Truck Maintenance Issue

[lryfer]

I am looknig at getting a used 2003 S10. The dealer that had it told me they are gonig to wholesale due to the following:

 

Transfer case was overfilled-when the truck run the vacuum actuator on the transfer case allowed tranny fluid to bypass into the heater vacuum lines thus ruining the heater controler on the dash and all the vacuum lines.

 

This make sence. I have asked several people around here and they were surprised on the explanation.

 

Does anyone know if this can happen or the dealer (NON CHEVY) didnt know what they were doing?

 

Suggestions comments.

 

Thanks

[wavery]

I am looknig at getting a used 2003 S10. The dealer that had it told me they are gonig to wholesale due to the following:

 

Transfer case was overfilled-when the truck run the vacuum actuator on the transfer case allowed tranny fluid to bypass into the heater vacuum lines thus ruining the heater controler on the dash and all the vacuum lines.

 

This make sence. I have asked several people around here and they were surprised on the explanation.

 

Does anyone know if this can happen or the dealer (NON CHEVY) didnt know what they were doing?

 

Suggestions comments.

 

Thanks

 

Not sure about the transfer case but this used to be a fairly common problem on turbo-hydro transmissions that had a vacuum modulator.

 

If the diaphragm in the vacuum modulator leaked, the engine would suck transmission fluid out of the trans and the vehicle would smoke like crazy. Quite often the owner would sell the vehicle because they thought that it had a blown piston or something.

 

Back in the early 80's, I bought a truck (off of a used car lot) that had that very issue. The U/C dealer thought that the truck had a blown engine. I bought a 5-year-old truck for $250.

 

It is very easy to diagnose. Just pull the vacuum line off of the modulator. If it has oil in it......... that's the problem.

 

It's fairly easy to get the oil out of the lines by spaying WD40 in the lines with the engine running. I don't know what else it would damage other than the spark plugs..... it usually fowls the plugs. Clean them or replace them.

 

BTW....... I question the "Over-filling" part. The module on the transfer case would have to be bad in order for the fluid to pass through the diaphragm.

 

He may want to wholesale it because the labor involved. This could be a time consuming repair. If it did do harm to the A/C control, it would need to be replaced also....... My guess is, the truck may have other problems also. Although those problems could be related to this one. Like if the transfer case isn't shifting... ......I'm not much good when it comes to FWD stuff.

[babydeuce]

While I highly doubt the transfer case was overfilled(you really have to work at it to overfill), this is a common problem with the S10. The transfer case vacuum switch will allow fluid into the vacuum lines. When this happens, the 4wd system will not engage, and it does get into the A/C controls. While not extremely expensive to repair/replace the parts, it is time consuming. If you have the time and tools, you could fix it.

 

http://www.zr2usa.com/mboard/index.php?showtopic=47579

 

I face the same problem on my son's 98 S10 Zr2

 

Jack

[streetperf]

I am looknig at getting a used 2003 S10. The dealer that had it told me they are gonig to wholesale due to the following:

 

Transfer case was overfilled-when the truck run the vacuum actuator on the transfer case allowed tranny fluid to bypass into the heater vacuum lines thus ruining the heater controler on the dash and all the vacuum lines.

 

This make sence. I have asked several people around here and they were surprised on the explanation.

 

Does anyone know if this can happen or the dealer (NON CHEVY) didnt know what they were doing?

 

Suggestions comments.

 

Thanks

 

Not sure about the transfer case but this used to be a fairly common problem on turbo-hydro transmissions that had a vacuum modulator.

 

If the diaphragm in the vacuum modulator leaked, the engine would suck transmission fluid out of the trans and the vehicle would smoke like crazy. Quite often the owner would sell the vehicle because they thought that it had a blown piston or something.

 

Back in the early 80's, I bought a truck (off of a used car lot) that had that very issue. The U/C dealer thought that the truck had a blown engine. I bought a 5-year-old truck for $250.

 

It is very easy to diagnose. Just pull the vacuum line off of the modulator. If it has oil in it......... that's the problem.

 

It's fairly easy to get the oil out of the lines by spaying WD40 in the lines with the engine running. I don't know what else it would damage other than the spark plugs..... it usually fowls the plugs. Clean them or replace them.

 

BTW....... I question the "Over-filling" part. The module on the transfer case would have to be bad in order for the fluid to pass through the diaphragm.

 

He may want to wholesale it because the labor involved. This could be a time consuming repair. If it did do harm to the A/C control, it would need to be replaced also....... My guess is, the truck may have other problems also. Although those problems could be related to this one. Like if the transfer case isn't shifting... ......I'm not much good when it comes to FWD stuff.

 

[02Trailblazer LS]

I have a 2002 Trailblazer LS and my service 4WD light came on and it doesn't allow me to go into 4wd, What could be the problem?