91z07

At engine start-up my cooling fan comes almost immediately and the service engine soon light comes on until the engine warms up to normal running temperature. The ALDL indicates low coolant temperature (no duh, the coolant temperature is always low at cold starts). I figure this is not good to have the fans running while the engine is trying to warm up. Any ideas?

KYVette90

Check your coolant temp sensor and the fan relays.

flyersfan1088

My fans have always come on at start-up. No codes though.

USAsOnlyWay

On my 86 the fan starts up right away too. I talked to somebody I met on here about it though and he said that sometimes you have the dual fans and one of them is set to come on. Supposedly on the left side of the engine there is a connector sticking out that if you have two, it will have a wire coming from it running to the radiator area. I had it, and since all works fine I assumed it was just that. Just an idea, sorry I couldn't help more...

Here is a pic:
http://www.geocities.com/numbar2/fan.jpg

Also, that is not my car, god I wish it was!!!!!

dlmeyers

Understand you are getting a Code 15, Engine Coolant Temperature-Low Temp Indicated. This could be sensing a temp below -30C.

Assuming you are getting a Code 15, check the connections at the engine coolant temp sensor and all associated wiring. If all is OK, suspect you have a bad temp sensor or the ECM may be heading south.

The GM ECT sensors are around $10.

Let us know.

dlmeyers 90 coupe zf6 3 speed shocks

ittlfly

If the wiring is ok, then the CTS resistance is probably to high (cold engine) and setting code 15. Replace the CTS. If that doesn't clear up the problem the the ECM may be having problems.

oldace84

Check your fan switch....the one on the fenderwell on the drivers side.....this happened to me...after replacing this switch...everything was A-OK......
TONY
:thumbs:

91z07

Thanks for the help, guy's. I put in a new temp. sensor and I don't get the SES light anymore. :D

ELEVENS

The factory programmed one of my 90's fans to come on at startup if the A/C (or defroster) is on. If A/C is off, then the fan doesn't come on until the coolant reaches the pre-set temp.

Maybe your's is that way too?

:cheers:


[Modified by ELEVENS, 4:15 PM 2/11/2003]

91z07

My fans come on at start-up whether the a/c is on or not. -- Nice TPIS set-up. What are your thoughts on your mini-ram? Would you recommend one? I'd like to talk to someone running one. I'm new to the forum and have seen accel recommended mostly. THANKS!!

ELEVENS

The SR or LTRs with a stroker motor IMHO has too much torque for the street- a waste - I never could get 1/2 of that power to the road - even with 315 Michelin Pilot Sports. I couldn't go full throttlel until 1/2 way through 2nd gear. Would make a great truck motor for towing, though (Oh, my - now THAT'S going to ruffle a few feathers...) On the track with slicks it was awesome, but no match for the MR, at least in theory.

The MR just loves to wind waaay up there! It's a blast - I love it. Neat, clean, and one piece - makes teardowns a snap.