Mechanics

VEHICLE OVERHEATING AT STOP SIGNS OR WA

1996 Dodge Intrepid

Engine Cooling problem
1996 Dodge Intrepid 6 cyl Front Wheel Drive Automatic 15000 miles

We have check the termostat, waterpump, hoses and have removed the radiator and tested flow rate but seams the fan does not come on. The fan runs when hot wired. Is there a sensor that turns the fan on at a certain temp or is it controled by the computor through the heat indicater sending unit?
Cant find any other answer to the problem.
The temp will go to 230 going into radiator and 150 coming out the other side that is why I thought it may be the radiator but it was not.

updated 11/30/09
Thanks a lot we found fuse blown and 1 fan very week and have resolved the problem.
Avatar
Samson2
November 28, 2009.




CONCORDE, INTREPID, LHS, NEW YORKER & VISION The dual cooling fans operate simultaneously and are turned on whenever coolant temperature sensor or A/C pressure transducer (on compressor discharge line) sends a signal to the Powertrain Control Module (PCM). The PCM turns on the fans through the low and high speed fan motor relays. When A/C is not operating, cooling fan operation is controlled by coolant temperature sensor signal to PCM. Signal indicates when coolant has reached a specified temperature. See COOLING FAN OPERATING TEMPERATURE (CONCORDE, INTREPID, LHS, NEW YORKER & VISION) table. Fans will operate independently of coolant temperature when A/C pressure signal reaches a predetermined level. Fans will not operate during engine cranking, regardless of coolant temperature. High and low fan speed relays are in the relay box under the hood. Concorde, Intrepid, LHS, New Yorker & Vision 1. Check for loose connections at fan motor and fan motor relay. If all connections are okay, check for Diagnostic Trouble Codes (DTCs). If DTCs are not present, go to next step.  TESTS W/CODES - 2.5L (for Sebring Coupe & Avenger)  TESTS W/CODES - 2.5L (for Cirrus & Stratus)  TESTS W/CODES (for 3.5L LHS)  TESTS W/CODES - 3.3L (for Concorde, Intrepid & Vision)  TESTS W/CODES - 3.5L (for Concorde, Intrepid & Vision) 2. With ignition on and engine at normal operating temperature, check for battery voltage on both sides of cooling fan relay fuse. Cooling fan fuse and high and low cooling fan relays are located in fuse/relay block, in front of left strut tower. See Fig. 8 . 3. If battery voltage is not present, repair shorted or open Red/Light Green wire circuit. If battery voltage is present, remove low speed or high speed fan motor relay. Using ohmmeter, ensure continuity exists between terminals No. 1 and 3. See Fig. 9 . If continuity does not exist, replace relay. 4. Connect battery positive to terminal No. 1 and battery negative to terminal No. 3. See Fig. 9 . Check continuity between relay terminals No. 2 and 4. Continuity should not exist with battery voltage disconnected. Replace relay is continuity is not specified. NOTE: DTCs are obtained by using DRB scan tool. For additional information, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE section.


http://www.2carpros.com/forum/automotive_pictures/62217_Relays_5.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_relays2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_specs_4.jpg


Merlin2021
Nov 28, 2009.


AD