No heat any ideas?


Asked by Sep 21, 2015 at 11:15 PM about the 1995 GMC Sierra 1500

Question type: Maintenance & Repair

Ive got a 95 gmc 1500. I recently
replaced the heater core along with
the hose from the core to the water
pump and hose assembly to the
block. I have no heat and my fan will
blow light at time then others itll
sound like its blowing really hard. My
truck has now heater control valve
and the blend door is activating so the
actuator and door a working
fine..sound like the blower motor

7 Answers


Well, no heat is no heat coming threw. Did you burp the coolant system after heater core replacement? By warming the engine up with the radiator cap off so it can push the air out of the system? Then topping it off wile running before putting the cap back on?


Now as far as the blower motor, there not grounded that good in those, in mine, I had to run a separate ground wire to it, which took care of the problem. Otherwise the resistor yes, but make sure the blower motor is working. Run separate power & ground to it to test it.


My dad told ne to do that last night got sone heat back but when it blows itll blow light the stong on and off...thinking the resistor still for the blowing issue?


The resistor controls the blower motor function, speed, low to high, if that is working properly, I am miss reading your question. If you are talking about the temp. of the heat coming threw, have to get air out of system, the thermostat controls the temp. of the cooling system which = heat, and I see there is a heater control valve? Where is that located? This controls heat temp. also...worth looking into.


My truck dosnt have a control valve. I was told the blower motor resistor helps with heat that not true? Blen door motors working flapper goes up and is it possible the thermostats not functioning right?


How do i air out the system

1 out of 1 people think this is helpful.

The resistor helps with the heat in the fact that it controls the blower motor, that blows the heat into the cabin. Yes the thermostat regulates the cooling system to keep it around 195*. If the thermostat is stuck open or weak, your motor can't warm up to operating temp. there for no heat into the cabin. As far as bleeding, that was in my first answer.

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 55,947 nationwide Sierra 1500 listings starting at $2,400.


Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
Reputation 4,390
#2 John Saffrahn
John Saffrahn
Reputation 3,070
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,690
View All

Related Models For Sale

Used Ford F-150"
3,177 Great Deals out of 215,801 listings starting at $1,000
Used Dodge Ram 1500"
540 Great Deals out of 13,899 listings starting at $995
Used Toyota Tacoma"
637 Great Deals out of 30,001 listings starting at $2,850
Used Chevrolet Tahoe"
1,043 Great Deals out of 36,533 listings starting at $1,695
Used GMC Yukon"
547 Great Deals out of 14,666 listings starting at $1,500
Used GMC Sierra 2500"
212 listings starting at $4,999
Used Chevrolet Camaro"
812 Great Deals out of 39,041 listings starting at $2,650

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
18,768 listings starting at $20,851
2016 GMC Sierra 1500 For Sale
76 Great Deals out of 13,583 listings starting at $22,305
2015 GMC Sierra 1500 For Sale
187 Great Deals out of 4,750 listings starting at $15,995
2014 GMC Sierra 1500 For Sale
160 Great Deals out of 4,271 listings starting at $14,899
2013 GMC Sierra 1500 For Sale
85 Great Deals out of 2,639 listings starting at $12,400