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www.automotiveforums.com > ... > Chevrolet > Blazer A/C now turns on but will blow cold air for 5 seconds then back to hot for the same. ...It seems be be left of the heater box somewhere but it is definately inside. .... on this '98... the things just keeps turning in there, hot, cold, hot and so forth.
that happened to me the heater core went out ive read alot of different things about 03 galants most of them have the same problem it started with a grinding noise turning the temp contol, its actually the heater control motor value it causes the heater core to go out
Hi Don'a, here is a temporary solution; until the linkage is replaced. Make sure your heater is in dual mode and not turned up all the way. Then only use the face setting and close the driver vents. This will allow heat to circulate and not blow cold air onto the driver. If you use the floor setting or the defrost setting then the driverside takes over and it blows cold air. Good luck. In the mean time look at some of the other posts about this issue for part #. And if you have a mechanic that can work on it, he will probably be cheaper than the dealership.
Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.
Check the water contol valve operation ( under hood connected to heater hoses), do you have a full load of coolant?, also air mix door under dash, is the temp of the coolant hot?.Check them all out, you'll find it