I have a 1993 Pontiac Grand AM. I had heat before I replaced the thermastat and heater core, but it only blows cold air now. Is it possible to have air inside the flow lines or core itself??
2006-10-20 12:11:13 · 12 answers · asked by Jimmie M 1 in Cars & Transportation ➔ Car Makes ➔ Pontiac
did you put the thermostat in correctly? did you connect the hoses correctly? did you fill the cooling system with coolant? did you put coolant in overflow tank? air in the system will come out by itself but you have to keep an eye on the over flow tank to make sure that is doesn't get sucked dry. what happened to me is that i hooked up the heat/cool dampers wrong and the heater was blowing cold air.
2006-10-20 12:21:39 · answer #1 · answered by oldguy 6 · 2⤊ 0⤋
Yes and the car engine will overheat if you drive it try jacking up the front end or drive up on ramps and slowly fill the radiator at the cap engine off. remove one heater hose slightly at the fire wall carefully not to damage the new copper pipe to burp out air. Then continue to add coolant until you cannot put any more in. Put the cap back on start the car turn on heat all the way. It takes about 20 to 30 minutes to circulate the antifreeze enough to clear the air out of the heater core so keep coolant mix handy to add to the recovery bottle each time the car cools down some more coolant will be sucked back into the engine and heater core.
2006-10-20 12:21:50 · answer #2 · answered by John Paul 7 · 0⤊ 0⤋
Those are notorious for air locks. Did you bleed the system using the bleeder valves on the thermostat housing and the bypass hose?
Here's how I did these. LET THE CAR COOL DOWN BEFORE DOING THIS!
Fill the radiator and reservoir about 80% full leave the cap off and start the vehicle. Let it run for a while (it takes about 15 Min) til you can see the coolant flowing and the temp gauge rise. If yours fills through the coolant reservoir watch to see that the level in th reservoir drops. slowly add coolant as the car is running (DONT BURN YOURSELF) You need to get the car to 192 degrees to ensure that the thermostat is open to let all the air out. when you get a rush of bubbles and overflow out of the radiator (or reservoir) the air is being pushed out, once the "overflow" calms down, top it off, install the cap and you should be good to go. The next day after it cools completely, recheck and top off the coolant if necessary.
Hope this helps!
2006-10-20 12:23:33 · answer #3 · answered by konstipashen 5 · 1⤊ 0⤋
There's a chance you hooked the two water hoses up backwards or could also be that the cable that controls the water flow into the heater core didn't get reconnected. Could also be that you installed the thermostat backwards with the spring facing up, rather than down. Sounds dumb, but I did the same thing myself a few years back. Man, was I P.O.'d! If you're lucky, it's the thermostat, it's the easiest to fix.
2016-05-22 06:06:33 · answer #4 · answered by ? 4 · 0⤊ 0⤋
The other answers may be good But as a mechanic I must say NOT
First feel the heater hoses going into the dash and see if it is hot.
Then feel the one comming out of the firewall. If thy are both hot then the heater controll is not working.
If it is ok then the heater controll valve is not allowing the water to go into the heater core.
If neather hose is hote, then the hose is stopted up.
If you put the thermostate in upside down it would still work as it is the water temp that opens the thermostate.
Also check to be shure after the car has fully warmed up and the water is full.
2006-10-20 12:54:21 · answer #5 · answered by goldwing127959 6 · 0⤊ 1⤋
One of two things, the thermostat is in backwards, or the new core is full of air. Before checking the thermostat get under the hood and disconnect both heater hoses, in and out, use a garden hose to force water through the core. This should fix the problem, if not, it's your thermostat.
2006-10-20 12:29:56 · answer #6 · answered by Anonymous · 1⤊ 0⤋
Yup, run for a while and recheck your coolant level, air pockets take time to work out. You might have damaged or disconnected your heater control valve also, it control coolant flow to the heater core. Run car with heater on high and keep adding coolant till it overflows, and see if you have a bleeder screw on the radiator or somewhere inline with the coolant lines.
2006-10-20 12:16:07 · answer #7 · answered by ? 3 · 1⤊ 0⤋
You put the thermostat in upside down or you purchased a 165 degree thermostat. Also make sure you reconnected the vacuum line to the heater hose line valve so it can open and close.
2006-10-20 12:15:10 · answer #8 · answered by Anonymous · 1⤊ 1⤋
everyone seems to be on the right track with their answers however make sure antifreeze has the correct mixture of water and antifreeze too much antifreeze would make it blow cold air 50/50 most common.
2006-10-20 17:46:31 · answer #9 · answered by Anonymous · 0⤊ 0⤋
just my 2 cents, but if the thermostat is in backwards, the car will overheat, which is not a symptom he has mentioned (If it was overheating, I think he would have noticed by now) Probably airlocked, bleed as recommended by others, should fix your problem.
2006-10-20 12:48:54 · answer #10 · answered by unclejimthebear 3 · 1⤊ 0⤋