Over heating

Tiny
MSAMGAB
  • 1997 PONTIAC TRANSPORT
  • FWD
  • 118,000 MILES

If the heater core is clogged can this cause the car to over heat

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Saturday, December 17th, 2011 AT 2:22 AM

43 Replies

Tiny
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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?

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Saturday, December 17th, 2011 AT 2:27 AM
Tiny
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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

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Saturday, December 17th, 2011 AT 4:25 AM
Tiny
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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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Saturday, December 17th, 2011 AT 4:36 AM
Tiny
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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?

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Saturday, December 17th, 2011 AT 3:41 PM
Tiny
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Yes they both are getting hot, the fans coming on past 220 before the red mark

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Saturday, December 17th, 2011 AT 8:08 PM
Tiny
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That sounds right for the fan. How hot does it get?WHy do you think its overheating?

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Sunday, December 18th, 2011 AT 3:59 AM
Tiny
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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

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Sunday, December 18th, 2011 AT 4:18 AM
Tiny
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220 isnt super hot have you checked your radiator fins for sand animal fur bags etc?

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Sunday, December 18th, 2011 AT 5:29 AM
Tiny
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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

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Sunday, December 18th, 2011 AT 8:57 PM
Tiny
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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?

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Sunday, December 18th, 2011 AT 9:34 PM
Tiny
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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.

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Thursday, December 22nd, 2011 AT 11:31 PM
Tiny
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So are both upper and lower radiator hoses getting really hot?ALso you said you changed the coolant temp sensor?

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Friday, December 23rd, 2011 AT 12:49 AM
Tiny
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And also changed the coolant temp sensor, so whats causing it to still over heat

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Friday, December 23rd, 2011 AT 1:41 AM
Tiny
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What color were the wires going to the sensor you changed?

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Friday, December 23rd, 2011 AT 1:50 AM
Tiny
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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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Friday, December 23rd, 2011 AT 2:15 AM
Tiny
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3 wires black, yellow, green that go to the coolant temp sensor

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Friday, December 23rd, 2011 AT 3:59 AM
Tiny
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The 30 amp maxi fuse fan #1 is good, where do I connect the jumper wire to and from

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Friday, December 23rd, 2011 AT 4:36 AM
Tiny
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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.

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Friday, December 23rd, 2011 AT 4:58 AM
Tiny
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There are lots of dark green wires it dont show which one goes to the relay

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Friday, December 23rd, 2011 AT 9:15 PM
Tiny
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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?

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Saturday, December 24th, 2011 AT 3:01 AM

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