Radiator fan does not turn on

HBONILLA

MEMBER
1986 HONDA CRX
1.5L
4 CYL
2WD
MANUAL
245,000 MILES

Already checked radiator fan relay, okay, replaced thermosensor above oil filter, okay, noticed when I ground blue wire from relay, radiator fan turns on. Any idea? There is a sensor on the bottom of the radiator is that part of the radiator fan system? Please advice. Thank you.

4 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

The blue goes to the radiator fan timer on the top of left kick panel. It provides a ground path to the radiator fan relay control side of the relay (electromagnet that pulls the switch closed when energized), and pulls switch closed, completing the circuit to the fan motor providing battery voltage so it runs. Therefore the problem is going to be with the fan timer. In the diagrams down below I have included a exploded view of your vehicle's cooling system, along with wiring diagrams and fluid charts for you. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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Sunday, April 28th, 2019 AT 8:49 PM

HBONILLA

MEMBER
3 POSTS

Mr Alex, thank you for you're support. It has been so hard to find answers or solutions to this problem. I really appreciate you're time and help, this is a great day.

Thank you a lot.

Will keep you posted.

Herbert Bonilla.

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Monday, April 29th, 2019 AT 8:15 AM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

You are welcome, SCWICKEDSTANG is one of our newest experts, he is quickly shaping up to be one of our best! Please let us know what you find. We are interested to see what it is.

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Wednesday, May 1st, 2019 AT 1:08 PM

HBONILLA