Chrysler Rear A/C System Connections
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Service Slants Chrysler Air conditioning system blows Chrysler Rear A/C warm air. Owners of 2006-07 Town System Connections & Country, Caravan and Voyager minivans with the rear air condition- Expansion Nut ing system may come into your shop Valve with a comment that their a/c system doesn’t get cool enough or blows nothing but warm air. One likely cause of the cooling is- sue, reports Chrysler, is a low refrig- erant charge. Leaks in the rear a/c evaporator are what cause the loss of refrigerant. Installing an improved evaporator from a special kit (Part No. CNTKX210AA) should bring back the cool in no time flat. The kit includes the upgraded evaporator, a rear expansion valve, two O-rings, a nut and three seals. Magazine Before going down to the dealer to order the new kit, however, get the Sealing OTOR people-mover on a lift. Get under- Plate neath the vehicle and, using the illus- Extension tration at right for reference, careful- Tubes ly inspect the rear extension tubes. M Illustration: Chrysler says they’re prone to corro- Although the rear evaporator should be a prime suspect when you have re- sion or pinhole leaks. If the tubes are frigerant leakage on a 2006-07 Chrysler minivan, don’t overlook these exten- damaged, you’ll have to replace them sion tubes. They’re susceptible to corrosion and pinhole leaks. (Part No. 5183256AA) along with the rear evaporator to get the desired fix. Ford with the 3.7L engine and 42RLE au- DTC stored hard, won’t clear from tomatic may come into your shop GM memory. Some 2006 Ford Fusions, with a complaint that the transmis- Squealing noise on start-up, pos- Lincoln Zephyrs and Mercury Milans, sion won’t shift out of 2nd gear after sible engine vibration. Some 2007- as well as 4.6L V8 Mustangs, may turn an engine start. With a little prod- 10 GM cars and light trucks with the on the MIL and store DTC P1000 ding, he might admit that the prob- 3.5 or 3.9L engine may develop a (System Readiness Status Incomplete) lem is intermittent, with the trans- squealing noise on start-up. GM says in computer memory in high-altitude mission behaving fine on the next key the noise is often accompanied by an conditions. Ford says that if there are cycle. The MIL will be off and no obvious engine vibration and is likely no other codes stored and clearing the DTCs stored when either scenario due to the outer ring of the crank- P1000 proves impossible, you’re deal- presents itself. shaft balancer slipping on the center ing with software gremlins in the PCM. One likely reason for the finicky hub. New-design crank balancers are Reprogramming the module is the only tranny, says Dodge, is the PCM at now available to address the issues. sure-fire remedy. You’ll find the new times incorrectly determining that Check with a dealer for the part calibration files in WDS release B40.4 certain operating parameters aren’t number for your specific application. and higher or B41.1 and higher. If you being met following an engine start. Vehicles that are prone to the con- have a subscription, you can also down- That forces the transmission into dition are 2007 Buick Rendezvous load the new software off the internet “limp-in” mode, which causes the 2nd and Chevy Monte Carlos, 2007-08 at www.motorcraft.com. gear lock situation. On the next Buick Terrazas, 2007-09 Chevy Up- restart, the module reverses itself, al- landers and Pontiac Montana SV6s, Dodge Truck lowing the transmission to shift nor- 2007-10 Chevy Malibus and Pontiac Transmission stuck in gear. The mally. Software gremlins in the PCM G6s and 2007-11 Chevy Impalas. owner of a 2007-09 Dakota pickup are the cause of all the trouble. Repro- 58 September 2013 Tom Rosario gramming the module with updated fuel, the PCM will sense the rich And it’s this lean condition coupled software is the only sure-fire remedy. condition, then try to compensate for with the closing of the purge valve To do the flash, you’ll need a wiTECH it by driving the fuel system lean. that causes the driveability issues. diagnostic platform operating at soft- continued on page 60 ware release 10.01 or higher. Chrysler Driveability and a/c problems. Budget Owners of 2001 Town & Country, Friendly! Caravan and Voyager minivans built before 1/8/01 may complain of a host of driveability and a/c system con- cerns. Among the complaints: re- duced engine power when the a/c system is switched off, with the pow- er returning after the throttle is snapped wide open or the engine