Question about Cars & Trucks
On automatic control heater fan runs when truck s warming up drive for awhile shut engine off come back a few minutes later there is no fan running when I know the cab is not up to set temp on the control. Sometimes it never comes on when cab is not a set temp.
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Posted on Jan 02, 2017
It could be a faulty thermostat. Did it do the same thing before u replaced the t-stat? It sounds like it's sticking closed, then all of a sudden it opens, coolant flows correctly. I'd consider changing it again. Check to make sure parts store is giving u the correct temperature thermostat also. Maybe it's too high for your Ford, delaying the opening.
Posted on Nov 25, 2008
I had the same type of problems with my 96 PA and went to the dealer with it to see what it would cost to repair. The machanic couldn't look at it for weeks but told me to disconnect the battery terminals and hold the two terminals together for thirty seconds. This dichanges all the capacitors in the car and allows the systems to reset. If you do this, don't have your keys in the car because sometimes the automatic door locks lock. Doing this fixed my heat problems immediately and that was two years ago with no problems since. No garantee but it worked for me and cost nothing to try. You will need to reset the clock and radio presets after you try this. Good luck, Paul
Posted on Dec 27, 2008
SOURCE: no heat
No Blower in Floor Mode
A customer arrives with a 1983 to 1995 Full Size Ford, Lincoln, or Mercury
automobile with automatic temperature control. If the complaint is no blower operation when
the floor mode is selected, the vehicle may have a problem with the thermal blower lockout
switch also referred to as the CELO (cold engine lock out switch).
The thermal blower lock out switch is located in the heater core intake hose. The two
wire switch has a thermal element with a small set of contacts, the contacts are open when the
coolant is below 120°F and closed when the coolant is above 120°F. The thermal blower lock
out switch also contains a vacuum switch, which applies vacuum to the outside/recirculate
valve when the system is in the floor position. When the engine coolant is below 120 degrees
and the selector is set to floor position, the thermal blower lock out prevents blower from
turning on and closes off the outside air during engine warm-up. When the coolant
temperature is above 120 degrees, and the selector is set to the floor position, the thermal
blower lock out switch allows the blower to operate and opens the outside air door.
In order to diagnose this problem, test the thermal blower lockout switch with the
engine at normal operating temperature (above 120°F). Unplug the wire harness connector
from the thermal blower lockout switch. Using a 15-amp fused wire, jumper the harness
terminals to test the switch. If the blower comes on, the thermal blower lock out switch is
faulty. If the blower doesn’t come on, look for an open between the control head selector and
thermal blower lock out switch.
In some cases the blower may continually run even when the engine temperature is
below 120 degrees. Unplug the thermal blower lock out switch and if the blower motor turns
off, the thermal blower lock out switch is faulty. If the motor continues to run, look for a
short to power between the control head selector and thermal blower lock out switch
Posted on Feb 10, 2009
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
Posted on Jul 29, 2009
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