![]() ![]() The 89-93 Mustangs (and the 94-95’s as well as some ’88 MAF equipped Mustangs) will allow you to use a jump wire and count the check-engine light in the dash. Using The Check-Engine Light (89-93 Mustangs) The 86 to 88 Mustangs will need a jumper wire from the STI (test input) with the #2 pin on the connector (I’d use spades) and you can hook your light to #4 on the connector and (+) to the positive battery terminal. when the prongs become scaled, the circuit is broken and the. the liquid in the res completes the circuit between the prongs to keep the light off. So for code example “21”, you will count two flashes, a 2 second pause, then a single flash, if there’s another code – it will pause 4 seconds. pull the sensor out of the coolant res, the black plastic part, soak the bottom end (has two metal prongs) in vinegar for a half hour or so, then rinse it off completely. Fill up the radiator with distilled water and run the engine. This video shows where the radiator drain plug (petcock) is located on a 1999 Ford Mustang. My reservioir is full but my LOW COOLANT light is on.To get a code digit: There’s a 2 second pause between digits and 4 second pause between codes. Start your coolant flush by draining the coolant / antifreeze that is in your reservoir, then drain the coolant that is in your radiator by opening the petcock or removing the lower radiator hose. ![]() It may take patience to do so but doable. If you don’t have a code-scanner, you can count the signals and find the codes that way. Typically, the coolant temperature under typical drive conditions is 80. Slowly pour coolant into the reservoir until it reaches the full line. Next, locate the coolant reservoir and unscrew the cap. Locate the radiator cap on the front of the engine and remove it. First, make sure that the engine is cool before beginning. Another issue related to a coolant flight flashing is that you may have engine overheating issues. Adding coolant to your Ford Mustang is a fairly easy process. Counting Digits to Get Your Trouble Codes After starting the engine and allowing the coolant to warm up, the coolant level in the reservoir may increase enough to switch off the coolant light. ![]() You can easily grab your trouble codes, and this will help you diagnose your MIL or “Check engine ” light on that fox body Mustang of yours! Note: Make sure your engine is warmed up before doing these tests. This range may vary depending on the model year. How Much Does a New Transmissions Cost The average cost for an aftermarket or rebuilt transmission for a Ford Mustang could be over 3500. The small pigtail is the self test input (STI). According to RepairPal, the average cost of a Ford Mustang coolant change is between 80 101 (excluding taxes and fees). The large connector contains the self test output (STO) and ground (SIG RTN). The fox Mustang’s EEC IV computer has two connectors for self-testing and located on the driver-side firewall. ![]()
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