I have a 2005 Impala and it has been acting funny. Some morning the heat takes about 20 minutes to start working. The air conditoner has not came on once. The gage also takes awhile to start working and when it does it goes pass the halfway mark.I even notice when im sitting at a red light, i can feel the engine shaking a little. I have a appt to get it check and put on the machine tomorrow. I just want to go there with an idea of what the problem could be. Could this be a thermostat or water pump problem???? Help?
Do you see any leaks the Front of the Engine or Radiator Area? is the Coolant Mixture Correct? Low Cost, Replace the Thermostat. From the Shaking you could also be in need of a Good Tune-Up? Also after all that shaking you might want to check the motor Mounts to make sure they haven't Cracked.
Sounds like the thermostat is sticking,
thermostat for your heat problem but why your engine is shaking I don't know why, they will find out when they put the machine on it.
99%odds on thermostat (or combination of thermostat and presure cap) is problem! If pressure cap not sealing properly, it is possible that no water is being pushed into heater circuit (water part)-- Lack of normal engine temperature would just aggrivagte the problem! I have yet to see a waterpump that worked too good,- so that an engine ran too cold! Really,-- a waterpump that is bad would make the engine run too hot, - and even that is unlikely unless something is broken inside where it can't be seen......... Most (bad) waterpumps leak enough water so that engine overheats from lack of water !! The reason engine shakes is because it is running too rich, -- the computer thinks it is still too cold to drive normally so the encrichment valve puts in more gas than normal-- (this is equivalent of a choke on normally carbureted engines), -- which are now history because of computers! Have cooling system pressure checked (including checking pressure cap), and get thermostat replaced, -- this will most likely take care of your problem!
