I have 185K miles on a 95 SL2 Saturn. When scanning, I get a 74 code fairly consistanly. At idle when the temp reaches half way on the temp gauge the fan will come on and cool the engine off, however, that is only sometimes, lately the fan wont come on, or I can turn the engine off and let it set a few minutes and turn it back on and the cooling fan may be running from the initial start. The fan seems to be intermittant.
when you get a "engine coolant temp/transaxle temp" soft flag, what does that specifically mean and where is the temp sensor for the transaxle or tranmission lacated when regarding this code. I notice one outboard of the transaxle and another located close to the speedometer cable. There are two engine temp sensors. One is a single wire and one is a two wire. Which one is associated with this code? I know my fan relay could be bad, but it does come on sometimes. Could the temp sensors be causing a problem related to the 74 code? Could I have more than one bug. The car sometimes will miss while driving say 55 or it may miss at idle, but just for a second and then run fine for some time either at idle or with a load. I did find one of the four wires melted through to the shield, so that could be part of the seldome miss fire. This is my wifes car. Initially, I took it to Saturn to get a fan blower motor and talked to the mechanic about this loose clinking noise under the car and when on the rack you could hear it when hitting the catalitic converter. He recommended an after market and then scaned the car and found the 74 code. He recommended as a start to replace the engine temp sensor and transaxle sensor, so I bought the two sensor and connectors with pigtails. I haven't done that yet, all this intermittant overheating and some missing showed it self while driving to a muffler shop and has been happening after the cat was installed. Any information you have would be appreciated.
have the same problem?
Sunday, March 6th, 2011 AT 4:55 AM