Where is the coolant temperature sensor on the 7.3L diesel engine?

Per Figure 2, the coolant temperature sensor is located on the left-hand (LH) side of the 7.3L diesel engine, shown low on the block near the overheat warning switch.

Where are connectors C187 and C188 located?

Figure 3 shows connectors C187 and C188 on the right-hand (RH) side of the 7.3L diesel engine, in the wiring harness near the alternator area, with an arrow indicating the front of the engine for orientation.

What system does this manual page cover?

The page is titled 'START/GLOW PLUG CONTROL/RUN (DIESEL)' and provides component location diagrams for the diesel start and glow plug control circuits on the 7.3L diesel engine.

Home/ Registry/ Ford/ F-150/ 1987-1991/ “Truck”/ Photo supermotors.net/registry/media/608362

Ford 7.3L Diesel Start/Glow Plug Sensor & Connector Locations - EVTM Page 34

Service manual page showing LH and RH side component locations on a 7.3L diesel engine

‹ ›

Service manual page identifying glow plug control and diesel engine component locations on the left and right sides.

AI caption February 2008 · Photo 8 of 9

This is page 34 from a Ford Electrical & Vacuum Troubleshooting Manual (EVTM) section titled "START/GLOW PLUG CONTROL/RUN (DIESEL)," covering the 7.3L diesel engine. The page contains two component-location illustrations. Figure 2 shows the left-hand (LH) side of the 7.3L diesel engine with blue callout arrows identifying the Tach Speed Sensor (optional), Fuel Line Heater Connector, Overheat Warning Switch, and Coolant Temperature Sensor. Figure 3 shows the right-hand (RH) side of the 7.3L diesel engine, identifying connectors C187 and C188, with an arrow indicating the front of the engine. The page helps a technician physically locate the sensors, switches, and harness connectors involved in the diesel start and glow plug control/run circuits before performing electrical diagnosis. Faint bleed-through text from an adjacent page is visible behind the illustrations but is largely unreadable; fragments mention engine idle behavior when cold, an Engine Temperature Switch operating around 312°F, and starter/ignition switch circuit descriptions. This page is part of an album of EVTM scans (pages 30–34) covering Start & Glow Plug circuits for a 1988 Ford diesel truck.

Is this accurate? Sign in to help verify it.

Frequently asked questions

Where is the coolant temperature sensor on the 7.3L diesel engine?: Per Figure 2, the coolant temperature sensor is located on the left-hand (LH) side of the 7.3L diesel engine, shown low on the block near the overheat warning switch.
What components are shown on the LH side of the 7.3L diesel engine?: Figure 2 identifies the Tach Speed Sensor (optional), Fuel Line Heater Connector, Overheat Warning Switch, and Coolant Temperature Sensor on the LH side of the engine.
Where are connectors C187 and C188 located?: Figure 3 shows connectors C187 and C188 on the right-hand (RH) side of the 7.3L diesel engine, in the wiring harness near the alternator area, with an arrow indicating the front of the engine for orientation.
What system does this manual page cover?: The page is titled 'START/GLOW PLUG CONTROL/RUN (DIESEL)' and provides component location diagrams for the diesel start and glow plug control circuits on the 7.3L diesel engine.