Problems with heater on a '91 GMC Sonoma 4.3L V6
Question:
Are you losing coolant? Sounds like it might be a bad heater core… – Hide quoted text — Show quoted text – > Hi, I got a 1991 GMC Sonoma with a 4.3L V6, 4X4 model, Ext Cab… Now, on > kinda colder summer nights (especially nights while it’s raining) if I turn > on the heater, but, especially the defroster, it blows steam out… Then, > that kinda ends up makin’ it get COMPLETELY fogged right up inside the > vehicle, almost impossible to see through, and they won’t defog… It’s > really wierd that the defroster would just blow out steam like that… I > haven’t been able to find the source of it, and if anyone’s seen that > problem before, or know how to fix it without spending a whole helluva lot > at a fix-it shop, any help would be much appreciated… Thanks in advance > Struggling to see, > Brent > — > "THROW YOUR SPARE CHANGE AT ME!"
Response:
Make sure the HVAC drain isn’t blocked. If water is accumulating in the heater unit – that might cause this. – Hide quoted text — Show quoted text ->Hi, I got a 1991 GMC Sonoma with a 4.3L V6, 4X4 model, Ext Cab… Now, on >kinda colder summer nights (especially nights while it’s raining) if I turn >on the heater, but, especially the defroster, it blows steam out… Then, >that kinda ends up makin’ it get COMPLETELY fogged right up inside the >vehicle, almost impossible to see through, and they won’t defog… It’s >really wierd that the defroster would just blow out steam like that… I >haven’t been able to find the source of it, and if anyone’s seen that >problem before, or know how to fix it without spending a whole helluva lot >at a fix-it shop, any help would be much appreciated… Thanks in advance >Struggling to see, >Brent >– >"THROW YOUR SPARE CHANGE AT ME!"
Response:
No, the coolant is perfectly fine… I’lll check the HVAC today… Thanks for the tip
– Hide quoted text — Show quoted text -> Make sure the HVAC drain isn’t blocked. If water is accumulating in > the heater unit – that might cause this. >Hi, I got a 1991 GMC Sonoma with a 4.3L V6, 4X4 model, Ext Cab… Now, on >kinda colder summer nights (especially nights while it’s raining) if I turn >on the heater, but, especially the defroster, it blows steam out… Then, >that kinda ends up makin’ it get COMPLETELY fogged right up inside the >vehicle, almost impossible to see through, and they won’t defog… It’s >really wierd that the defroster would just blow out steam like that… I >haven’t been able to find the source of it, and if anyone’s seen that >problem before, or know how to fix it without spending a whole helluva lot >at a fix-it shop, any help would be much appreciated… Thanks in advance >Struggling to see, >Brent >– >"THROW YOUR SPARE CHANGE AT ME!"
Response:
Hi, I got a 1991 GMC Sonoma with a 4.3L V6, 4X4 model, Ext Cab… Now, on kinda colder summer nights (especially nights while it’s raining) if I turn on the heater, but, especially the defroster, it blows steam out… Then, that kinda ends up makin’ it get COMPLETELY fogged right up inside the vehicle, almost impossible to see through, and they won’t defog… It’s really wierd that the defroster would just blow out steam like that… I haven’t been able to find the source of it, and if anyone’s seen that problem before, or know how to fix it without spending a whole helluva lot at a fix-it shop, any help would be much appreciated… Thanks in advance Struggling to see, Brent — "THROW YOUR SPARE CHANGE AT ME!"
