Dual Climate Control Problem

[NeverSatisfied]

02 V8 Sport w/ 55k. First problem I have ever had with the car. Been stone reliable to date.

I searched and found a few that have had problems with the DCCV, but my problem is a little different

Thermostat appears to be operating correctly according to the dash gauge. Outside temperature has ranged anywhere from 30-60F. With the climate control set from 60-81F, the temp from the vents is ice-cold. The air blows progressively harder as you get close to 81. If you change the temperature to 82, the temperate changes to moderately hot and 83 is full-on hot. The same works as you reduce the temparature.

This was an instantaneous failure. both drivers and passenger act like this even when operated independent from on another. Any ideas. DCCV sticking? One post I found, the guy describes symptoms similar to mine and fixed it by replaceing the evaporator discharge temp sender

 

[97stscaddy]

Mine is also kind of sensitive around the 80° mark(interior temp) . Not as bad as what you described, but there does see to be a bigger swing in temp change between about 78 and 82°. Outside temp doesn't seem to matter on mine.

With your fan speed set to auto the fan will blow faster as you raise the temp setting. Once that temp is reached inside the car the fan will slow back down. I always just set the fan speed on one of the two lowest settings and leave it there.

 

[04SCTLS]

Make sure that your fluid level is full.
Mine was down almost a gallon before the car started to overheat.
I had my mechanic replace the DCCV since I already bought it (120.00 from rock auto).
After he put it in and filled up the coolant everything worked good.
Before I would get either cold at 60 or hat at 90 with no blending in
between.
But do check the fluid level first and top up if nessessary.

 

[NeverSatisfied]

That's exactly what I've done as a band-aid fix. On full auto that fan is blasting anywhere 75 and up. I manually override the fan speed to 1 or 2 and play with the temp from 80-81-82.

I with summer weather starting in March in SA, I may just limp along until it warms up, but I would like to fix the car. I was thinking I'd swap the evap outlet temp sensor with the passenger sensor and see what happens as they both sound easy to get to. According to a post I found, that helped the guy isolate his problem with the bad sensor.

I doubt it's the pass or driver heater core outlet as they would both have to fail simultaneously.

The sensor's are cheap and don't mind a shot in the dark, but I'd like to be positive I have a bad DCCV before I ante up.

 

[NeverSatisfied]

ran HVAC self test last night and no error codes, all 8's, any other ideas?

 

[SPSully]

odd.... i have recently found a different kind of issue. Mine adjusts the fan speed, but only blows one temp...HOT AS HELL!!!!!!!! hmmmmmmm

 

[joegr]

odd.... i have recently found a different kind of issue. Mine adjusts the fan speed, but only blows one temp...HOT AS HELL!!!!!!!! hmmmmmmm

Classic failed DCCV symptom.

 

[SPSully]

ughhhh... i figured as much. I'm curious what kind of complexity that job is. I have to do my clock spring and it.... maybe do my window regulators while im inside and dealing with electrical crap

 

[scjmc]

I had a DCCV failure where I was getting hot air on the PASS side, and cool air on the driver's (with AC ON). DCCV Fixed that, but the problem returned about a year later (about 10 degrees warmer on pass side). Naturally I replaced the DCCV again. Made no differance--I bought a used climate controll (the whole dash thing) from ebay for $25. Fixed my problems.

 

[04SCTLS]

I have an extra climate control for the 03-06 heated cooled seats.