Help ! Car over heating
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Teching In
Joined: May 2013
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Help ! Car over heating 
My car overheats in slow traffic, or when its not moving. Turning the A/C makes it worse and the oil pressure drops a bit. Only when I rev it does it cool down a bit. yesterday on the fourth it nearly shut down in traffic ! any help, or diognostics would help. Thank you. My car overheats in slow traffic, or when its not moving. Turning the A/C makes it worse and the oil pressure drops a bit. Only when I rev it does it cool down a bit. yesterday on the fourth it nearly shut down in traffic ! any help, or diognostics would help. Thank you.The fans are EVERYTHING during slow driving or in stop and go traffic. First make sure your fans are BOTH working. They should BOTH be on at the same time or OFF at the same time. Next time you get hot pull over and leave the engine running..A/C OFF..pop the hood and go see if your fans are running. Just out your hand carefully behind each fan to feel the blast of air. If they're not BOTH running check the relays in the fuse box in the engine compartment. Just swap the ignition relay with each fan relay.....see if the fans work.
Other issue that people have with overheating, especially after putting the A/C on......very dirty condenser. The outside front surface area gets jammed up and clogged with debris over time. It kills the efficiency and makes the condensor very hot. Then the radiator can't cool the coolant as well and you run hot. Once that t-stat is bathing in coolant that's above the temp rating of the t-stat, it will never fully close and the coolant just keeps getting hotter and hotter. Then you overheat.....
.
Debris in the condenser and the radiator is what I'd
get after, first - it's a freebie and costs you only some
minor disassembly and time with the garden hose. I
got quite a bit out of mine last time and it was a big
difference in ability to hold coolant temp when the
A/C was on.
You want your fans set lower than stock, down to
where they are ahead of, not way behind, thermostat
crackpoint. I like low speed a couple of degrees below
and high speed, a couple above where I see the ECT
sit on highway cruising (184F).
The thicker LT1 radiator helps a bunch too, if it's time
to replace or hygeine and settings don't suffice.
get after, first - it's a freebie and costs you only some
minor disassembly and time with the garden hose. I
got quite a bit out of mine last time and it was a big
difference in ability to hold coolant temp when the
A/C was on.
You want your fans set lower than stock, down to
where they are ahead of, not way behind, thermostat
crackpoint. I like low speed a couple of degrees below
and high speed, a couple above where I see the ECT
sit on highway cruising (184F).
The thicker LT1 radiator helps a bunch too, if it's time
to replace or hygeine and settings don't suffice.
All great advice but the thing about the temperature going down when the car revs is odd.
Just to confirm - Is this a 4th gen F-Body or some other type of car?
Have you checked the coolant level in the overflow bottle and at the radiator cap when the car is cold? (That would be a really good thing to do first off.)
Just to confirm - Is this a 4th gen F-Body or some other type of car?
Have you checked the coolant level in the overflow bottle and at the radiator cap when the car is cold? (That would be a really good thing to do first off.)
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