Lemken

We have a 2002 Chevy Venture which we have a cooling problem with, appears to be related with the fans need to keep the AC cranked in order for the fans to come on and cool the engine, fans do not appear to come on any other time after spending $1,400. our mechanic still did not resolve the problem. Compressor was replaced and one of the fan relays were replaced as well, vehicle will not start after running for approx 30 min to 1 hr without letting it set to cool for about 30 min. Temp guage does not indicate over heating...

Any suggestions would be greatly appreciated...

Thanks..

GregA

Hi Lemken - Welcome to the forum!

$1,400 - Wow. I hope that was not just to get the fans running.

I have a page here that shows how the cooling system fans work. What I would do is replace ALL THREE relays and see what happens. Or you could troubleshoot to find out exactly what is wrong. There could be a loose or dirty connection to one of the relays.

Take Care,

__________________
Greg A.
2001 Chevy Venture w/some "enhancements" ~ 94K Miles (Dec. 2009)
1992 Jeep Cherokee Laredo, 4.0L, Automatic ~ 144K Miles (Dec 2009)

Lemken

Thanks I will try that...Frank

gary 291

my son has a 2002 chev venture van had problem with cooling fans not coming on it was a wire broken at the computer now the engine light does not stay on all the time hope this helps

gary 291

<P>forgot to say dark blue wire runs high speed fan dark green wire runs low speed fan so if&nbsp; they are dirty or broken they wont come on computer</P>
<P>is located under hood on drivers side fender</P>
<P>&nbsp;</P>

merc81

good info GregA. I think the important point to make about the fans is the way the do high and low speed.

From GregA's circuit posting, you can see that the low speed setting has the fans running in series mode--that is the power runs through one fan and then on through the other fan. Should there be a wiring problem with either fan motor, low speed is not going to work at all.

In high speed mode, the fans run independently from each other, but high speed mode is not often called for as the temps need to get beyond 230 or so.

You can test the fan circuits manually by removing the pcm and grounding pins 5 or 6 by using a jumper on the connector pins.
If high speed works on one fan only but there is no low speed you have a bad fan motor or wiring to that motor.