is restarted; a serpentine belt chirp fol- lowing a wide-open throttle 1-2 shift; a short, one-time spark knock after a warm-engine restart; or an a/c com- pressor that burns up if the front sys- tem is continually operated with the rear system off. Chrysler attributes all of these problems to software issues in the PCM. Flashing the module with up- dated software is the only remedy. You’ll find the new calibration in CIS ™ CD2077 or higher. OPTIMAXOPTIMAX 400400 GM Truck Leak Detection Flashlight Hesitation, stumble or stall, harsh This new, economical inspection flashlight features a high-output or slipping 1-2 shift. Drivers of true UV LED that causes dyes to fluoresce far more brilliantly and with 2002 Chevy TrailBlazers, GMC En- greater contrast compared to conventional inspection lamps. It makes voys or Olds Bravadas with the 4.2L all automotive leaks easier to spot, slashes diagnostic time and puts (VIN S) engine may complain of an money where it belongs — in your wallet! intermittent hesitation on accelera- tion or a stumble or stall on throttle Power comparable to high-intensity 150-watt lamps! tip-in after the vehicle has been Inspection range of up to 25 feet (7.6 m) or more! restarted following a prolonged soak. Works with all universal/ester and PAG A/C dyes, as well as Furthermore, owners of 2003 models green-colored fluid dyes of these trucks may also complain of a Compact design easily gets into tight, cramped areas harsh or slipping 1-2 shift or a hard Rugged, corrosion-resistant anodized lamp body stands bump as 2nd gear kicks in. up to years of heavy use According to GM, all of these 100,000-hour LED service life symptoms could be due to the OBD II system’s automated evap self-test. The OPTIMAX™ 400 (P/N TP-8610CS) comes complete with a lanyard, belt holster, three “AAA” batteries and fluorescence-enhancing glasses. Keep in mind that during this test, the PCM opens the purge valve for a Circle #27 few seconds then closes it, to verify To learn more, scan QR code the integrity of various sensors. Prob- call 1-800-641-1133 lem is, if the canister is saturated with or visit www.tracerline.com September 2013 59 Service Slants GM says the problems are much ware is the only sure-fire fix. To do before long you’ve got a wicked bear- more obvious when the ambient tem- the reprogramming job you’ll need a ing knock on your hands. perature is higher than 70°F and on StarSCAN scanner operating at soft- The key is to catch the leak early vehicles that experience short trips, ware release 7.04_SP1 or higher. The on, before it can do its dastardly since they don’t have the advantage actual calibration files are available deed. But how do you find a pump of a complete drive cycle that would off the internet. leak when it’s buried under the tim- allow the purge canister to fully recir- ing cover? Just look at the left side of culate the excess fuel vapors. Toyota the engine block just below the ther- Reprogramming the PCM with up- Accelerated brake pad wear. Toy- mostat housing. That’s where the dated software is the only sure-fire ota says that the front brake pads on pump leak will first manifest itself. remedy. You’ll find the new calibra- 2009-10 Corolla models may wear Forewarned is forearmed! tion on the TIS 2003 Disc 10.0 CD. out much quicker than expected. One likely reason, reports the Japanese Acura Honda carmaker, is that the friction material MIL illuminated, misfire codes Squeak from underneath vehicle. used in the OE pads can’t pass logged. Some 2001-03 TLs (except Some 2007-11 CR-V crossover mod- muster with regard to the hard sur- Type S models) may turn on the MIL els may produce an annoying squeak face of the rotors. Installing updated, and log misfire DTCs P0301 and from underneath the vehicle. Accord- more aggressive pads with a different P0305 in computer memory. Acura ing to Honda, the noise is most evi- friction formula (Part No. 04465- attributes the problem to the PCM dent when the steering wheel is 12630), along with a new set of anti- misinterpreting key sensor inputs turned lock-to-lock at slow speeds, squeal shims, should eliminate fur- during specific driving conditions. the air conditioning system is on or ther wear issues. New modules are now available to the engine is under some sort of load. address the concern. The front exhaust gasket sticking to Buick Before removing the old computer, the inlet flange of the catalytic con- Noise or vibration from brake, ac- however, look at the freeze frame data verter is the likely cause of the celerator pedals.