when i put my foot on the gas it goes back to normal.i check to see if i have any leaks,i dont have any leaks,i just change the radiator in may,and change the thermostat in july.i was told i have a electrical problem. how can that happen....need helpWhen i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?sounds like the secondary cooling fan is not turning on. Pop the hood, and have someone apply gas in the parked position(make sure to put the parking brake on). ask them to stop applying gas. If the secondary fan does not turn on withing 30 seconds, then that's the problem. Most of the time this can be fixed just by cleaning the contacts and putting the fan back in. But if it is the fan, the most you should be out is about 70 bucks.When i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?sounds like the sensor on the radiator is outWhen i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?Make sure your radiator's electric cooling fan is coming on when your stopped in traffic. It's needed to cool the radiator when your not driving down the highway.When i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?Yes your car is crazy, no it sounds like the ground wire on you sensor probe could be loose.When i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?could be a bad thermostat. just cause its new or recently new doesn't mean its still good. seen brand new parts fail instantly many a times.
otherwise sounds like a electrical problem between radiator and gage or even a faulty gage. if it bounces, then most likely electrical. if it goes up n down slow, smooth, then most likely thermostat again, or even could of been the wrong thermostat installed or even worse, put in upside down.When i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?You might want to check the thermostat. This is the radiator's sensor for you to know how hot it is. If it is old, or your old radiator overheated before you changed it for a new one, it may be damaged. Check that first. Also check to see if you have enough coolant IN the radiator.When i drive my hot and cold needle keep going up and down.when i stop the needle goes up.?I'd go for a bad fan sensor or relay first, Radiator fins bent not allow enough air flow, a/c fan is working when moving but at stops it's not enough to keep things cool. With the a/c on and the engine warm both the a/c and engine fans should be running. If when they put in the thermostat they used sealant, the wrong kind and too much it could have melted off and be jamming the new thermostat.
