ENGINE OVERHEATING

1997 Cadillac SLS

Tiny

tinman268

July, 23, 2011 AT 11:21 PM

My 1997 cadillac sls 4.6L northstar has been overheating. I've replaced the t-stat, fan relays, flushed the system and refilled with the sealant pellets as required, and changed the ECT. Also as an HVAC service tech I've tested every circuit of the cooling system. Both fans are not coming on all the time when the a/c is running. Which leads me to believe a possible PCM problem. Such as not completing the circuit to make both fans run. They do run if the a/c is set to come on when the engine is first started, but when you turn the a/c off then back on only the driver's side fan runs. HELP! This is driving me crazy.

FOUND 12909 RELATED QUESTIONS

4 Answers

Tiny

rasmataz

July, 23, 2011 AT 11:24 PM

Reading it sounds like the PCM

Tiny

cadieman

July, 24, 2011 AT 1:06 AM

Ck. The codes and troubleshoot by codes set.

Tiny

tinman268

July, 24, 2011 AT 2:31 PM

It's not throwing any codes codes other than an overtemp code. I am going to bypass the PCM with a switch circuit to allow the relay to switch the fan current.

Tiny

cadieman

August, 8, 2012 AT 1:55 AM

Are u receving power to the inop. Fan relay?

Please login or register to post a reply.

Thermostat Replacement Chrysler PT Cruiser
Thermostat Replacement Mercedes Benz C230
Radiator Replacement Mercedes Benz ML 500
Radiator Replacement Kia Sportage