Having problems with your 1998 Chevrolet S-10 Pickup ?
Sometimes my 2003 S10 blows cold air out of the heater. At those times, I notice one of the heater hoses is cool while the other is hot. Suggestions?
Try backflushing the heater core - sometimes they plug up and will not allow the water to flow. You can go to an auto parts store and get a backflush kit which should include a backflush connector, clamps and an additive to put in your coolant system as well as directions to install connector. Pour additive into your radiator after you install the connector and use some vice grips to pinch off the heater hoses so you don't lose all of your coolant when you cut the hose to install the connector. Clamp off both hoses to prevent premature drainage and make sure you drain radiator and coolant system afterwards, adding the proper mix of antifreeze and water when you're done to prevent engine damage during a freeze.
Repair Help & Product Troubleshooting for 1998 Chevrolet S-10 Pickup
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.