Blower/Heater circuit breaker tripping

[Spike Strip]

No, CB is dealer only, but cheap ~ $20 bux or so.

I've got a couple of perfect cond used ones - I'll send you one with the motor - IF I can find where they're stashed!

 

[wngrog]

So if my truck does not idle up when the a/c compressor kicks on, is that an adjustment I can make with the blue knob on the circuit board?

 

[Spike Strip]

So if my truck does not idle up when the a/c compressor kicks on, is that an adjustment I can make with the blue knob on the circuit board?

You should prolly start another thread on this, but the AC idle up is different from the amplifier board. Board controls the rate of compressor cycling and when it kicks in. I suppose if the board is bad, then the comp would never kick in - I'm really not that versed in how the whole thing works together --

However, if the RPMs do not increase when you turn on the AC, you need to check if actuator on the carb and valve are working, then go from there depending on results.

 

[wngrog]

I just put a "new" board in mine.

Thought maybe that's where adjustment was. I'm good at turning knobs but beyond that I err to the side of "take this to a pro"

Mine just started backfiring and stuff. I think I'm out of adjustment.

I'll look over all the vacuum hoses.

It's desmoged

 

[Spike Strip]

The idle-up circuit is not part of the emissions system. The hoses in the above diagram should not have been removed.

Post some pix of the engine compartment, if you can.

 

[87CRUSR]

I had the same circuit beaker tripping. Took it to local shop. The blower was pulling 40A at Hi setting. With 90 degree temps...ac is vital so I bit the bullet. Aftermarket blower was ordered and installed. I was thankful that new aftermarket is still available. The question is....for how long??

 

[CMD82]

I have the same issues if the blower is used on setting 3 or 4 with the AC on only, heat is fine. I will be interested in hearing a resolution, if any.

 

[Spook50]

Best bet is it's a heavily worn motor. Complete cleaning of the commutator (to include getting all the packed gunk out of all the skinny little gaps) and a new pair of brushes will correct it. Only potential issue is if the commutator itself (the segmented copper ring, which rides on a phenolic shaft) is too worn it may not last much longer. There's a way to fix it, but it's a big pain. Though with OEM no longer being available and the only replacement I can find being a Four Seasons brand (which I think is Chinese) on Rockauto, doing the in depth work to repair the commutator might be worth it if you have the time and patience.

 

[87CRUSR]

with OEM no longer being available and the only replacement I can find being a Four Seasons brand (which I think is Chinese) on Rockauto, doing the in depth work to repair the commutator might be worth it if you have the time and patience.

Four seasons brand is the new blower in my rig. I am keeping the old unit just in case it is repairable.

 

[wngrog]

The idle-up circuit is not part of the emissions system. The hoses in the above diagram should not have been removed.

Post some pix of the engine compartment, if you can.

Everything is there. I traced it all and found the wires going to the firewall and compressor. All vacuum lines attached.

I'll take it to a higher authority when the blower motor comes in.

Thanks for that again !

 

[CMD82]

Napa has this unit for ~$60, I am not familiar with Balkamp brand, nor can I locate where it is manufactured. I may purchase it and give it a try, I need those extra settings. Anyone have any experience with this unit or Balkamp in general?
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx?R=BK_6551614_0365962797

 

[wngrog]

It's not like this Chinese part is going to leave you stranded. I'd risk it.

Mine is now blowing the a/c fuse.

I've got a short somewhere. I hope it is not in the compressor. That's expensive.

 

[CMD82]

That's pretty much my thoughts on it as well, especially since there is no core required.

FWIW - I purchased a new compressor through Coolstream a couple years ago and it was pretty reasonably priced if I remember correctly.

 

[Spook50]

It's not like this Chinese part is going to leave you stranded. I'd risk it.

Mine is now blowing the a/c fuse.

I've got a short somewhere. I hope it is not in the compressor. That's expensive.

Honestly you might just have gunk built up in the clutch & coil assembly of the compressor pulley. Granted it'd still be a PITA to take care of because you're still stuck having to open up your system and remove/reinstall the compressor, but at least cleaning it all out won't cost you any more than the cost of having the system evacuated and charged.

Do you have the FSM? It'll tell you what to check to troubleshoot a blowing fuse. IIRC the A/C amplifier itself can sometimes be the culprit too.

 

[wngrog]

I changed the AC amplifier already.

Parts going in next are a new blower (that won't fix AC fuse though) and new breakers.

I also got a new vacuum piece to see if I can get idle to kick
Up

I'm suspecting the clutch in the compressor is dragging or something causing the AC fuse to trip

 

[CMD82]

I picked up the blower today from Napa - it says its made in Canada; it will require cutting and splicing the connector off the OEM unit. Standby for the install.

 

[wngrog]

Update.

@Spike Strip is the man. Thanks for the blower. The one I removed was really crusty. Glad to have a shiny new one. I installed it in 15 minutes and replaced both 30a breakers. Problem solved.

I don't think it blows harder. Just normal

 

[Spike Strip]

Glad it worked for ya! Cheers.

 

[87CRUSR]

Updates? Breakers holding fine?

 

[wngrog]

I replaced the blower motor. Put new OEM breakers in. All good.