Heat blowing cold on one side

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11-05-2007, 09:40 AM

MYSSMONTE

Thread Starter

Join Date: Nov 2007

Location:

Posts: 3

Heat blowing cold on one side

When I turn on the heat in my 04SS Monte and put the controls for each side all the way up on heat, it blows cold airon the driver side and hot on the passenger side.Has anyone came across this problem or does anyone have a clue what it may be?

11-05-2007, 09:49 AM

BeachBumMike

Join Date: Dec 2005

Location: SpaceCoast, Florida

Posts: 16,095

RE: Heat blowing cold on one side

Hi Lee, & Welcome to the MCF

I'm sorry that you first post has to be about a problem : (

I hope the below information gives you some insight into the

possible problem. If not, please be patience, & I'm sure

one of our expert member's will post also.

Good Luck, and I hope you come back and learn more

about the awesome Monte Carlo's : )

[:-]

The a/c and heating systems on cars today are pretty complex. 10 years ago replacing the thermostat usually did the trick, but today there are electric motors that operate the "blend doors" inside the dashâ€¦directing air flow from the heater core and A/C evaporator core to the cab of the vehicle. Always start by checking the actual coolant level inside the radiator itself to make sure it is full.

Then feel the upper and lower radiator hoses to see if they are hot (when the engine has been running awhile and has reached normal operating temperature), then feel the two heater hoses leading into the cab of the vehicle to see if they are both hot as well.

If you feel a drastic difference in one of the radiator hoses, I would try replacing the thermostat and see what happens. If all the heater and radiator hoses are pretty much the same temperature I would suspect there to be a control problem in the dash controls or in the blend door operation and a visit to you dealer or a qualified mechanic is my recommendation.

Here is more about heaters.

Why is My Heater Not Hot