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Old 08-22-2007, 06:28 PM
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rjk rjk is offline
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Join Date: Oct 2002
Location: Atlanta metro area
Posts: 199
Thanks for the info.

T-stat is a month old (replaced when a "mechanic" told the wife that was her problem).
Radiator is less than 2 yrs old.
Pressure cap is good & system holds pressure (I have a Stant pressure tester).
A-Frz is new & properly mixed (done when t-stat was replaced, I checked it w/hydrometer)).
So that leaves the fan coupling...hmmm.

No bubbles in freon & air coming through vent is cold even w/blower not engaging. Nice and cold when it does engage.

I'm not sure which sensor is for which but correct me if I am wrong here.

The sensor in the T-stat housing with 3 terminals is for the dash gauge?
No continuity between any terminals nor between any terminal & ground.

The sensor sitting vertically in the water passage of the intake manifold w/2 terminals (front-drv side of engine under the air filter) is for the electric fan?
If so then the resistance of the sensor is 2.51k @ 90-95F ambient air temp. Tested it when I got home after a long hot day in the driveway, coolant must be at least that temp.
Resistance too high?

Where is the fan relay?

I see mention of an A/C lock out sensor in the parts section, is it what I think it is? Cuts off the A/C when the engine temp is too high? Or am I thinking too much?
I also see an Aux Fan Switch (1 terminal) mentioned that looks like the sensor mounted next to the 3 terminal sensor in the t-stat housing (it also looks like the A/C lock out switch). No continuity here either between terminal & gnd at 90-95F ambient air temp.

Thanks

K
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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
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Last edited by rjk; 08-22-2007 at 08:02 PM.
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