getting max. heat on all settings including fresh air high & low air flow.eng.temp ok I'm stumped.
Feb 19, 2007 at 9:55 AM
1997 Ford Ranger Constant Heat
JIMRB66
- MEMBER
- 4 POSTS
can you explain a little better , you stated max heat but hi and low fan operation works ??
thanks
thanks
Feb 19, 2007 at 10:02 AM
All fan settings work ok.just constant heat no matter where I set temp control!!inside or outside air settings don't make a differnce!!
jim
jim
Feb 20, 2007 at 8:19 AM
if your handy with an ohm meter i can help more , if not you can hunt around under the dash move the mode switch around and see if you hear the blend doors opening or closing , also check for vacuum leaks under there , let me know about the ohm meter you will need that to check the temp control unit
Feb 20, 2007 at 8:24 AM
I don't have a ohm meter,I'll check out under the dash for vac leaks.maybe a friend has a meter will get back to you.Thanks for the help !!
Jim
Jim
Feb 20, 2007 at 8:37 PM
you may look out under the hood at the passanger side and see if all your vaccum lines are intact. the red line will come from the intake manifold to the vaccum canister and the black is the feed to the inside of the cab. if thoes a good, the selector inside the cab has a vaccum switch on the back of it and sometimes come apart from use and will leak vaccum. thus keeping the vaccum doors from working. in some cases you can hear vaccum escaping from the switch. 8) NOS
Feb 21, 2007 at 2:43 AM
I found info with the exact same problem I have.It seems the heater box blender gate is broken,this is common in ford trucks.how do I fix this?
Jim
Jim
Feb 22, 2007 at 8:54 AM
do you know where the door is broke? it really depends on where the door is broke as to weather it can be repaired.it might be better to find the whole thing at a salvage yard rather than trying to fix it. 8) NOS
Feb 23, 2007 at 11:36 AM
Suggested Repair
Check under-hood and under-dash vacuum lines and the temperature selector vacuum switch. If the heater-box blend door is broken, replace the heater box or blend-door assembly, often from a salvage yard, rather than attempting a partial repair.
Conversation Summary
The owner of a 1997 Ford Ranger 3.0 reported constant maximum heat on every temperature and air-source setting, while all fan speeds worked and engine temperature was normal. Experts advised listening for blend-door movement, checking for vacuum leaks, inspecting the under-hood vacuum lines and cab selector vacuum switch, and testing the temperature control with an ohmmeter. The owner later identified a broken heater-box blend door, and an expert said repair depends on the break location and that replacing the assembly from a salvage yard is often better.