Car is getting hot...fans only come on in low speed
06-17-2010, 09:54 AM
#1
Drifting
Thread Starter
Car is getting hot...fans only come on in low speed
I remember when my fans would come on and stay on in high speed when I parked my car. Now they only come on in low speed, never in high, even if it gets up to the second white line. Is this because I changed the relay? All fuses are fine, could it be the thermo switch? I don't have A/C and it has been getting warmer than usual, what could it be?
06-17-2010, 10:39 AM
#3
Drifting
Thread Starter
The A/C doesn't work, it blows air from outside, don't know if the electrical is working, my tehc said he can jumper the line so that it can run in high speed instead of low...
06-17-2010, 10:44 AM
#4
Nordschleife Master
How is "hot" being measured? Is the tech trusting the gauge in the dash, or using actual measurement of the coolant either at the radiator, coolant neck, hose, or another point?
The in dash gauge is fickle, as are the sensors and wiring.. is it possible you are not hitting the point at which the high speed is supposed to come on?
FWIW, my turbo car will hit high-speed sitting still, but my N/A rarely makes it above the low side mark on the gauge, but will hit high speed on the fan if driven hard on a hot day!
As an aside, I notice a lot of people referring to their mechanics, but very few ever refer to their technicians... aside over!
The in dash gauge is fickle, as are the sensors and wiring.. is it possible you are not hitting the point at which the high speed is supposed to come on?
FWIW, my turbo car will hit high-speed sitting still, but my N/A rarely makes it above the low side mark on the gauge, but will hit high speed on the fan if driven hard on a hot day!
As an aside, I notice a lot of people referring to their mechanics, but very few ever refer to their technicians... aside over!
06-17-2010, 10:57 AM
#6
Drifting
Thread Starter
06-17-2010, 11:02 AM
#7
Drifting
Thread Starter
How is "hot" being measured? Is the tech trusting the gauge in the dash, or using actual measurement of the coolant either at the radiator, coolant neck, hose, or another point?
The in dash gauge is fickle, as are the sensors and wiring.. is it possible you are not hitting the point at which the high speed is supposed to come on?
FWIW, my turbo car will hit high-speed sitting still, but my N/A rarely makes it above the low side mark on the gauge, but will hit high speed on the fan if driven hard on a hot day!
As an aside, I notice a lot of people referring to their mechanics, but very few ever refer to their technicians... aside over!
The in dash gauge is fickle, as are the sensors and wiring.. is it possible you are not hitting the point at which the high speed is supposed to come on?
FWIW, my turbo car will hit high-speed sitting still, but my N/A rarely makes it above the low side mark on the gauge, but will hit high speed on the fan if driven hard on a hot day!
As an aside, I notice a lot of people referring to their mechanics, but very few ever refer to their technicians... aside over!
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06-17-2010, 11:13 AM
#8
Nordschleife Master
Brain says, wire harness and relays are YUMMY..
You either have a bad thermo switch (I thought you said you had a new one), a bad relay ($$), or wiring issues.
IF you have replaced the thermo switch with the proper temp one, and you replace your relay and it still isn't working your harness needs some healing.
teh fans should BOTH be spinning when the snowflake switch is pressed, if they are not it points to a faulty switch, HVAC control head, or again wiring harness issues.
get the gremlins run out of town, or they are going to haunt you for a long time to come!
You either have a bad thermo switch (I thought you said you had a new one), a bad relay ($$), or wiring issues.
IF you have replaced the thermo switch with the proper temp one, and you replace your relay and it still isn't working your harness needs some healing.
teh fans should BOTH be spinning when the snowflake switch is pressed, if they are not it points to a faulty switch, HVAC control head, or again wiring harness issues.
get the gremlins run out of town, or they are going to haunt you for a long time to come!
06-17-2010, 11:15 AM
#9
Nordschleife Master
Don't trust the gauge, get an IR thermometer (or have the tech get one) and trust it's readings, the gauge in the factory instrument cluster is about as far as you can get from accurate while still having a gauge!
06-17-2010, 11:27 AM
#11
Nordschleife Master
More info can be found here... forgot to mention the resistors and wiring on teh firewall, check the resistors and the resistor wiring for condition..
http://www.clarks-garage.com/shop-manual/cool-01.htm
http://www.clarks-garage.com/shop-manual/cool-01.htm
06-17-2010, 11:30 AM
#12
Drifting
Thread Starter
Just remembered
I just remembered that a few weeks ago, the bulb in my glove compartment went out and along with it my digital clock stopped working, does this have anything to do with the wiring for the A/C button or why it wouldn't work if I press it???
06-17-2010, 11:32 AM
#13
Nordschleife Master
Good info in this thread for troubleshooting.. it is an old thread though!
https://rennlist.com/forums/944-turb...ow-speeds.html
https://rennlist.com/forums/944-turb...ow-speeds.html
06-17-2010, 11:35 AM
#14
Nordschleife Master
BTW I bet your dome lights and cig lighter dont work eiter (both my cars have all teh accessories on the same fuse... check fuse #11)