Fluctuating Temperature Gauge
If your temperature gauge is fluctuating from normal to hot and back to normal and your heat temperature is acting the same way, don’t blame the thermostat like most people do. It could be as simple as the cooling system low on coolant/antifreeze. To check this let the vehicle cool down, preferably overnight. Once the vehicle is cool, open the radiator cap (not the reservoir) and see if it is low. It should be filled to the top, if not add coolant as needed, usually at least one half gallon. This should correct the condition. After this, keep an eye under the vehicle for spots because the low coolant condition can be caused by a leak. If you do see a leak, you will have to take it your shop and have it diagnosed.
Drive Safely
Matt
November 13th, 2008 at 10:56 am
Thanks for the quick advice!
January 23rd, 2010 at 5:40 pm
That’s a pretty great post, i was studying something similar on another website not too long ago that essentially said the same thing although yours is clearer, plus its nice to have some validation on seeing two resources acknowledge it.