The blower works fine, but the heat no longer works. I also noticed the temp gauge fluctuating between 1/2 way and 3/4 while driving. A week ago, the heat was intermittent. Any ideas?

hello has anything been done to the cooling system lately??is the radiator full??it sounds like possible air trapped in system.might want to try bleeding cooling system

No work has been done, radiator is full.

how many miles on car??

65k

hey GC i still would try to bleed system.i dont no if there is a bleeder on your car look on thermostat housing for one.but if nothing has been done service wise i dont see how it got air bound.does car overheat you said 1/2 - 3/4 on temp gauge.

I just noticed today, while driving, the temp gauge was at 1/2 way and then moved to 3/4 way, and then dropped back to 1/2 way, all in about 30 seconds of driving. Once again no service has been done.

Is there a bleeding valve for 2004s? And if so, how would you do that. Should I just change the thermostat w/ gasket?

i not sure if it has a bleeder but look around thermostat housing.if so with engine running open bleeder to release air/bubbles.(may take awhile)if coolant has'nt been change in awhile then i would change + thermostat.there's been talk about drilling 1/8 hole in top of thermostat if not already done to help with air

I figure I will change the thermostat (never done it before). Can you tell me where it is located? I followed the upper hose the engine, but nothing looked obvious - in fact I thought some type of spark plug wire case was there - didn't look too long as it is getting real cold. Any help would be appreciated. Also, do you have to drain fluid to change it?

it should be below the coil pack follow the upper rad hose

Do I disconnect the upper rad hose to get to it, or do I take the coil pack off?