1992 GMC Sonoma
2007-01-03 09:07:04 · 5 answers · asked by Eric S 1 in Cars & Transportation ➔ Car Makes ➔ GMC
3 things 1) the heater hose may be blocked, the bypass switch may be bad, or the vent may be stuck in the open position,
2007-01-03 09:16:17 · answer #1 · answered by Roll_Tide! 5 · 0⤊ 0⤋
You have to first determine if you are getting water flow through the core. Run motor till hot and just feel the two hoses under the hood. If they both feel about the same, you are not having as issue with the coolant flow or anything plumbing related. If it is something in this area, use a garden hose without the motor running and attempt to flow through the motor with the hose as the pump to find where it will not flow through and repair as necessary. I know this is pretty messy but it is very effective in finding a flow problem. If that is not the solution you have a control problem with the temp. door that can be as simple as someone dropping a pencil down the duct which jams the door. Access to this door and the controls for it is not simple. You have to start with vacuum supply to the control valve on the dash from the motor area. If it has all this, try to see the temp. door actuator and check for movement. If the actuator is moving, check to see if it is still connected to the door. If it is, you will have to get further into it as something might be blocking the cores air path. Did you replace the core on a whim hoping that was the problem or did someone replace it because it was leaking? If so, did someone forget to install everything or installed something wrong? More inspection and diagnosis required here. Good luck.
2007-01-04 08:23:05 · answer #2 · answered by Deano 7 · 0⤊ 0⤋
Additionally, geographically how has your weather been? If it's super cold out.. like 0 or below 0, the air is cooling the radiator to such a degree that you may have a difficult time actually getting warm air out of the heater core. I had the same problem with a 93 Silverado. If this is the case, you could do like the tractor trailers and put a cover over the front grill cutting off 2/3 to 3/4 of the air flow through which should provide you more heat. Good luck.
2007-01-04 03:13:43 · answer #3 · answered by limabee69 2 · 0⤊ 0⤋
IF...you already put in a new ( 192-195 ) thermostat and you are still cold....then check this out....when the engine runs and is at operating temp.....do the hoses ( heater ) feel hot when you wrap your bare fingers around them? If they do ...then the engine and all related pieces are working....NOW.....I think ? if it has a coupler coming off the intake or near there for a heater hose.......check that passage out real good and make sure....it's not plugged up with corroded metal from the fitting or any debris....pull 1 of the heater hoses off and start the sucker...see if you are getting " flow" thru the core. Hope I helped.
2007-01-03 13:45:27 · answer #4 · answered by Anonymous · 0⤊ 0⤋
You didn't say if it has air conditioner, but if it does, there is a vacuum operated switch (may be mechanical) that closes off hot water to the heat radiator since they share the same air box.
Follow the water hoses going to the heater " core" and look for this if you have air.
2007-01-03 20:10:42 · answer #5 · answered by Curious 4 · 0⤊ 0⤋