Heater/AC control panel

[RogueGeography]

The fan for my heater/AC in my 90 is not responding right to using the switch on the dash.



It seems like connections behind the face may not be touching right when I try to change between fan speeds. Sometimes the fan will blow, sometimes it won't, sometimes it blows at the wrong speed.

Have any of you had this problem and fixed it?

How do I get the heater module out of the dashboard?

 

[ev13wt]

Remove your glovebox. Remove the thingy from the air duct. This thigy has coils on it, which give different resistence. It's in the air duct so it can be cooled.

Each coil is a position on your switch. They will be burned out.

Pics and instructions inside:
https://www.4crawler.com/4x4/CheapTricks/Blower.shtml


Easy, fast and "feels great man" fix.

 

[RogueGeography]

This is great.

So is everything in roughly the same places in a first gen as a second gen? That guy talks about a first gen.

 

[ev13wt]

Hey, the guy has a website you really should read! Lots of awesome tips.

Yes, it should be at or around the same location. Pull it and see if any of the little coils are broken. You can also check for continuity with a battery, 2 wires and a light bulb. (or the proper tool)

ITs around 50 bucks at the dealer, so make sure it IS in fact broken. Might actually be the switch. (If the coils are broken, but sometimes they touch and it works, and sometimes they don't touch and it doesnt ... )

 

[RogueGeography]

Sweet. That helps a ton

 

[Voltan73]

I'm a 17 year parts guy for a Toyota dealer. Sounds like the blower (fan) switch, or the blower motor resistor. In my experience, the switch is the more common fail.
Keep in mind, electrical parts from a dealer are non-returnable if installed. Hope this helps...

 

[RogueGeography]

Would you say that the order to check the possible issues would be the ones listed on 4crawler that I quoted below?

For testing, if you touch the relay, you should be able to feel it click on and off as you move the fan swtich on and off. If it does, that likely means the relay is fine. Pull the fuse to inspect it. For other issues, the most common failure is the resistor pack, common issue is loss of all the lower speeds. Worn out motor brushes are also somewhat common, you may find the fan does not run or runs slower than normal or runs for a while then shuts off (due to overheating). The third most common problem is burned contacts on the fan switch itself. For this, you need to disassemble the dahs enough to gain access to the fan switch. The burning is usually visually evident, replacement is the likely fix.

 

[Voltan73]

I can't help as far as diag procedures; I'm going off of what I've sold over the years. The resistor was a common fail in the old Camrys, while I sold quite a few of the fan switches for the trucks and Runners.
I don't think I ever sold a blower motor for any of them.

 

[RogueGeography]

Thanks for the tips