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Loosing coolant in my 98 plymouth neon. Radiator and thermostat is new. Hoses look good. Hissing coming from housing where thermostat is and maybe a little bit of a leak from the bottom there. Today the car was blowing cool air which turned to hot but then went cool again. Gage stayed in the normal range but was a bit higher than usual.

Answers from the Automotive Experts

Amanda J. Pierce, MBA Lisa, You may have had your thermostat housing gasket double gasketed, improperly sealed, or the housing bolts may not have been torqued to specifications. I would definitely check those specs and the condition of the housing. You may be experiencing burst of cold air due to the fact that it is escaping before full circulation through out the heater core. Do note, that head gaskets are known to be a notorious issue with these models.

Barb Petrey, President - DBK Enterprises Inc at Jiffy Lube Top off coolant and the heat will come back. Should have it presure tested to see if there is any other leaks

Bogi Lateiner, Owner and Technician at 180 Degrees Automotive Hi Lisa - Sounds like you already have the answer. The hissing you are hearing is because of the leak and the heat that comes and goes is because you are low on coolant. You can top it off for now (remember to only check and fill the cooling system when it*s cold) and than bring it back to the place that did the thermostat when you can. Good luck! Bogi Lateiner

Judy Curry, Co-Founder and Vice President of Marketing at Currys Auto Service Lisa, I just spoke to one of our techs. Seems like you've got a leak that needs some immediate attention. The hissing noise is air escaping the cooling system and the location of a leak. The cooling system is low and the engine is starting to overheat. The temperature gauge cannot read actual coolant temperature unless it has coolant on it, with the system so low it will give a false reading. Your heat coming and going is also a sign of the coolant being low in the system. You need to have the system pressure tested and repaired asap. Driving the car will potentially damage the engine. please feel free to contact us if you have any more questions. If you're in our area you can call 703-502-0400, or 8-888currys. Thanks and good luck!

Laurie Sarno, Co-Owner at Super Girls Auto Hello Lisa- I would replace the water outlet & gasket the sometimes warp - hopefully this fixes your problem - thanks Super Girls Auto.

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