I recently bought my 98 Blazer LT in May with 94500 miles on it. Thank god I bought the warranty they offered because my suv has been in the shop more times that I can drive it. I now can't drive it again because the tranny torque converter is going. The biggest problems however are not covered under my warranty. There is no heat in the suv(aside from the seats) and no matter where I put the control, air still comes out of the dash, defroster and the floor. Had the coolant flushed out, the thermostat replaced, intake manifold gasket replaced because it was leaking and smoking, but was told that the cause could be the heater core plugged or a temperature control assembly is bad. The second one is a almost $500 part. Does anyone have any good advice on how to go about finding out for sure without costing me my arms in labor? Second problem is now my abs system is going bad. The suv will stop but then seems to give a little and let the suv move forward, not all the time but enough to scare the crap out of me in the snow. Any clue? I absolutly love the truck and still owe on it so theres no hope of selling anytime soon. Just need some help to get me through another Pittsburgh winter. Thanks

 

Have you driven a vehicle with ABS brakes before? Here is a short description of how ABS operates.
The EBCM monitors the speed of each wheel. If any wheel approaches lockup, the EBCM controls the solenoids (isolation solenoid and dump solenoid) in order to reduce brake pressure to the wheel approaching lockup. Once the wheel regains traction, brake pressure is increased until the wheel again approaches lockup. This cycle repeats until either the vehicle comes to a stop, the brake is released, or the wheel is no longer approaching lockup.
In other words, it's really jerky when it's working and it only works when the vhehicle wheels are slipping.

For you heating problem: do you just have cold air coming out?
Feel the heater hoses when the engine is warm. Both hoses should feel the same temperature. If one hose is hot and the other is cold, then you have a plugged heater core. Often a heater core can be flushed out and heat is restored.

Let us know what you find and hopefully we can help you work out these problems.

 

For the heat, if none of the modes work, I would suspect a problem with the vacuum supply from the engine. This is a typical problem. With the mode doors in their neutral position, you won't get heat and your modes will be all screwed up. I would pull the control head and see if there is vacuum at the source port. Run a search on HVAC vacuum and you should come across some threads showing the diagrams for both the manual HVAC headunit as well as the automatic HVAC headunit.

 

Well as far as the brakes are concerned, it's affecting the stopping of the vehicle, not just in the snow but in every day driving. I am having it looked at and was told the abs is acting up. There is only cold air blowing out of the vehicle so once I get it back I will check the hoses. Thanks for the advice