up's I think I found the problem!! waiting for another one to try.. tested voltage current and grounds so im pretty sure its it

 

what did you find that might be the problem?

 

I found the problem and I believe it'll be the same case with yours oldmantan. Go under by the blower fan. The connector plug to the fan, follow it to another plug witch is a resistor/relay believe it or not. This has a total of 3 screws then it pops down to remove. It's bit of a tight squeeze but doable with a short short Philips screw driver. But before removal you can test the other plug that's going into the relay (not the blower plug!) turn on your climate control and turn fan on any speed. With volt meter you should be getting power on the 2 bigger connections not the small one I think that's a signal wire? When you turn off the fan/climate control power will turn off. If this is getting power you need that relay!! *I used one off of a 93 Gs300! It's a different part number but plugs right in!! And it's a lot cheaper and easier and to find on eBay! BUT I have not mounted it yet I'm pretty sure it'll mount right on with swapping brackets.. I can post pics later or private message me your number I'll send pics or walk you through it.

 

It looks exactly like this one..

http://r.ebay.com/GcjlhB

 

Out of curiosity, did anyone run the HVAC diagnostics to see if there is a logged error code for the bad relay sc300PR is describing?

 

I have not looked at the part, I'll take a look at it today! Thanks! Let me know if it works! Plug it in and see

 

Yea i ran diagnostics got nothing

 

Went to the junk yard, couldn't find the part. Either gone or i can't find it, where us it located cz the wires in that car were torn up.

 

the gs300 blower control relay works.. . hasn't gave me any problems so far

 

wtf?? i dont think my car even has that? what year is yours??? i've never seen anything like that in that spot especially, i'm pretty sure in that spot i just have a little cover with butterfly nuts for the cabin filter. can you take a picture of it installed in there?

in that same spot my car has this i think, if it's the same spot



i think our cars are different, mines a 92 and yours is a 94 so they might have changed that then

 

Mine is a 95 sc400, no my car has that too. its on the left side of the fan closer to the center console.. in the picture is the one from the gs300** the original one is white so it blends in with everything! it is on the right side further back by the firewall behind the fan. or right above the abs computer! you can see it and take it out just by pulling the carpet back and the cover for the ecu to give you more clearance to remove part

 

ok i'll take a look at it tmr, i see the GS ones are only 30 bucks on ebay, so if i can't somehow rebuild or fix mine i'll buy it. but im still doubtful if its there lol. i can't believe ive never seen it.

 

I have the same problem with the heat not coming on even when the engine is up to operating level. Does anyone have the solution?