I restarted the car at the first light, and everything returned to normal. When I got home I pulled code 00348A: Map Thermostat - stuck open. My current mods: BMW Stage 1 tune, ER intercooler & CP, CSF radiator, PE. Water pump & thermostat were replaced 2k miles ago. ...
A stuck open thermostat will not provide enough heat to properly operate the vehicle heater. Therefore an inoperable heater is a symptom of a stuck thermostat. Testing Check your coolant level when the engine is cool and top it off if needed before proceeding. Low coolant levels can mimic ther...
I replaced the thermostat housing/water outlet. Filled system. Started and allowed to warm up for 20-25 minutes. Idled perfectly. Temp came up to proper level. No leaks. Shut off. Next day started it to take it somewhere. As soon as I stepped o... 2005 Ford F150 XLT 5.4 Triton P...