Constantly foggy windshield.

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Jul 31, 2008 | 06:08 PM

#16

rollerstud98

Logistics Pro

Joined: Sep 2006

Posts: 4,863

Likes: 4

From: Airdrie Alberta

first thing that came to my mind was heater core when i saw the topic, then especially when you described the smudging on the windshield definitely sounds like heater core to me. This is something that is sometimes worth it to take a weekend and do yourself. save some coin although they usually are a bitch to get at on trucks with passenger air bags

Jul 31, 2008 | 07:23 PM

#17

97Handshaker

Senior User

Joined: Apr 2006

Posts: 435

Likes: 0

From: northern michigan

i agree it could be the heater core.

check to see if youre low on engine coolant. that would be a indicator

Aug 1, 2008 | 04:03 PM

#18

AAK625

Thread Starter

Senior User

Joined: Jun 2008

Posts: 107

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From: Ft. Lauderdale, FL

OK, stupid question. What's the heater core's purpose?

Aug 1, 2008 | 04:19 PM

#19

KingRanchMan02

Posting Guru

Joined: Oct 2005

Posts: 2,209

Likes: 1

From: Louisville, Kentucky

The heater core is connected to the engine's cooling system. Hot engine coolant circulates through it for the purpose of heating the truck during the winter months. It also allows the air conditioner to regulate the temperature in the cab by blending some hot air with the cold air to obtain the desired air temperature. This is done by the blend door which is controlled by a stepper motor that is controlled by the temperature ****.