1998 Dodge Caravan AC wont turn on

VMACKELL

MEMBER
1998 DODGE CARAVAN
6 CYL
2WD
AUTOMATIC
259,000 MILES

The AC will work if I activate the ac relay ( I usualy wrap a rubber band around the relay when its really hot ) but will not turn on when I activate the switch, although the light comes on and the blower runs. I've checked all thre fuses and replaced the relay, Thinking maybe a PCM or ac heater control module, or something in between?

3 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Battery been replaced recently? If so try this.
Shop: WALES GARAGE GOODYEAR
Date: 7/18/2008 5:58:23 AM

When Battery replaced you must recal the a/c body module or rear wiper system lights will flash and a/c will not cool the van properly. You will find the procedures in the a/c section of the test and diagnostics.

The prcedure is simple.

1 Key off (note a/c can not have been on or system will not Calibrate) the evap must be warm!

2 Set Blower to High.

3 Set mode door switch to panel( Big arrow pointing to main dash outlets)

4 Set temp to COLD (slider switch)

5 Push rear wiper and wash buttons at same time turn on the ignition to run, hold till (DO NOT START)

6 All LEDS LIGHT UP for 5 Secounds System is now in test mode! Release the butons

7. When system is finished runing test it will START flashing the the rear wiper led only.

8 Start and run a/c system to check functions of blend doors and defrost systems!

9 After the test clear your nose and throat to remove any airborne spores you just sucked in!

10 NEXT JOB BOSS!