Well I have replaced the block coolant sensor, the fan relay and dunno what else to do. The fan still doesn't come on when I get the car nice and hot and I can't go far or it does overheat. I dunno what else to check.

Also a second minor problem. You know when you start your car the revs stay up then come down eventually to idle after warm up. Well my car does this right now while it is hot. I think the car thinks it is still cold and is therefore running rich.

If anyone can help PLEASE PLEASE HELP ME. Thax

------------------
1988 IROC-Z T-Top "MATTSTOY"
350 Crate engine
370ft. lb Torque STOCK
5speed Centerforce clutch, Spohn Sub-frames, Jamex 1.5 Lowering springs, 2 1/2' Exhaust,ram air setup

 

did ya check the fan motor?? that would prevent the fan from comming on too.

------------------
91 camaro RS
- 305 TBI
Mods: Performer TBI intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter, b+m trans cooler
Soon to come .SLP Posi 323,Spohn LCA's and panhard bar,Ascd ram air hood, Z28 spoiler and grille,white guage faces.

 

does the fan go on when you turn on the heat or ac?

 

did you check the fuse, fusible link, air dam, and also the coolant temp sensor has something to do with the fans, are you getting any codes???

 

Ok I have checked fan motor,relay,coolant block switch, coolant fan switch, the air dam is there, the computer throw's no codes and yet I idle 150-200rpms to fast and have no fan therefore over heat. WHAT IS GOING ON HERE??????

 

ANYONE?????/ HELP??????

 

mine overheats, i need to go buy an air dam, just too lazy, i hardly drive my car, one thing breaks after another


------------------
http://www.fbody.com/members/Camrs89/

 

AS Ron mentioned before, did you check the fusable link? Should be up by the battery, might be a fuse thinking about it, but it's kinda hidden, floow the wiring.

My guess if neither fan comes on, you either have no voltage, or no ground.

 

You need to start from square one. From under the car with the ignition on, ground the fan switch wire. If the one of the fans comes on, then that circuit is ok and it's most likely a gauge problem. If not, then you'll have to check all possible sources of discontinuity within the fan circuit.

The other fan is controlled by the ECM. From what you said about the idle, it is very possible that the ECM is not reading the coolant temp. correctly. You said you replaced the coolant temp sensor. Did you replace the one for the gauge or the ECM. The one for the ECM is located just above the water pump. Is it throwing codes? If you can get the computer on a diagnostic machine and see exactly what the computer is doing, that will should pinpoint the problem. Could very well be a bad ECM too.

As far as the high idle, if the fan problem is not related, then check the linkage to the throttle body. If that's ok, then use the procedure in Chilton manual on how to set the TPS and IAC.



------------------
89 Transam GTA, 350TPI, auto, 3.27 rear, dual cats, gray.
Magnaflow cat-back,
K&N open element,
Best E.T. 14.63@95mph

 

Did you check BOTH the coolant sensors? Sounds like the ECM isn't reading the right temp (no fan/high idle)