S10 heater

S

Swats

Forum Member
Now that it is getting really cold out I need to fix the heat in my 1995 S10. I think I might have more then one problem. First problem the blower motor only comes on intermitally. If I hit a bump in the road it might turn on or off. Second problem is that I am not sure if the control that switches from defrost to floor heat etc. is working. I don't know if that is related to the blower issue. Any ideas? Thanks.
 
do anyof the speeds work? the high relay is known to melt. its on the fire wall right next to the heaterbox under the hood. should be the relay farthest to the right i believe. unplug it and look inside.
 
you can pull the resister out and look at it. i have saw a few with the relay issue and bad resister. does the motor work if you jump power to it?
Also do you have the common fan switch issue where the detent is gone and you can rotate it almost all the way around?
 
I was going to sort the heat issue out today, but some things came up. But I do know that the dial does not turn all the way around.
 
Ok I had a little time today to look at it. I pulled the relay apart and it is clean inside. I then pulled the resistor. I could not get the assembly out all the way because there is an end of a bolt that stick out from the firewall that is in the way. But what I could see looked clean. I then went inside the truck. I started the truck up. I then turned on the heat. At this time the blower was working. So I cycled through the different fan speeds a few times. They seemed to be fine. With the blower running on high I then cycled through defrost, blend, heat etc. While I was there I put my hand over each vent to see where the air was coming from. That checks out to be correct. Now over the last few weeks when I am driving to work, the blower might turn off, then a few minutes later it would come back on. That seems to be my issue.
 
Swats said:
Ok I had a little time today to look at it. I pulled the relay apart and it is clean inside. I then pulled the resistor. I could not get the assembly out all the way because there is an end of a bolt that stick out from the firewall that is in the way. But what I could see looked clean. I then went inside the truck. I started the truck up. I then turned on the heat. At this time the blower was working. So I cycled through the different fan speeds a few times. They seemed to be fine. With the blower running on high I then cycled through defrost, blend, heat etc. While I was there I put my hand over each vent to see where the air was coming from. That checks out to be correct. Now over the last few weeks when I am driving to work, the blower might turn off, then a few minutes later it would come back on. That seems to be my issue.
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check the connector on the motor. I have seen them melt more then once. Doesn't hurt to check the balast resistor connector either. Those tend to melt down to. But with it being intermitent at all speeds. I'd check the supply fuse in the Power Distrobution box and the motor connector.

Also if the motor has been replace See if the splices they used are loose.
 
I just went out and checked again. This time the blower did not come on. With the dial in the high position I popped the hood and the blower came on. Then it shut off a few second later. I checked the connection at the motor, resistor, and relay. The connections are fine. What I am thinking is replacing the resistor and relay sense they are pretty cheap and relatively easy to get to. From when I checked it earlier today the was not much difference in speed between the lower settings.
 
ive never changed one in a s10. mine says cut here for service on the box. never looked into that though
 
sounds like a loose connection or an open somewhere in the circuit under the hood. since when u open and closed the hood it changed. Just because the connections looked ok doesnt mean they are contacting good. Pull the connector off and with a small pick bend the tangs a little to get a better bite when u plug it in
 
I finally had some time to look at my truck again. I went through and checked the wiring connections at the blower motor, relay, and resistor. The connections are clean. So I then started the truck and turned the heat and blower on. This time the blower was working fine. I then ran it through all the different speeds and settings. Then I popped the hood and started pulling on connections and tapping on the motor, relay, and resistor. The motor did not turn off. I even went and shook the whole truck, the blower did not turn off. I then shut the truck off and closed the hood. I put my tools away, but before heading back inside, I decided to try it one more time. This time the blower would not run. Once again checked the connections and tapping again. The blower would not come on. Finally I went looking for my volt meter (which has been missing for awhile). With the truck running and the blower set on high I get 14.5 volts across the two wires for the motor. I then switched the blower to the next lowest setting and checked the voltage at the motor again, 14.5 volts again. I went and checked the last two settings as well each gave 14.5 volts. Now I would think with the resistor, the voltage should drop at the blower motor? I plugged the blower back in it did not come on. Any ideas?
 
Swats said:
I finally had some time to look at my truck again. I went through and checked the wiring connections at the blower motor, relay, and resistor. The connections are clean. So I then started the truck and turned the heat and blower on. This time the blower was working fine. I then ran it through all the different speeds and settings. Then I popped the hood and started pulling on connections and tapping on the motor, relay, and resistor. The motor did not turn off. I even went and shook the whole truck, the blower did not turn off. I then shut the truck off and closed the hood. I put my tools away, but before heading back inside, I decided to try it one more time. This time the blower would not run. Once again checked the connections and tapping again. The blower would not come on. Finally I went looking for my volt meter (which has been missing for awhile). With the truck running and the blower set on high I get 14.5 volts across the two wires for the motor. I then switched the blower to the next lowest setting and checked the voltage at the motor again, 14.5 volts again. I went and checked the last two settings as well each gave 14.5 volts. Now I would think with the resistor, the voltage should drop at the blower motor? I plugged the blower back in it did not come on. Any ideas?
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with no load, it will read charging system voltage


replace the blower motor
 
Well after looking at the wiring diagram, and consulting my brother (he works for Bosch) it looks like a bad blower motor. The might be a dead spot on it, or a short in the windings somewhere. Anyhow I got the blower motor out, hopefully I can get a new one tomorrow. My newest question is, how does some one with normal sized hands get the motor out and back in? I have a fairly small hands and it was a pain in the butt to get the bottom screws out.
 
Swats said:
Well after looking at the wiring diagram, and consulting my brother (he works for Bosch) it looks like a bad blower motor. The might be a dead spot on it, or a short in the windings somewhere. Anyhow I got the blower motor out, hopefully I can get a new one tomorrow. My newest question is, how does some one with normal sized hands get the motor out and back in? I have a fairly small hands and it was a pain in the butt to get the bottom screws out.
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if needed, you take the bolts out of the rear of the wheel well and lower it down, gives you more room
 
Well got a blower motor this afternoon and it took me about an hour to get it in. Probably a good 30 minutes trying to find just the right way to get the motor into the heater box. I put everything else back together and took the truck for a ten minute drive. The blower seemed to work fine. I guess I will really find out tomorrow.
 
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