tm>Hi I also had a problem with my 1997 Eldorado Touring Coupe and it was
tm>heating up when going fast but not going slow. So I took it in and they
tm>said that I had a this that and everything else that you could think of,it
tm>cost me over $2000.00 dollars and it still over heated so then they said it
tm>was a head gasket and it would cost $4000.00 dollars to do both heads to
tm>play on the safe side. I thought that was to much and found a retired
tm>mechanic who did it plus a few other items for $2000.00 dollars but know
tm>it drives perfect at high speeds and just goes over a pinch in the middle
tm>of the heat guage needle,is that alright? Or should it be the same? Could
tm>it be a air lock in the system or could it be the thermostat is sticking a
tm>bit,heat valve,or clogged a bit?? please let me know and thank you!
The analog gage is fine but you don't see numbers.
You can monitor the coolant temperature on the DIC. Cycle thru it with the
Info button, it should be right after Battery Volts. It is not programmed
by the factory to show this info, though. Here is how, using your HVAC panel:
Yes = |Fan Up|
No = |Fan Down|
Ignition key in "Run" (engine may or may not run).
Hold |Off| & |Pass Warmer| simultaneously to start Diag mode.
Everything lights up on the IPC, then diag codes are rolling.
You may want to jot down the codes, but they are irrelevant for our
purpose. After going thru all codes, you'll get a prompt:
IPC? Yes <==IPC DATA? No
IPC INPUT? No
IPC OVERRIDE? Yes <==IPCS13 86 No
IPCS12 77 No
IPCS11 0 No
IPCS10 99 No
IPCS09 0 No
IPCS08 73 No
IPCS07 73 No
IPCS06 0 No
IPCS05 43 <==== At this point, with the |Pass. Warmer| button
change this number to 111.
Save this value by pressing and holding the |Front Defrost| and |AC| buttons
simultaneously until the number 111 on your DIC blinks once. Then enter "No"
(Fan Down). Answer with "No" to all remaining prompts, and exit diag mod by
pushing in the big |Auto/Temp| Dial or turning off the ignition.
Note: The IPCS** values appear in the trip odometer display.
Another note: By changing the "IPCS03 160" to 132 (w/ the
|Pass. Cooler| button, you can get rid of the Daylight Running Light "feature".
WARNING!!! Do not do it if you are not sure you *can* do it. If you screw up,
the IPC must be replaced. If you've started the process, and think you've made
a mistake or you want to abort it, hit the |Off| button, answer "Yes" to
the IPC CLEAR CODES? prompt, exit diagnostics and start over.