Climate control causing windows to fog

[Cbierniat]

i have a gtp with dual climate control

[Cbierniat]

Wheres teh cabin filter??

[BNaylor]

Originally Posted by Cbierniat

i have a gtp with dual climate control

That's what I thought. Remember working with you on past problems. When you turn your heat to high do you get good, reasonable heat after the engine has warmed up? The key to proper defrosting or defogging whether its digital climate control or manual is raw heat.

The digital climate control is supposed to delay blower operation for approximately 2 to 3 minutes to give the car some warm up time before turning on the blower when it is cold outside based on outside temperature. It uses external and internal temperature sensors. Also when it is 40 degrees or less the compressor is inhibited from operating by the PCM referencing to the engine coolant temperature sensor (ECT) and external temperature sensor.

Other than a missing vaccum source which would cause the vents not to work properly, I would agree with Lynn (GTPDad) that it is possibly heater core related. You could have air in the cooling system or the core is blocked/clogged. Another possibility is the thermostat. A 195 degree thermostat provides a faster warm up time than a 180 or 160. For winter operation you should use a 195. By allowing faster warmup, you will have heat faster which should minimize the windows fogging up.

[BNaylor]

Originally Posted by Cbierniat

Wheres teh cabin filter??

Checkout the following link. You may not have one unless installed by the previous owner(s). '97 - '03 Grand Prixs did not have one stock.

http://www.mccgp.com/upgrades/cabina...air_filter.php

[Cbierniat]

my passenger side floor is wet w/e its wet outside ive noticed too

[BNaylor]

Originally Posted by Cbierniat

my passenger side floor is wet w/e its wet outside ive noticed too

Thats a common problem due to bad passenger cowling seals and the lack of a cabin air filter. Water drips down the inner part of the firewall. The cabin air filter provides additional sealing over the blower intake in addition to filtering air drawn in.

Another reason could be a clogged evaporative drain. Also check to make sure it is not coolant.

[Cbierniat]

whats the passenger cowling seals? Do you think ishould try that first or what do you think i should do first

[BNaylor]

Originally Posted by Cbierniat

whats the passenger cowling seals? Do you think ishould try that first or what do you think i should do first

This link I provided earlier should show the seals. The main one goes from the driver's side to the passenger. It has to be pulled away when checking cabin air filter or removing the plastic cowling to inspect the air intake system. There are also smaller seals on the sides of the cowling. Best thing to do is remove per the link and perform an inspection.

http://www.mccgp.com/upgrades/cabina...air_filter.php

[Cbierniat]

Do you think it could be that the dual climate control computer is bad ??? Theres two lights out on it i konw that dont means its bad lol but im just sayin..my uncle said it might be why it doesnt swtich to any settting>>>


Another thing while the air/heat is off...if u hold both knobs for like 5-10secs some numbers pop up and u can change em with the knobs wtf is that lol??? thanks

[BNaylor]

Originally Posted by Cbierniat

Do you think it could be that the dual climate control computer is bad ??? Theres two lights out on it i konw that dont means its bad lol but im just sayin..my uncle said it might be why it doesnt swtich to any settting>>>

Another thing while the air/heat is off...if u hold both knobs for like 5-10secs some numbers pop up and u can change em with the knobs wtf is that lol??? thanks

It is possible the head unit is bad but for most owners it is hard to tell. The digital climate control system runs self-diagnostics on itself and external components like sensors. If the "F" symbol flashes it indicates failed testing. In turn it will store a two or three digit DTC error code.

The codes can be accessed by going into manual diagnostics mode. Ignition to on, then press AUTO and OFF buttons at the same time. There should be two display modes. Diagnostic pointer and diagnostic value. Rotate fan knob to the detent in either direction. The DTCs, if any, are stored under diagnostic pointer 00. If more than one code, they are flashed in one second intervals per fault. Rotating temp knob will switch diagnostic pointers, etc.

[troy1]

on grand prix's you hold in both temp knobs, if there is a code the little man flashes