are for EARLY Cadillac EFI only (*See note below regarding 1975 and early 1976 Cadillacs using originally using PN 1606011 with flat blade connection). I do as well sell a replacement for the more common GM PN 1609968 also known as AC Delco PN 213-188 and Bendix PN 1181447.

This is a replacement for GM PN 1606011 but it is not NOS. It is a replacement with OE terminals and a professionally 3D printed replacement electrical connector housing which duplicates the geometry of the OE PAK-CON connector. Two sensors are used per car; one for the coolant and one for the intake air. Both are threaded into or near the intake manifold. This offer is for one replacement sensor with OE geometry connector. I listed the proper applications as I knew but PLEASE see the note at the bottom of the description as there was a VIN cut-off listed in the GM Cadillac reference information.

If the coolant temperature sensor goes bad you will have issues with cold starting. I researched the sensors and I replaced the original sensing device with a modern alternative with the intent of improving the durability. Electronically the resistance curves follow extremely closely in the most critical temperature range. The wire is GXL multi-strand all Copper wiring (not Copper clad Aluminum). The sensor housing is machined from brass hex-stock. Efforts have been made to allow the internal sensing element to maintain thermal freedom.

The NOS part in the photo is shown for reference and is NOT included in the offer (Not being sold as part of this offer). You will receive ONE new replacement part sensor assembly as shown which includes the following:

-Sensor "plug-and-play" direct replacement (1 pc which includes the assembled housing, wire, OE style, but 3D printed, plug and OE terminals assembled)

This sensor varies in resistance based on temperature. There is no + / - but the replacement connector is labelled with “A” and “B” similar to the OE connector. You can also test your sensor prior to even removing it. There are some rare cases where the sensor is good but the terminals on the ECU have some corrosion preventing the ECU from getting a signal. I encourage you to test your sensors before you buy a replacement.

My understanding is GM moved to the round connector because they were better at preventing moisture from getting inside the connection (under hood moisture had the potential for corroding the terminals). I do sell the round connector and as well a wiring harness mating connector for the newer style but this original PAK-CON style is being offered for those who wish to maintain their original wiring harness without modification.

If you have a 1975 or early ’76 with the flat blade style connector PN 1606011 and you would like to move your original connector to this replacement it is possible to unpin the connector and change it. If you would like to know more detail regarding the unpin position please ask.

According to the GM parts manual the applications using the older 1975-76 version versus general 1976 and newer PN are defined below. There was also an “Adapter” GM PN 1605641. I suspect that allowed the newer 1609968 work directly on the older ’75-early ’76 cars without changing the wiring harness side connector.

1606011: Used on 76 K on cars before VIN 480001

1609968: Used on 76 K on cars after VIN 480000

1609968: Used on 76-77 C,E (Also see note** below)

1609968: Used on 77 K W/EFI

1609968: Used on 78-79 ALL series W/EFI

1609968: Used on ALL series W/EFI (350-8)

**PN 1606011 was possibly used on early 76 “C” and “E” cars. Take a look at the connector on your particular vehicle. The sensor and brass sensing end is the same thread for both versions. Only the electrical connector is different. This PAK-CON style I understand was also used for some early Eldorados which may have been referred to as 1975.5 or 1976 but the information I found does not list a VIN breakpoint.

Most of the key components are made in the USA including the brass housing, the electrical connector and the wire. The assemblies are built and designed in the USA.

Eldorado Biarritz Seville Sedan DeVille Coupe Brougham 75 76 See Note* for 75 early 1976 PACK-CON Packard.

ONLY for EARLY 1976 with flat blade connector originally equipped with PN 1606011