blower motor relay replacement?

Hi,

If the new part has heavier gauge copper wires, it's like having extra money in the bank. It is actually less likely to melt down.

I like the idea of the heat shrink. That is a great idea and I strongly recommend it.

If you are using butt connectors to join the two wires together, make sure the wires are secure in the connector before installing the heat shrink.

Now, if you look below, I attached the wiring schematic for the blower motor. I would recommend checking the HVAC fuse under the hood first. If that is good, then check the HVAC fuse 9 in the vehicle. Note: The fuse under the hood will have power at all times and the interior one only has power when the key is in the run position. Confirm they are good and let me know the results. If they are, we can continue the diagnostic process.

Let me know if that helps or if you have other questions.

Take care,

Joe

See pic below. I highlighted or circled where the most likely problem would be.

Thanks, this helps all the info you pasted on to me. Will update how i get things done on this issue which is driving me crazy. I how this solves the problem. A lot of money and time spent on this issue....

Joe,

No problem whatsoever. Let me know if I can help in any way.

Take care,

Joe

Okay, installed the new blower motor relay, new bm was installed 2 months ago with the new resister, all fuses are ok, started the blazer, turn on the HVAC to A/C, works, but ,but .... still getting very little air to the top vents for the a/c... My son the Mechanic all along has been telling me that it's a leak somewhere in the heater box, and he wants both of us to remove the dash again, only one hour for both of us to do it. I still say its a door that wont open to let the air blow freely to the vents,and i always try the easy short cuts first,then hit the major headache. I have a camera endoscope and was going to check all possible ways and means to see if the door(s) are not opening . I know the one in the glove box is working, but i believe there is a another one or two in the box.Im the old school stret mechanic and have to find why or how come its broke and my son knows this but he likes to use his smarts on me ,just to break um. So, im open for this last conclusion on your answers and i hope drop down the dask isnt the last, but i believe it will be to end this issue. Any thoughts?

Joe,

Is it only the vents that have little pressure? In other words, does the defrost or floor heater work normally? Also, if there is a leak in the box, I would think you would feel the leak from under the dash.

Let me know.
Joe

yes ,only the vents and defrost and floor have very little air blowing, your call.

I think it needs to come out. Something is likely either broken at the blend door or has come apart. I wish I had an easier answer. If you can't see anything, the only thing I can think of is to take it further apart. If your luck is like mine, you'll find a mouse nest or something. LOL

Let me know if your son is helping or if there is anything I can do.

Joe

will give it a try on this issue.

well, update, son says he will pull the dask ouy (ihr) for him and will prove his point. Will keep you posted on it. Will do it tomorrow. Oh boy, he is going to nail me on this one. Maybe he is right and he's doing all the work. He is fast doing things and loves thinking and working on cars and trucks 7 days a week, no stop for him.

Thanks or the update. Hopefully, it will be easy for him.

Let me know.

Joe

pk, update. to make hinm happy anfd proove his point, we pull the dash and only found a hole here and there, like somebody before drill a hole in 2 spots . Tape then up and checked all the doors to make sure they work, and they do. Ha ha .. got my son this time,all doors are working. Now we pulled the resistor. looked inside ,all clean, which i did back in 11/23 when i installed it and checked the condenser, ,sll clesn snd shinning like glass. Well, after a 6 hr. checking, this and that ,he decides that even the air is coming out a "little " better then before ,when he use it. So, notw afyer checking the blower mower ,its ok , but he belives the motor isnt blowing hard enought. Well, we will see,after i put all the rest of the dash back tomorrow. I also believe him, after checking all the doors, checking the vacuum lines,rseister, etc, he may be right, wiil see. I hope he is ,and this blower was the problem all along, what do you think?? Im sorry to take up you time on this ,be this has been a night mare on my end ,and i hioe to end it soon, tks for all the answers so far.,god bless you for following me on all this crap.....

LOL Thanks for the update. Let me know what he finds. I'm interested in knowing.

Take care,

Joe

okay, as of today no inprovement with the quality of the vent air. re-checked and checked all the vacuum lines ,resistor,relay and even drill a hole in the condensor box snd looked inside to see if snything was blocking the condensor,nothing. Clean ,shinnie , no dirt ,nothing. Even checked the amps and voltage all are okay from the conector to the resister and blower motor. Man this is a driving you to drink issue. So me and my son are both tied on this one and will take a break and sit this one out and wait a couple of dsys and figure it out. Sometimes its better to let thing s along and come back and sometine in your mind give you a better answe. Will see. and now tome for s cold beer or two.Your call ..

Hi,

When you had it out, did the mode door move easily with no restriction? Is there anything that could be preventing it from moving properly?

Joe

Everything opened and closed as usual, all vacuums did what it was supposed to do when using the HVAC switch to switch over to all motions. Since the other blazer (2000) has a better blower, i guess this bogs my mind. Use this morning and everything works, but the poor blowing of the air drives me crazy, but at least its cold. I'M my mind and body a rest for a couple of days and and maybe something will come about. Oh, the best is after i put the blower motoe back, put the overflow tank back in and put the ECM on top of it and bolted sverything back, even clean the tank, put anti-freeze in it and started the blazer, bingo, the tank now has a leak somewhere on the bottom. Itsnt this crazy. W ell, what else is new, after 22 yrs. i guess its time for a new one. Amazing . One thing after another. will be shopping around or try to fix this one. thanks so far for keeping me with this issues and i bet this is driving you crazy too. Have a nice weekend,and god bless. Will keep you updated on all this issues,

Well, back again, was thinking, I'm going to replace the HVAC. Blower switch. This has to be a last and final result. Will pick it up tomorrow and see what happens. Everything has been replaced and just to clear my mind. Thanks again for your info, it helped and will see if this is the problem after all.

Hi,

Anything is possible. I hope it resolves the issue. By the way, if I was of any help, you are very welcome. I feel somewhat defeated. LOL

Let me know.

Joe