[200q20v] Running Hot

Tue Aug 21 12:14:08 EDT 2001

SHORT VERSION: I'd suggest that you warm up your engine by driving around 
town with the air conditioning set as cold as you can make it run. This 
forces the rad fan to run.  Then, stop the car with the engine and air 
conditioning on, and open the hood, and see if the rad fan is 
running.   Then, turn off the hot engine and see if the fan that you hear 
is the rad fan or the after-run fan.

Maybe your radiator fan wasn't running.  That would be the most probable 
cause of overheating IMO.  Now, what would cause a rad fan to not run? Try 
turning the fan blades on the cold motor, to see if the fan motor is 
seized. Don't do this with a hot engine.

IF THE BLADES CAN BE TURNED EASILY BY HAND,  find out if the rad fan will 
run by itself: (See SHORT VERSION above). Or you could jumper the fan motor 
with the engine off, and see if the rad fan  runs. If it it is seized or 
doesn't run with a proven power supply, then you need a new fan motor. 
Don't jumper it very long, because you could burn out the harness if the 
fan is already seized.

IF IT RUNS with proven power supply, but not when the engine and AC are 
running, then the system of fuses and wires and relays and the temperature 
sensors are suspect. Something in the system isn't doing its job. They all 
have to be tested, including the fusible link that protects the rad fan 
from burning up if it seizes up while running.

The after-run fan you heard is probably the auxiliary fan that blows air 
over the fuel injection lines, to avoid vapor lock.

Doyt

 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.
At 10:43 AM 8/21/2001 -0400, you wrote:
>While driving my '91 200q wagon this past Sunday in 90deg heat through
>stop-and-go traffic, my temperature gauge was well above normal and the
>warning indicator came on as I (fortunately) got close to home (ran the
>heater to draw heat off of the engine).  Any ideas before I get home and run
>the "codes".  Fluids are topped off, cooling fan came on after I parked...
>
>My wife now reports that the climate control system "surges" - blows hot
>when windows are closed, ac pumps when you roll down a window.....?
>
>Thanks in advance!  The "list" always comes through.
>
>-RJM-
>
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