Chevy 2001 4.3 blazer hose melt

[racerdad2007]

I have a 2000 Chev. S-10 Blazer 4.3 that just had lower intake gaskets replaced and now, when the a/c is turned on, air goes hot to cold to hot, not warm, repeatedly. It has climate control and the compressor is staying on, not cycling. A/C was working perfectly before gaskets were replaced. HELP PLEASE!!!!!

[ProTech]

You might want to look and make sure everything is plugged in, especially on the back of the compressor. It would have had to been moved during the intake job so probably has something to do with that. There are two connectors on the back, one to power it up and another for the pressure sensor (if equipped). Or possibly one of the harnesses got pinched. If the A/C is running constantly, you're probably freezing up the evaporator core which would then blow hot air until it defrosted enough to blow cold again, over and over. Give a check over the area that the work was done, you'll probably find the problem in that area.

[roy33]

I own a 2001 Chevy blazer, 4.3 liter engine. The diagram I will attach will show the failure part but none seem available. I'm sure you have seen this before. Now the wiring harness has melted half way thru. Thanks for any suggestion on how to fix this.

[carriedi]

first thing is to replace the part numbered #9 in your diagram. that should be a one way check valve. When that valve goes bad it allows hot exhaust gases back into the rubber tube and that's why the rubber parts gets burned up over time.

because the parts are over 15 years now, it could be problematic to find the exact parts you need. Check with ACdelco online cataloging to see if you can find the correct parts you need. You may not be able to buy the parts that you need individually. It may come on a set of parts.

[Guest]

Thanks for the answer. Ordered the part today.

[EMEDIO]

I have a 2004 blazer ls sometime I get good heat other times it's warm or cold air . Normal operating temp has always been just below 210 degrees now it increases to just over 210 then after a short while it goes back to normal

[carriedi]

first thing to do is check your coolant level. If the coolant gets low in the system you may not get flow through the heater core.

next time the heat is not coming out hot, check the two hoses that go to the heater core. see if one is hot and one is not so hot. You could have a heater core that is starting to plug up.