if the heater core is clogged can this cause the car to over heat
Dec 17, 2011 at 2:22 AM
over heating
1997 PONTIAC TRANSPORT
MSAMGAB
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With just the heater core clogged up i couldnt see that making it overheat.Did you add any stop leak to the coolant?ALso is the radiator fan and thermostat working ok?
Dec 17, 2011 at 2:27 AM
yes i add stop leak to the coolant in the summer time but it never over heated until now, yes the radiator fan is working, thermostat is new, the heater is working
Dec 17, 2011 at 4:25 AM
yes i add stop leak to the coolant in the summer time but it never over heated until now, yes the radiator fan is working, the thermostat is new
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Dec 17, 2011 at 4:36 AM
Stop leak can clog the radiator heater core etc.Are both the upper and lower radiator hoses getting really hot?Also what actual temp is the fan coming on at?
Dec 17, 2011 at 3:41 PM
yes they both are getting hot, the fans coming on past 220 before the red mark
Dec 17, 2011 at 8:08 PM
That sounds right for the fan.How hot does it get?WHy do you think its overheating?
Dec 18, 2011 at 3:59 AM
because it stays past 210 it never did that before it allways stay at around 180 to 195 then it would go to 210 fan goes on then back to normal temp 180 to 195
Dec 18, 2011 at 4:18 AM
220 isnt super hot have you checked your radiator fins for sand animal fur bags etc?
Dec 18, 2011 at 5:29 AM
i check the upper and lower hoses agian, the upper hose that goes to the thermostat gets hot, now i felt that the lower hose half of it is cold the lower bottom part of it that connects to radiator and the other half is hot that connects to the water pump housing whats the cause of this
Dec 18, 2011 at 8:57 PM
If both hoses arent getting hot then the coolant isnt circulating.Are you sure the thermostat is good?Also how hot was the coolant temp when you check the hoses?
Dec 18, 2011 at 9:34 PM
ok radiator, hoses, thermostat, heater, fans are working but it still over heating to 230 to 240 fan goes on temp goes down to 210 then when fans off temp goes back up to 230 to 240 what else causing it to over heat.
Dec 22, 2011 at 11:31 PM
So are both upper and lower radiator hoses getting really hot?ALso you said you changed the coolant temp sensor?
Dec 23, 2011 at 12:49 AM
and also changed the coolant temp sensor, so whats causing it to still over heat
Dec 23, 2011 at 1:41 AM
What color were the wires going to the sensor you changed?
Dec 23, 2011 at 1:50 AM
See if the green 30 amp maxi fuse labeled cooling fan one is good make sure there is power to both sides of it.If its good then jumper a ground to the dark green wire going into the under hood fuse box.As you can see its the low speed ground trigger for your cooling fan.The cooling fan number one should turn on.I think what happened is you lost your low speed cooling fan which would come on at about 210ish to 220ish then your high speed would kick on at the 230 degree.Let me know what you find.
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Dec 23, 2011 at 2:15 AM
3 wires black, yellow, green that go to the coolant temp sensor
Dec 23, 2011 at 3:59 AM
the 30 amp maxi fuse fan #1 is good, where do i connect the jumper wire to and from
Dec 23, 2011 at 4:36 AM
One side of the jumper to the negative battery cable and the other end you will have to ground the dark green going to the under hood junction box that is the ground trigger for the low speed fan relay.Like i showed you in the diagram i posted.
Dec 23, 2011 at 4:58 AM
there are lots of dark green wires it dont show which one goes to the relay
Dec 23, 2011 at 9:15 PM
Look on the relay it should show a diagram on the top of the relay showing how the circuit runs to the pins of the relay.Does your relay show that?
Dec 24, 2011 at 3:01 AM
ok low speed on fan 1 running what shoud i check next
Dec 26, 2011 at 7:40 PM
Alright so where did you ground it to get the low speed fan to turn on?
Dec 26, 2011 at 8:34 PM
to neg from the battery
Dec 26, 2011 at 9:43 PM
Alright from the negative of the battery to where in the circuit of the ground trigger to the relay?Iam not there see what your doing so i need good details.
Dec 26, 2011 at 9:49 PM
fan 1 relay diagram is number this way top left to right 85 - 87, left to rigth bottom 86 - 30, know the pins are in this order top left to rigth pins 30 - 86, bottom left to rigth pins 85 - 87, when i touch pin 86 it spark, when i touch pin 85 relay click and fan 1 turn on is this correct.
Dec 27, 2011 at 4:26 PM
Alright if the low speed fan is coming on when you ground the trigger pin of the low speed fan relay then heres what you need to do next.Unplug the ecm then ground the harness terminal going to the ground trigger of the low speed fan relay and see if that fan comes on?
Dec 27, 2011 at 7:22 PM
connect a wire going to the neg battery terminal and the other end to the fan 1 harness terminal ground wire
Dec 27, 2011 at 10:20 PM
Unplug the ecm and ground the wire on the ecm harness that goes to the low speed relay trigger see if the fan comes on.This will tell us if all the wiring from the ecm to the relay are good.
Dec 28, 2011 at 12:56 AM
Disconnected the fan #1, ok touch pin #85 fan 1 relay then touch one wire on harness relay clicks -- again touch pin #85 fan 1 relay then try both wires that come from fan 1 nothing happens.
Dec 28, 2011 at 2:58 PM
Are you unpluging the relay?Or the ecm the vechiles computer like i asked and then grounding the ground trigger to the low speed fan relay?So when can narrow the problem down to a wire terminal tightness or ecm.
Dec 28, 2011 at 4:55 PM
am not understanding something here unplug the ecm fuse correct, then run a wire to the neg terminal battery and the other end to the fan relay 1
Dec 29, 2011 at 12:05 AM
Unplug the ecm computer the computer that runs your car the harness going to it.Then at the harness you unplugged ground the low speed ground trigger wire at the harness you unplugged to see if the low speed fan comes on.
Dec 29, 2011 at 2:02 AM
am not an expert here help me out step 1 where is the ecm, is the ecm a fuse, the harness from where there are wires coming out from the junction box
Dec 29, 2011 at 3:33 AM
where is ecm located
Dec 30, 2011 at 1:07 AM
Its secured in the air cleaner assembly left front of vechile its the computer for powertrain.Unplug it and then ground on the harness side you plugged the ground trigger for the low speed cooling fan and see if the fan turns on.
Dec 30, 2011 at 2:38 AM
Lets go back to the beginning, the car started to overheat: before i changed the intake manifold gaskets, the thermostat, oil, coolant temperature sensor and antifreeze. :::: Also i turn the car on today checked the lower hose again and half of it was cold again.
Dec 31, 2011 at 11:48 PM
Alright well we were trying to figure out why the low speed was inop and only your high speed fan comes on at 230 degrees.Both the upper and lower radiator hoses are supposed toget really hot if there not you dont have coolant flow thru your engine.
Dec 31, 2011 at 11:55 PM
ok would it be the thermostat or the water pump thats makeing the lower half hose to be cold.
Jan 1, 2012 at 1:28 AM
Yeah it would be or blockage we still have to figure out why the low speed fan is inop also.
Jan 1, 2012 at 1:39 AM
ok loging out for now; happy new years day
Jan 1, 2012 at 2:48 AM
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