Overheating???
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2nd Gear
Joined: Aug 2016
Posts: 84
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From: Las Vegas
Overheating???
Okay so my car began overheating today, but before we get to that. I already replaced the thermostat with housing and gasket (preventative maintenance), an aluminum coolant tank (previous was leaking a tad). I check my fluids everytime I need gas. Today I was at half a tank of gas and overheated. Coolant was low.
What could it be on these cars given everything I’ve replaced already? Water pump?
Thanks for any insight.
What could it be on these cars given everything I’ve replaced already? Water pump?
Thanks for any insight.
6th Gear - An Official NAM Greeter
Joined: Mar 2016
Posts: 2,990
Likes: 331
From: Southern oregon
Okay so my car began overheating today, but before we get to that. I already replaced the thermostat with housing and gasket (preventative maintenance), an aluminum coolant tank (previous was leaking a tad). I check my fluids everytime I need gas. Today I was at half a tank of gas and overheated. Coolant was low.
What could it be on these cars given everything I’ve replaced already? Water pump?
Thanks for any insight.
What could it be on these cars given everything I’ve replaced already? Water pump?
Thanks for any insight.
In the hot weather, you need the two speed fan to operate on both speeds and VERY often the slow speed goes out.
Are you losing coolant at the cap?
Some of these expensive replacement aluminum tanks use the same plastic cap as the OE plastic tank. If so, that OE cap is a part with a moderate failure rate, possibly higher than the tank itself.
If it’s not holding pressure, you’ll spew coolant and overheat.
Some of these expensive replacement aluminum tanks use the same plastic cap as the OE plastic tank. If so, that OE cap is a part with a moderate failure rate, possibly higher than the tank itself.
If it’s not holding pressure, you’ll spew coolant and overheat.
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2nd Gear
Joined: Aug 2016
Posts: 84
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From: Las Vegas
Are you losing coolant at the cap?
Some of these expensive replacement aluminum tanks use the same plastic cap as the OE plastic tank. If so, that OE cap is a part with a moderate failure rate, possibly higher than the tank itself.
If it’s not holding pressure, you’ll spew coolant and overheat.
Some of these expensive replacement aluminum tanks use the same plastic cap as the OE plastic tank. If so, that OE cap is a part with a moderate failure rate, possibly higher than the tank itself.
If it’s not holding pressure, you’ll spew coolant and overheat.
2nd Gear
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6th Gear
Joined: Jun 2014
Posts: 2,252
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From: Dover, PA
First have your Coolant Fans checked... the Number 1 reason for over heating (IMO) I have found more Fan Resisters going bad then any other reason for over heating.
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
5th Gear
Joined: Oct 2016
Posts: 985
Likes: 97
From: Atlanta Georgia
It's evident you are not spitting fluid from the cap or tank, no Splatter..
These cars are very finicky when it comes to air being in the system, make sure you have bled the system properly and have not put too much coolant in the reservoir.
I would get a block tester and see if there are exhaust gases in the cooling system which would indicate a bad head gasket. I would also do a pressure test to see if the system is holding pressure.
Are your low/high speed fans coming on?
These cars are very finicky when it comes to air being in the system, make sure you have bled the system properly and have not put too much coolant in the reservoir.
I would get a block tester and see if there are exhaust gases in the cooling system which would indicate a bad head gasket. I would also do a pressure test to see if the system is holding pressure.
Are your low/high speed fans coming on?
Neutral
Joined: Aug 2016
Posts: 4
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From: CT
First have your Coolant Fans checked... the Number 1 reason for over heating (IMO) I have found more Fan Resisters going bad then any other reason for over heating.
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
I had overheated in the middle of a hot day in completely stopped traffic and I had checked and my reservoir was empty and the engine bay was all wet - from what I've heard though, it's not abnormal to boil over even with a good cap (right?).
After refilling and bleeding and finding no leaks or losing coolant, I tested the fan via this video (
What I don't get though is that everywhere I see mentions the resistor in the fan which commonly dies, killing the low speed fan, but my low speed fan does seem to be working. I also couldn't find any 2002/2003 wiring diagrams either to find more information on how they differ from 2004+ because I know minimally they don't share the same stage 2 relay.
Any thoughts on what I should be replacing to fix the high speed fan?
4th Gear
Joined: Mar 2016
Posts: 470
Likes: 100
From: SF Bay Area - Nor Cal
A replacement fan unit for the ‘02 R53 is about $85 on Amazon.
We replaced the one on ours about a year ago with the TYC branded one from Amazon and it’s been working just fine The old fan lost the low speed, but high speed was still working.
Now low speed comes on right away (along with the power steering fan) as soon as the A/C is switched on. I don’t hear high speed as much anymore after changing out the thermostat, but I know it’s working as well.
Check to make sure your power steering fan is also coming on when A/C is switched on. I believe the fans are somehow on the same circuit.
A replacement fan unit for the ‘02 R53 is about $85 on Amazon.
We replaced the one on ours about a year ago with the TYC branded one from Amazon and it’s been working just fine The old fan lost the low speed, but high speed was still working.
Now low speed comes on right away (along with the power steering fan) as soon as the A/C is switched on. I don’t hear high speed as much anymore after changing out the thermostat, but I know it’s working as well.
Check to make sure your power steering fan is also coming on when A/C is switched on. I believe the fans are somehow on the same circuit.
Be sure to check the fuse too. I can't remember which one it is.
My ac compressor died because I drove to long without the fan working so I would install the new radiator as soon as possible
1st Gear
Joined: Aug 2013
Posts: 26
Likes: 1
First have your Coolant Fans checked... the Number 1 reason for over heating (IMO) I have found more Fan Resisters going bad then any other reason for over heating.
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
Several ways to check the Resistor Kit is about $50. compared to a complete fan kit at about $300.
More often than you think it is the resistor pack that dies and the high speed fan stops working.
Best of luck resolving it.
Motor On!
My electric fan stopped and thankfully I wasn't driving it much before it was diagnosed. Could have overheated and caused real damage.
Car has been traded in as of yesterday though
! Tranny was going.
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