97 gt frustrating fan issue

Sickgirl77

New Member
Dec 21, 2019
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Big island va
Frustrated Husbands stang.97 gt with 99 4.6..bare w/me trying to help hubby.the initial problem was the hose to temp sensor thats located on back,busted.replaced hose&sensor.never overheated but temp to high.so replaced thermostat.still to high.tested fan.runs with front temp sensor unpluged.replaced temp sensor&harness.still to high.water pump and radiator was replaced about a year ago.we have read about ccrm,is this our last resort?and if box is bad,wouldnt it effect fuel pump(replaced),clutch(replaced) and the other relays associated?cause those things are fine.ty in advanced for any advice
 
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COramprat

Drone Driver
Mod Dude
Mar 2, 2003
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Are you saying the car is not overheating but temps are high? If you lost coolant you need to "burp" the system. Air gets in and causes it to overheat.
 

Sickgirl77

New Member
Dec 21, 2019
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Big island va
Are you saying the car is not overheating but temps are high? If you lost coolant you need to "burp" the system. Air gets in and causes it to overheat.
Yeah the car is NOT overheating but temps rise high,especially in city,in a drive thru ect.fine when at high speeds like highway.
 

General karthief

wonder how much it would cost to ship you a pair
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Aug 25, 2016
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The cooling fan has two speeds. it may be only on low speed and not switching to high.
you can also install a manual temperature gauge temporarily to compare to the factory gauge.
 

wmburns

SN Certified Technician
Aug 14, 2009
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I have helped more than one person who THOUGHT they had an over heating problem that turned out to be electrical in nature. IE a poor ground CAUSING a false high temperature reading. In some cases people "part swapped" the complete fan control and cooling system before reaching out for help.

Recommendation. Don't load up the parts cannon in an attempt to "part swap" to a solution. Cover the basics first. Test as much as possible. Then repair.

Howto perform charging system voltage drop test

Confirm that the cooling fan works on BOTH speeds. One method is to test by jumping the fan directly from battery power.

NOTE, the CCRM is multiple relays under one cover. It's quite possible for one relay to fail while the others work fine.

Hands down the easiest way to test this is with a bi-directional ODB2 scanner. With a bi-directional ODB2 scanner it's possible to "command" the various speed fans to run and then actually see what happens.

Even without bi-directional control just being able to see the various PID's such as ECT and called for fan speed are very helpful in trouble shooting.

Here's some information on an affordable Windows based unit.
ForScan ODB2 scanner w ELM327 USB
 
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