Question about 2005 Pontiac Grand Prix
Are you having problems shifting? If not, your transmission if probably fine. You may have a faulty Vehicle Speed Sensor though.
As far as the heat problem, it may just be low on coolant. It may not overheat, but there is not enough to get up to the heater. Thermostat may be stuck open, or your heater core may be plugged. One of these may be the answer if it is a new problem, if it does it every year, it may not have a hot enough thermostat. Water level first thing, then thermostat. You can try covering 1/2 of the radiator with a piece of cardboard. This will cause the coolant to heat quicker, but be careful it doesn't get too hot. Also, your heater core could be going bad, but this is less likely, and more expensive to fix. Start by checking the coolant and topping it off. If the coolant is fine, get a new thermostat.
If the switch is only working on the face and feet setting, your Fan Switch may be going bad.
Posted on Mar 14, 2011
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Posted on Jan 02, 2017
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Apr 09, 2011 | 2005 Pontiac Grand Prix
Most transmission problems are caused by the transmission oil getting old and sticky. There are valves in the valve body that are precision fit and need good lubrication to work properly. When problems start they are usually caused by a valve getting stuck and not moving into the position it is suppose to be in...
I recommend a flush to remove all the old fluid with new. There are many auto repair shops that will perform a flush, but you want to be sure they run a cleaner through your transmission first, as that will clean out the sticky old deposits that are causing the valves to stick. If they do not offer a cleaner you can do it yourself. I recommend BG's transmission cleaner. It comes in a dual pack of cleaner before the flush and conditioner after the flush. You can often find these on eBay or Amazon, as most auto part stores don't carry these products. BG sells their products to the shops that perform the flush, so they are not easily available in stores, just auto repair shops.
Good luck :O)
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