Good morning, I have a problem with my k5 blazer, when I drive about 15-20 minutes and the engine is warming up, when I stop at the traffic lights, I find it more and more difficult to get out in first gear, let me explain ... when I am driving 30 minutes, I stop at the traffic lights, and when I go out in first gear releasing the clutch, it bucks more and more, as if it did not get the point, but it does not manage to stall, when it is cold it goes wonderfully, it is just when it warms up and when going out in first gear ... and every time it bucks more and more, the clutch and its parts are new, from 6 months ago ... what could it be?

 

You might want to look at the pressure plate and/or fly wheel. Sounds like they got over heated sometime in the past and are warped a bit. While you have the clutch out, check the springs on the clutch packs.

 

For me it's a bit difficult to understand the issue.

By "bucking" you mean shaking as if the clutch is engaging and disengaging ryhtmically as AJBert suggests a warped pressure plate can do.
You are not talking about the engine not accelerating the Blazer once the clutch is fully released (engaged).

If cold it may run on higher idle and thus it is less pronounced.

In the past we have found similar issues with clutches that were not properly adjusted.
Similar issues also can be found if the assembly is done incorrectly and the clutch never fully engages and slips. (= heat an warping)
Also check that the hydraulic line is correctly bled from air.

 

^^^^ Good point! I was assuming the clutch was installed correctly.

 

I got a screaming deal on my K5 years ago because the guy I bought it from put the clutch disc in backwards and gave up trying to figure out why it wouldn't work.

 

Thanks for your answers, I told the mechanic who regulates the clutch and that the clutch pedal put it lower (it was very high) then they saw that the cable was poorly regulated, which is what made it tighten when warming up ...