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- - strange jeep issue (http://www.njfboa.org/forums/showthread.php?t=48997)

strange jeep issue

my recent jeep purchase did very well on the 5 hour drive back to base last night, but i did notice a few things..

first, the temp gauge barely moved from around 160, not sure if it was correct of just not reading. today ill look to see if it has moved back down. it was 10 degrees driving up here. Either way, im not too concerned about that.

second, and this is the odd one.. when i accelerate past 2,000rpms, the blower fan for the heat-a/c shuts off. once it drops under 2k rpms, it comes back on. it doesnt matter which setting either, high low or in between. its nothing major and heat worked good otherwise but i just found it strange. why would it do that?

Quote:

BLOWER MOTOR SWITCH
The heater-A/C blower motor is controlled by a rotary switch mounted in the heater-A/C control panel. On vehicles with manual temperature control systems, the switch allows the selection of four blower motor speeds, but will only operate with the ignition switch in the On position, and the heater- A/C mode control switch in any position except Off. On vehicles with Automatic Temperature Control (ATC) systems, the switch allows the selection of Lo, Auto, Hi Auto, and an infinite number of manual speed settings between Lo and Hi.

On manual temperature control systems, the blower motor switch is connected in series with the blower motor ground path through the heater-A/C mode control switch. The blower motor switch directs this ground path to the blower motor through the blower motor resistor wires, or directly to the blower motor, as required to achieve the selected blower motor speed.

On ATC systems, the blower motor switch is just one of many inputs to the ATC controller. In the manual blower modes, the ATC controller adjusts the blower motor speed through the power module or the high speed blower motor relay as required by the selected blower switch position. In the auto blower modes, the ATC controller is programmed to select and adjust the blower motor speed through the power module or the high speed blower motor relay as required to achieve and maintain the selected comfort level.

The blower motor switch cannot be repaired and, if faulty or damaged, it must be replaced. The switch is serviced only as a part of the heater-A/C control assembly .

manual or auto hvac? i'm guessing either 4 position knob or an electronic fancy computer thingamajig

i have the manual version. the other one is a digital setup where you select exact temp.

however neither of them should be affected by engine rpm.

and as for the temp gauge, seems to be working fine, i guess the engine just stays under 160 degrees.