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Blend door

awc on Sun April 28, 2013 7:18 PM User is offline

Year: 97
Make: Ford
Model: Ranger
Engine Size: 4.0
Refrigerant Type: 134
Country of Origin: United States

With it in Vent or heater mode etc it blows hot with no temp control. So I Thought I had the Temp Door Problem. What got me is when I ran the ac it still blows cold? Thought it would have still blew Hot. The Temp control still doesn't work with the ac, as in making it warmer. Just thought it was weird that the ac still blew cold if it was stuck on hot.

GM Tech on Sun April 28, 2013 9:32 PM User is offline

Does your truck use a heater shut off valve that shuts off coolant flow to the heater core when a/c is commanded?- or when the temp door is on full cold? This would explain your issue.

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

NickD on Mon April 29, 2013 7:09 AM User is offline

More than likely would blow a lot colder if that blend door was fully closed, recall Ford had a TSB on some of their vehicles around this period of time by using a poor piece of plastic in the blend door that would warp. But don't recall if the Ranger was one of them.

Don't dare add a shut off valve, would starve the engine from coolant, heater core can be bypassed however. Believe this vehicle employs that evaporator box concept, a PITA to remove that, because that is where the blend door is located in. System has to be recovered to replace that blend door. Had similar problems with the GM equivalent with blend door problems, least I didn't have to recover the refrigerant, but did have to remove the entire dash to get at it.

That door was metal, but all of that rubber weather stripping rotted off.

awc on Mon April 29, 2013 7:17 PM User is offline

It does have a HCV. Moving the Temp control from Hot To Cold etc makes no change in Temperature. I thought I had a blend door issue because the Temp control doesn't seem to be working. But when I turned the ac on it blew cold! I thought if the blend door was stuck on Hot the ac wouldn't blow cold.

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