The fan is definitely blowing and moving air. It works on low all the way up to high. I can’t remember if the air flow switched to the defrost or not. I’ll try it again tonight.
From: G Mann [mailto:g2ma...@gmail.com] Sent: Wednesday, January 14, 2015 11:10 AM To: Donald Snook; Mercedes Discussion List Subject: Re: [MBZ] OT 1992 Ford F-150 As owner of 3 F350's and one F450 all in the same year range as your F150, I'll step in with some experience. Ford used the same HVAC system on all the F models so should be good. First, check at the firewall, passenger side, almost under the hood hinge. There is a small vacuum pot there that opens the blend doors. Very often the hard vacuum line that goes to that pot is cracked, or the rubber tube that connects it is cracked from engine heat and age. If the line and hose is good, start the engine and have your helper turn on heat .... then air.... while you watch for vacuum pot operation. If it doesn't move, it's failed. Move it by hand and hold it in position [I use a tie wrap for solo test]. Then check for heat flow inside. If that test fails, your options go to the blend door it's self inside the cover under the glove compartment. Since you are not getting hot or cold air.. I suspect that has failed closed. Are you getting any air flow out the vents? Defrost vents blowing even cold air? Can you hear the fan running? Fan failure is another common fault. On Wed, Jan 14, 2015 at 9:50 AM, Donald Snook via Mercedes <mercedes@okiebenz.com<mailto:mercedes@okiebenz.com>> wrote: I know a few folks on here have older Ford Pickups or had them previously. So, here is a question for them. I have a 1992 Ford F-150. I bought it last summer because my wife and I were going to a lot of estate sales and it seemed like we were constantly needing a truck. It's a decent truck with 144,000 miles. The body is straight and rust free. It needs a few things, but for the most part, it will just be used occasionally for hauling or moving stuff. BUT, it has NO heat. The fan comes on, but never gets warm. I checked the coolant and it is full. I suppose I could start with a thermostat. It seems like I remember something on the blend doors (I may be using the wrong term) on some old fords. Is that an issue on these? What else could it be? The a/c also doesn't work. When it was hot, I turned the a/c on and it didn't cool. I checked and the clutch wasn't turning on the compressor. So, I gave it a tap and the clutch started turning. But, it never cooled. I filled it with 134. But, never did get cool. The a/c is obviously a non-issue for a while. But, NO heat is a little rough this time of year. Donald H. Snook _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor. _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com All posts are the result of individual contributors and as such, those individuals are responsible for the content of the post. The list owner has no control over the content of the messages of each contributor.
