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    gramztcg's Avatar
    gramztcg Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 24, 2013, 04:59 AM
    Temp gauge goes down and rpms go down
    Temperature gauge goes down after driving awhile and now rpms seem to go up and down for no reason.
    Heat and fan seem to be working fine.
    No antifreeze leak.
    parttime's Avatar
    parttime Posts: 1,440, Reputation: 113
    Ultra Member
    		  
    #2

    Jan 24, 2013, 05:13 AM
    Hi gramztcg and welcome, you'll get a better answer if you post more info. Good luck
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #3

    Jan 24, 2013, 07:18 AM
    . The Ignition Control Module (ICM) may be failing.

    . The radiator's passages may be partially blocked by mineral build-up (phosphate scale). Replace the radiator and refill with 50/50 mixture of antifreeze and distilled water.
    Handyman2007's Avatar
    Handyman2007 Posts: 988, Reputation: 73
    Senior Member
    		  
    #4

    Jan 26, 2013, 09:25 PM
    Has this only begun to happen in this cold weather of late? If so, you may need to have a slightly higher temperature thermostat installed. AS you drive, the coolant may actually begin to cool in this colder weather. The varying of the rpms could be the temperature control of the engine compensating for the cooler engine. If you notice, when the weather is cold, the car idles faster on startup than it does at normal temperatures(60's and up). That is controlled by the temperature sensing circuit in the system control module (ECU). I don't thin it is a problem unless the temp gauge is dropping all the way down to cold.
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